Endpoint Protection

Microsoft Patch Tuesday – May 2017 

05-10-2017 03:52 AM

Hello, welcome to this month's blog on the Microsoft patch release. This month the vendor has patched 56 vulnerabilities, 17 of which are rated Critical.

As always, customers are advised to follow these security best practices:

  • Install vendor patches as soon as they are available.
  • Run all software with the least privileges required while still maintaining functionality.
  • Avoid handling files from unknown or questionable sources.
  • Never visit sites of unknown or questionable integrity.
  • Block external access at the network perimeter to all key systems unless specific access is required.

Microsoft's summary of the May 2017 releases can be found here:
https://portal.msrc.microsoft.com/en-us/security-guidance

 

This month's update covers vulnerabilities in:

  • Microsoft Internet Explorer
  • Microsoft Edge
  • Microsoft Office
  • Microsoft .NET Framework
  • Microsoft Hyper-V
  • Microsoft Windows SMB
  • Microsoft Windows

     

     

    The following is a breakdown of the issues being addressed this month:

    1. Cumulative Security Update for Microsoft Internet Explorer and Edge

      Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2017-0226) MS Rating: Important

      A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. This vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Internet Explorer, and then convince a user to view the website.

      Internet Explorer Security Feature Bypass Vulnerability (CVE-2017-0064) MS Rating: Important

      A security feature bypass vulnerability exists when Internet Explorer handles files from the Internet zone. In a web-based attack scenario, an attacker could host a malicious website that is designed to exploit the security feature bypass. Alternatively, in an email or instant message attack scenario, the attacker could send the targeted user a specially crafted .url file that is designed to exploit the bypass.

      Internet Explorer Memory Corruption Vulnerability (CVE-2017-0222) MS Rating: Critical

      A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, the attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. An attacker could host a specially crafted website designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website.

      Microsoft Edge Memory Corruption Vulnerability (CVE-2017-0221) MS Rating: Critical

      A vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. To exploit the vulnerability, an attacker could host a specially crafted website through Microsoft Edge, and then convince a user to view the website.

      Microsoft Edge Memory Corruption Vulnerability (CVE-2017-0240) MS Rating: Critical

      A remote code execution vulnerability exists in the way affected Microsoft scripting engines render when handling objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system.

      Microsoft Scripting Engine Memory Corruption Vulnerability (CVE-2017-0224) MS Rating: Critical

      A remote code execution vulnerability exists in the way the Chakra JavaScript engine renders when handling objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. In a web-based attack scenario, an attacker could host a specially crafted website designed to exploit the vulnerability through a Microsoft browser and then convince a user to view the website.

      Microsoft Scripting Engine Memory Corruption Vulnerability (CVE-2017-0229) MS Rating: Moderate

      A remote code execution vulnerability exists in the way the Chakra JavaScript engine renders when handling objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system.

      Microsoft Scripting Engine Memory Corruption Vulnerability (CVE-2017-0230) MS Rating: Important

      A remote code execution vulnerability exists in the way the Chakra JavaScript engine renders when handling objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system.

      Microsoft Scripting Engine Memory Corruption Vulnerability (CVE-2017-0234) MS Rating: Critical

      A remote code execution vulnerability exists in the way the Chakra JavaScript engine renders when handling objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system.

      Microsoft Scripting Engine Memory Corruption Vulnerability (CVE-2017-0235) MS Rating: Critical

      A remote code execution vulnerability exists in the way the Chakra JavaScript engine renders when handling objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. In a web-based attack scenario, an attacker could host a specially crafted website designed to exploit the vulnerability through a Microsoft browser and then convince a user to view the website.

      Microsoft Scripting Engine Memory Corruption Vulnerability (CVE-2017-0236) MS Rating: Critical

      A remote code execution vulnerability exists in the way that the JScript and VBScript engines render when handling objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system.

      Microsoft Edge Memory Corruption Vulnerability (CVE-2017-0227) MS Rating: Critical

      A remote code execution vulnerability exists in the way affected Microsoft scripting engines render when handling objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system.

      Microsoft Edge Remote Code Execution Vulnerability (CVE-2017-0266) MS Rating: Critical

      A remote code execution vulnerability exists in the way affected Microsoft scripting engines render when handling objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system.

      Microsoft Edge Elevation of Privilege Vulnerability (CVE-2017-0241) MS Rating: Important

      A vulnerability exists when Microsoft Edge renders a domain-less page in the URL, which could allow Microsoft Edge to perform actions in the context of the Intranet Zone and access functionality that is not typically available to the browser when browsing in the context of the Internet Zone. To exploit the vulnerability, an attacker would have to convince a user to browse to a maliciously created webpage.

      Microsoft Edge Elevation of Privilege Vulnerability (CVE-2017-0233) MS Rating: Important

      An elevation of privilege vulnerability exists in Microsoft Edge that could allow an attacker to escape from the AppContainer sandbox in the browser. An attacker who successfully exploited the vulnerability could gain elevated privileges and break out of the Edge AppContainer sandbox. This vulnerability by itself does not allow arbitrary code to be run. However, this vulnerability could be used in conjunction with one or more vulnerabilities (for example a remote code execution vulnerability and another elevation of privilege vulnerability) to take advantage of the elevated privileges when running.

      Microsoft Edge Memory Corruption Vulnerability (CVE-2017-0228) MS Rating: Critical

      A remote code execution vulnerability exists in the way the Chakra JavaScript engine renders when handling objects in memory in Microsoft Edge. This issue may corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user.

      Scripting Engine Memory Corruption Vulnerability (CVE-2017-0238) MS Rating: Critical

      A remote code execution vulnerability exists in the way JavaScript scripting engines handle objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through a Microsoft browser and then convince a user to view the website. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the Edge rendering engine. The attacker could also take advantage of compromised websites, and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability.

      Microsoft Browser Spoofing Vulnerability (CVE-2017-0231) MS Rating: Important

      A spoofing vulnerability exists when Microsoft browsers render SmartScreen Filter. An attacker who successfully exploited this vulnerability could trick a user by redirecting the user to a specially crafted website. The specially crafted website could then either spoof content or serve as a pivot to chain an attack with other vulnerabilities in web services. To exploit the vulnerability, the user must click a specially crafted URL. In an email attack scenario, an attacker could send an email message containing the specially crafted URL to the user in an attempt to convince the user to click it. In a web-based attack scenario, an attacker could host a specially crafted website designed to appear as a legitimate website to the user. However, the attacker would have no way to force the user to visit the specially crafted website. The attacker would have to convince the user to visit the specially crafted website, typically by way of enticement in an email or Instant Messenger message, and then convince the user to interact with content on the website.

    2. Cumulative Security Update for Microsoft Office

      Microsoft Office Remote Code Execution Vulnerability (CVE-2017-0281) MS Rating: Important

      A remote code execution vulnerability exist in Microsoft Office software when the Office software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. The file could then, for example, take actions on behalf of the logged-on user with the same permissions as the current user. Exploitation of this vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. In an email attack scenario an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file that is designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or Instant Messenger message, and then convince them to open the specially crafted file.

      Microsoft Office Memory Corruption Vulnerability (CVE-2017-0254) MS Rating: Important

      A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file.

      Microsoft Office Remote Code Execution Vulnerability (CVE-2017-0261) MS Rating: Critical

      A remote code execution vulnerability exists in Microsoft Office that could be exploited when a user opens a file containing a malformed graphics image or when a user inserts a malformed graphics image into an Office file. Such a file could also be included in an email attachment. An attacker could exploit the vulnerability by constructing a specially crafted EPS file that could allow remote code execution. An attacker who successfully exploited this vulnerability could take control of the affected system. This vulnerability could not be exploited automatically through a Web-based attack scenario. An attacker could host a specially crafted website containing an Office file that is designed to exploit the vulnerability, and then convince a user to view the website. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements by adding specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by getting them to click a link in an instant messenger or email message that takes users to the attacker's website, or by getting them to open an attachment sent through email. If Word is the selected email reader, which is the default setting, then an attacker could leverage Outlook for an email-based attack by sending a specially crafted file, containing an EPS image binary, to the targeted user. In this scenario this attack vector requires minimal user action (as in viewing a specially crafted email through the preview pane in Outlook) to be exploited. Workstations and terminal servers that have Microsoft Office installed are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs.

      Microsoft SharePoint XSS Vulnerability (CVE-2017-0255) MS Rating: Important

      An elevation of privilege vulnerability exists when SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected SharePoint server. The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. These attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions on the SharePoint site on behalf of the victim, such as change permissions and delete content, and inject malicious content in the browser of the victim.

      Microsoft Office Remote Code Execution Vulnerability (CVE-2017-0262) MS Rating: Important

      A remote code execution vulnerability exists in Microsoft Office that could be exploited when a user opens a file containing a malformed graphics image or when a user inserts a malformed graphics image into an Office file. Such a file could also be included in an email attachment. An attacker could exploit the vulnerability by constructing a specially crafted EPS file that could allow remote code execution. An attacker who successfully exploited this vulnerability could take control of the affected system. This vulnerability could not be exploited automatically through a Web-based attack scenario. An attacker could host a specially crafted website containing an Office file that is designed to exploit the vulnerability, and then convince a user to view the website. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements by adding specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by getting them to click a link in an instant messenger or email message that takes users to the attacker's website, or by getting them to open an attachment sent through email. If Word is the selected email reader, which is the default setting, then an attacker could leverage Outlook for an email-based attack by sending a specially crafted file, containing an EPS image binary, to the targeted user. In this scenario this attack vector requires minimal user action (as in viewing a specially crafted email through the preview pane in Outlook) to be exploited. Workstations and terminal servers that have Microsoft Office installed are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs.

      Microsoft Office Memory Corruption Vulnerability (CVE-2017-0265) MS Rating: Important

      A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file.

      Microsoft Office Memory Corruption Vulnerability (CVE-2017-0264) MS Rating: Important

      A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file.

    3. Cumulative Security Update for Microsoft .NET Framework

      .Net Security Feature Bypass Vulnerability (CVE-2017-0248) MS Rating: Important

      A Security Feature Bypass vulnerability exists when Microsoft .NET Framework (and .NET Core) components do not completely validate certificates. An attacker could present a certificate that is marked invalid for a specific use, but the component uses it for that purpose. This action disregards the Enhanced Key Usage taggings.

    4. Cumulative Security Update for Microsoft Windows Hyper-V

      Windows Hyper-V vSMB Elevation of Privilege Vulnerability (CVE-2017-0212) MS Rating: Important

      An elevation of privilege vulnerability exists when Windows Hyper-V on a host server fails to properly validate vSMB packet data. An attacker who successfully exploited these vulnerabilities could gain elevated privileges on a target operating system. This vulnerability by itself does not allow arbitrary code to be run. However, this vulnerability could be used in conjunction with one or more vulnerabilities (e.g. a remote code execution vulnerability and another elevation of privilege) that could take advantage of the elevated privileges when running.

    5. Cumulative Security Update for Microsoft Windows SMB

      Windows SMB Remote Code Execution Vulnerability (CVE-2017-0272) MS Rating: Critical

      A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Remote Code Execution Vulnerability (CVE-2017-0277) MS Rating: Critical

      A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Remote Code Execution Vulnerability (CVE-2017-0278) MS Rating: Critical

      A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Remote Code Execution Vulnerability (CVE-2017-0279) MS Rating: Critical

      A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0267) MS Rating: Important

      An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0268) MS Rating: Important

      An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0270) MS Rating: Important

      An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0271) MS Rating: Important

      An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0274) MS Rating: Important

      An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0275) MS Rating: Important

      An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0276) MS Rating: Important

      An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0269) MS Rating: Important

      A denial of service vulnerability exists in the Microsoft Server Block Message (SMB) when an attacker sends specially crafted requests to the server. An attacker who exploited this vulnerability could cause the affected system to stop responding until it is manually restarted. To attempt to exploit this issue, an attacker would need to send specially crafted SMB requests to the target system. Note that the denial of service vulnerability would not allow an attacker to execute code or to elevate their user rights, but it could cause the affected system to stop accepting requests.

      Windows SMB Denial of Service Vulnerability (CVE-2017-0273) MS Rating: Important

      A denial of service vulnerability exists in the Microsoft Server Block Message (SMB) when an attacker sends specially crafted requests to the server. An attacker who exploited this vulnerability could cause the affected system to stop responding until it is manually restarted. To attempt to exploit this issue, an attacker would need to send specially crafted SMB requests to the target system.

      Windows SMB Information Disclosure Vulnerability (CVE-2017-0280) MS Rating: Important

      A denial of service vulnerability exists in the Microsoft Server Block Message (SMB) when an attacker sends specially crafted requests to the server. An attacker who exploited this vulnerability could cause the affected system to stop responding until it is manually restarted. To attempt to exploit this issue, an attacker would need to send specially crafted SMB requests to the target system. Note that the denial of service vulnerability would not allow an attacker to execute code or to elevate their user rights, but it could cause the affected system to stop accepting requests.

    6. Cumulative Security Update for Microsoft Windows

      Win32k Elevation of Privilege Vulnerability (CVE-2017-0246) MS Rating: Important

      An elevation of privilege vulnerability exists when Windows improperly handlesobjects in memory. An attacker who successfully exploited this vulnerabilitycould run processes in an elevated context. On systems with Windows 7 for x64-based Systems or later installed, this vulnerability can lead to denial of service. To exploit the vulnerability, an attacker would have to either log on locally to an affected system, or convince a locally authenticated user to execute a specially crafted application.

      Windows Kernel Elevation of Privilege Vulnerability (CVE-2017-0244) MS Rating: Important

      An elevation of privilege vulnerability exists in the way that the Windows Kernelhandles objects in memory. An attacker who successfully exploited thevulnerability could execute code with elevated permissions. On systems with Windows 7 for x64-based Systems or later installed, this vulnerability can lead to denial of service. To exploit the vulnerability, an attacker would have to either log on locally to an affected system, or convince a locally authenticated user to execute a specially crafted application.

      Windows Kernel Information Disclosure Vulnerability (CVE-2017-0175) MS Rating: Important

      An information disclosure vulnerability exists when the Windows kernel improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user's system. An authenticated attacker could exploit this vulnerability by running a specially crafted application.

      Windows Kernel Information Disclosure Vulnerability (CVE-2017-0220) MS Rating: Important

      An information disclosure vulnerability exists when the Windows kernel improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user's system. An authenticated attacker could exploit this vulnerability by running a specially crafted application.

      Windows Kernel Information Disclosure Vulnerability (CVE-2017-0258) MS Rating: Important

      An information disclosure vulnerability exists when the Windows kernel improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user's system. An authenticated attacker could exploit this vulnerability by running a specially crafted application.

      Windows Kernel Information Disclosure Vulnerability (CVE-2017-0259) MS Rating: Important

      An information disclosure vulnerability exists when the Windows kernel improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user's system. An authenticated attacker could exploit this vulnerability by running a specially crafted application.

      Dxgkrnl.sys Elevation of Privilege Vulnerability (CVE-2017-0077) MS Rating: Important

      An elevation of privilege vulnerability exists when the Windows improperly handles objects in memory. In a local attack scenario, an attacker could exploit this vulnerability by running a specially crafted application to take control over the affected system. An attacker who successfully exploited this vulnerability could run processes in an elevated context.

      Win32k Information Disclosure Vulnerability (CVE-2017-0245) MS Rating: Important

      An information disclosure vulnerability exists when the win32k component improperly provides kernel information. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user's system. To exploit the vulnerability, an attacker would have to either log on locally to an affected system, or convince a locally authenticated user to execute a specially crafted application.

      Win32k Elevation of Privilege Vulnerability (CVE-2017-0263) MS Rating: Important

      An elevation of privilege vulnerability exists in Windows when the Windows kernel-mode driver fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.

      Windows DNS Server Denial of Service Vulnerability (CVE-2017-0171) MS Rating: Important

      A denial of service vulnerability exists in Windows DNS Server if the server is configured to answer version queries. An attacker who successfully exploited this vulnerability could cause the DNS Server service to become nonresponsive. An attacker could exploit this vulnerability by sending malicious DNS queries, resulting in denial of service.

      Windows COM Elevation of Privilege Vulnerability (CVE-2017-0213) MS Rating: Important

      An elevation of privilege exists in Windows COM Aggregate Marshaler. An attacker who successfully exploited the vulnerability could run arbitrary code with elevated privileges. To exploit the vulnerability, an attacker could run a specially crafted application that could exploit the vulnerability. This vulnerability by itself does not allow arbitrary code to be run. However, this vulnerability could be used in conjunction with one or more vulnerabilities (e.g. a remote code execution vulnerability and another elevation of privilege) that could take advantage of the elevated privileges when running.

      Windows COM Elevation of Privilege Vulnerability (CVE-2017-0214) MS Rating: Important

      An elevation of privilege vulnerability exists when Windows fails to properly validate input before loading type libraries. An attacker could use this vulnerability to elevate their privilege level. To exploit this vulnerability an attacker would first need to have access to the local system and have the ability to execute a malicious application.

      Windows GDI Information Disclosure Vulnerability (CVE-2017-0190) MS Rating: Important

      An information disclosure vulnerability exists in the way that the Windows Graphics Device Interface (GDI) handles objects in memory, allowing an attacker to retrieve information from a targeted system. By itself, the information disclosure does not allow arbitrary code execution; however, it could allow arbitrary code to be run if the attacker uses it in combination with another vulnerability. To exploit this vulnerability, an attacker would have to log on to an affected system and run a specially crafted application.

      Microsoft ActiveX Information Disclosure Vulnerability (CVE-2017-0242) MS Rating: Important

      An information disclosure vulnerability exists in the way some ActiveX objects are instantiated. An attacker who successfully exploited this vulnerability could gain access to protected memory contents. To exploit this vulnerability, an attacker would need to convince a user to open a malicious document that could then instantiate the vulnerable object.

      Microsoft Malware Protection Engine Remote Code Execution Vulnerability (CVE-2017-0290) MS Rating: Critical

      A remote code execution vulnerability exists when the Microsoft Malware Protection Engine does not properly scan a specially crafted file leading to memory corruption. An attacker who successfully exploited this vulnerability could execute arbitrary code in the security context of the LocalSystem account and take control of the system.

    More information is available on Symantec's free Security Center portal and to our customers through the DeepSight Threat Management System.

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