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The 17 Critical Vulnerabilities In Latest Security Bulletin

10/15/20 3:00 PM  |  by RedLegg Blog

In this month's security bulletin, we've got a whopping 17 critical vulnerabilities described.

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Remote Code Execution in The Windows TCP/IP Stack

  • Identifier:  CVE-2020-16898
  • Exploit Info / POC:  No
  • Description: A remote code execution vulnerability exists when the Windows TCP/IP stack improperly handles ICMPv6 Router Advertisement packets. An attacker who successfully exploited this vulnerability could gain the ability to execute code on the target server or client. To exploit this vulnerability, an attacker would have to send specially crafted ICMPv6 Router Advertisement packets to a remote Windows computer. The update addresses the vulnerability by correcting how the Windows TCP/IP stack handles ICMPv6 Router Advertisement packets.
  • Mitigation Recommendation: Patching is currently the only mitigation method.
  • Update: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16898

XSS in Microsoft Sharepoint 

  • Identifier:  CVE-2020-16945, CVE-2020-16946
  • Exploit Info / POC:  No
  • Description: A cross-site-scripting (XSS) vulnerability exists when Microsoft 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. The 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 user, such as change permissions and delete content, and inject malicious content in the browser of the user. The security update addresses the vulnerability by helping to ensure that SharePoint Server properly sanitizes web requests.
  • Mitigation Recommendation: Patching is currently the only mitigation method.
  • Update: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16946

Spoofing/Reflective XSS in Microsoft Sharepoint 

  • Identifier:  CVE-2020-16944
  • Exploit Info / POC:  No
  • Description: This vulnerability is caused when SharePoint Server does not properly sanitize a specially crafted request to an affected SharePoint server. An authenticated attacker could exploit this vulnerability by sending a specially crafted request to an affected SharePoint server. The attacker who successfully exploited this 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, delete content, steal sensitive information (such as browser cookies) and inject malicious content in the browser of the victim. For this vulnerability to be exploited, a user must click a specially crafted URL that takes the user to a targeted SharePoint Web App site. In an email attack scenario, an attacker could exploit the vulnerability by sending an email message containing the specially crafted URL to the user of the targeted SharePoint Web App site and convincing the user to click the specially crafted URL. In a web-based attack scenario, an attacker would have to host a website that contains a specially crafted URL to the targeted SharePoint Web App site that is used to attempt to exploit these vulnerabilities. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could exploit the vulnerability. An attacker would have no way to force users to visit a specially crafted website. Instead, an attacker would have to convince them to visit the website, typically by getting them to click a link in an instant messenger or email message that takes them to the attacker's website, and then convince them to click the specially crafted URL. The security update addresses the vulnerability by helping to ensure that SharePoint Server properly sanitizes user web requests.
  • Mitigation Recommendation: Patching is currently the only mitigation method.
  • Update: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16944

 

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