100753

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8745

The Microsoft Sharepoint Server installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities :

  - A remote code execution vulnerability exists in     Microsoft Office software when it 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. For example, the file could then     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. However, an     attacker would have no way to force the user to visit     the website. Instead, an attacker would have to convince     the user to click a link, typically by way of an     enticement in an email or Instant Messenger message, and     then convince the user to open the specially crafted     file. The security update addresses the vulnerability by     correcting how Microsoft Office handles files in memory.
    (CVE-2017-8631)

  - 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. Note that the Preview Pane     is not an attack vector for this vulnerability. The     security update addresses the vulnerability by     correcting how Office handles objects in memory.
    (CVE-2017-8742, CVE-2017-8743)

  - An elevation of privilege 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. 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 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. (CVE-2017-8629)

  - 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. (CVE-2017-8745)

CVE-2017-8745

medium

Tenable Plugins

high