Vulnerabilities in Microsoft SharePoint Server Could Allow Remote Code Execution (MS15-047)

ITS Advisory Number: 
2015-056
Date(s) Issued: 
Wednesday, May 13, 2015
Subject: 
Vulnerabilities in Microsoft SharePoint Server Could Allow Remote Code Execution (MS15-047)
Overview: 

Vulnerabilities found within Microsoft SharePoint Server could allow remote code execution. Microsoft SharePoint is a software platform and a family of software products designed for collaboration, file sharing and web publishing. Successful exploitation of these vulnerabilities may result in either an attacker gaining the same privileges as the logged on user, or gaining session authentication credentials. Depending on the privileges associated with the user, the attacker could install programs; view, change or delete data or create new accounts with full user rights.

Systems Affected: 
  • Microsoft SharePoint Server 2007
  • Microsoft SharePoint Server 2010
  • Microsoft SharePoint Server 2013
  • Microsoft Office Web Apps 2010
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
High
BUSINESS
Large and medium business entities: 
High
Small business entities: 
High
Home Users: 
High
Description: 

Vulnerabilities found within Microsoft SharePoint Server could allow remote code execution. The details are as follows;

  • A remote code execution vulnerability exists in the way that affected Microsoft Office Services and Web Apps parse content in specially crafted files. This vulnerability requires that a user open a specially crafted Office file with an affected version of Microsoft Excel software.
  • An elevation of privilege vulnerability exists in Microsoft SharePoint Server. The vulnerability is caused when SharePoint Server does not properly protect against a practice known as clickjacking in a SharePoint page. Clickjacking is an online threat whereby an attackers webpage deceives a user into clicking specially crafted content by disguising it as legitimate content.

Successful exploitation of these vulnerabilities may result in either an attacker gaining the same privileges as the logged on user, or gaining session authentication credentials. Depending on the privileges associated with the user, the attacker could install programs; view, change or delete data or create new accounts with full user rights.

Actions: 

We recommend the following actions be taken:

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.