SRC-2016-0042 : Microsoft Office Word OneTableDocumentStream Integer Underflow Information Disclosure Vulnerability

Vulnerability Details:

This vulnerability allows remote attackers to disclose information on vulnerable installations of Microsoft Office Word. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the handling of a OneTableDocumentStream chunk during the processing of a specially crafted doc file. A data point value is used to calculate a size variable which can be underflowed before a heap allocation. During further processing, the allocated chunk is used as a source buffer during a memcpy operation leading to an out-of-bounds read condition. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process.

Affected Vendors:

Microsoft

Affected Products:

Office Word

• Microsoft Word 2007 Service Pack 3
• Microsoft Office 2010 Service Pack 2 (32-bit editions)
• Microsoft Office 2010 Service Pack 2 (64-bit editions)
• Microsoft Office Compatibility Pack Service Pack 3
• Microsoft Word for Mac 2011
• Word Automation Services on Microsoft SharePoint Server 2010 Service Pack 2
• Microsoft Office Web Apps 2010 Service Pack 2
  Vendor Response:

Microsoft has issued an update to correct this vulnerability. More details can be found at: <https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2016-7290&gt;