SRC-2016-0042 : Microsoft Office Word OneTableDocumentStream Integer Underflow Information Disclosure Vulnerability
CVE ID:
CVSS Score:
4.3, (AV:N/AC:M/Au:N/C:P/I:N/A:N)
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
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.
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
Disclosure Timeline:
- 2016-09-21 – Vulnerability reported to vendor
- 2016-12-13 – Coordinated public release of advisory
Credit:
This vulnerability was discovered by Steven Seeley of Source Incite