Microsoft Office Word PAPX Section Remote Code Execution VulnerabilityZDI-12-201: December 21st, 2012
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This vulnerability allows remote attackers to execute arbitrary code 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 how the application parses a PAPX FKP sections. When parsing a PAPX FKP section, the application will store a calculation. However, when repairing a damaged document, the application will explicitly trust this calculation in a loop that is used to index into an array of objects. This will allow for an out-of-bounds access of an object which can lead to code execution under the context of the application.
Vendor ResponseMicrosoft has issued an update to correct this vulnerability. More details can be found at:
2011-05-25 - Vulnerability reported to vendor
2012-12-21 - Coordinated public release of advisory
CreditThis vulnerability was discovered by: