Use-after-free vulnerability in Microsoft Office XP SP3, Office 2003 SP3, Office 2007 SP2, Office 2004 and 2008 for Mac, and Open XML File Format Converter for Mac allows remote attackers to execute arbitrary code via malformed shape data in the Office drawing file format, aka "Microsoft Office Graphic Object Dereferencing Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12339
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-023
http://zerodayinitiative.com/advisories/ZDI-11-043/
http://www.vupen.com/english/advisories/2011/0942
http://www.us-cert.gov/cas/techalerts/TA11-102A.html
http://www.securitytracker.com/id?1025343
http://secunia.com/advisories/44015
http://secunia.com/advisories/43216
http://dvlabs.tippingpoint.com/blog/2011/02/07/zdi-disclosure-microsoft