Integer signedness error in the SQLConnectW function in an ODBC API (odbc32.dll) in Microsoft Data Access Components (MDAC) 2.8 SP1 and SP2, and Windows Data Access Components (WDAC) 6.0, allows remote attackers to execute arbitrary code via a long string in the Data Source Name (DSN) and a crafted szDSN argument, which bypasses a signed comparison and leads to a buffer overflow, aka "DSN Overflow Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12333
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-002
http://www.zerodayinitiative.com/advisories/ZDI-11-001/
http://www.vupen.com/english/advisories/2011/0075
http://www.us-cert.gov/cas/techalerts/TA11-011A.html
http://www.securitytracker.com/id?1024947
http://www.securityfocus.com/bid/45695
http://support.avaya.com/css/P8/documents/100124846