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OSVDB: OSVDB-99555

MS13-090 CardSpaceClaimCollection ActiveX Integer Underflow
Posted Nov 26, 2013
Authored by juan vazquez, temp66 | Site metasploit.com

This Metasploit module exploits a vulnerability on the CardSpaceClaimCollection class from the icardie.dll ActiveX control. The vulnerability exists while the handling of the CardSpaceClaimCollection object. CardSpaceClaimCollections stores a collection of elements on a SafeArray and keeps a size field, counting the number of elements on the collection. By calling the remove() method on an empty CardSpaceClaimCollection it is possible to underflow the length field, storing a negative integer. Later, a call to the add() method will use the corrupted length field to compute the address where write into the SafeArray data, allowing to corrupt memory with a pointer to controlled contents. This Metasploit module achieves code execution by using VBScript as discovered in the wild on November 2013 to (1) create an array of html OBJECT elements, (2) create holes, (3) create a CardSpaceClaimCollection whose SafeArray data will reuse one of the holes, (4) corrupt one of the legit OBJECT elements with the described integer overflow and (5) achieve code execution by forcing the use of the corrupted OBJECT.

tags | exploit, overflow, code execution, activex
advisories | CVE-2013-3918, OSVDB-99555
MD5 | 67794b47c6fcc01e6db48548eec65d27
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