iDefense Security Advisory 07.16.07 - Remote exploitation of a stack-based buffer overflow vulnerability in Trend Micro Inc.'s OfficeScan for Windows could allow attackers to execute arbitrary code with the privileges of the IIS Web User. The OfficeScan installation includes a series of CGI executables that are used for configuration through the Web interface. A shared library, CGIOCommon.dll, is used by many of these binaries to access environment variables passed to them from the parent IIS process. If a malicious Web request is made for a vulnerable binary, including an overly long session cookie, a stack-based Unicode buffer overflow will occur. iDefense has confirmed this vulnerability in OfficeScan 7.3 with all current patches applied. Testing has shown that this attack can be conducted by requesting multiple CGI binaries that make use of the shared library. Other versions are suspected to be vulnerable.
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