Microsoft Infotech Storage library Heap Corruption

Risk: Low
Local: Yes
Remote: Yes
CWE: CWE-119

CVSS Base Score: 4/10
Impact Subscore: 4.9/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: None

Microsoft Infotech Storage System Library (itss.dll) is prone to a heap corruption vulnerability. This issue is due to the failure of the library to properly check a specially crafted CHM file. The successful exploitation of this flaw would allow to execute arbitrary code. Itss.dll is the system library, which deals with CHM/ITS format. Microsoft rates the CHM file format as potentially dangerous,similar to an executable file. Nevertheless, this flaw is triggered just decompiling the malicious CHM file (using hh -decompile), thus malicious attackers could trick the user to perform this operation or even, advanced users or researchers could try to decompile before opening it. Microsoft plans to address this issue in the next Service Pack. Due to this fact, users of certain Windows versions should implement their own protection mechanism. Advisory and proof of concept available at Regards, Rubn Santamarta

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