|The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a database and tools to fix them.|
Microsoft HTML Help: buffer overflow
Synthesis of the vulnerability
An attacker can invite the victim to open a malicious CHM file with Microsoft HTML Help, in order to execute code.
Vulnerable systems: Windows 2000, Windows 2003, Windows 2008 R0, Windows 2008 R2, Windows 7, Windows Vista, Windows XP.
Severity of this threat: 2/4.
Consequences of a hack: user access/rights.
Pirate's origin: document.
Creation date: 13/04/2011.
Références of this weakness: BID-47330, VIGILANCE-VUL-10562.
Description of the vulnerability
Files with a CHM extension are compiled help files for Windows, which are opened with Microsoft HTML Help.
Data are compressed in blocks. Microsoft HTML Help thus uncompresses each block before using it. However, if the size of a block is too large, a buffer overflow occurs.
An attacker can therefore invite the victim to open a malicious CHM file with Microsoft HTML Help, in order to execute code.
Full Vigil@nce bulletin... (Free trial)
Computer vulnerabilities tracking service
Vigil@nce provides application vulnerability alerts. The Vigil@nce security watch publishes vulnerability bulletins about threats impacting the information system. The Vigil@nce computer vulnerability tracking service alerts your teams of vulnerabilities or threats impacting your information system. Each administrator can customize the list of products for which he wants to receive vulnerability alerts.