20335 : chmlib _chm_decompress_block() Function CHM File Processing Overflow
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Info

Last Modified
9 months ago

Percent Complete
100%

Disclosure
Oct 26, 2005

Discovery
Oct 24, 2005

Dates

Exploit
Unknown

Solution
Unknown

Description

 A remote overflow exists in chmlib. The library function "_chm_decompress_block()" fails to perform proper bounds checking, resulting in a stack-based buffer overflow. With a specially crafted CHM file, an attacker can cause arbitrary code execution resulting in a loss of integrity.

Classification

 Location: Remote/Network Access Required
Attack Type: Input Manipulation
Impact: Loss of Integrity
Exploit: Exploit Unknown
Disclosure: OSVDB Verified

Solution

 Upgrade to version 0.37 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products
CHMlib
Watch-list
CHMlib
Watch-list
 0.36
KchmViewer
Watch-list
KchmViewer
Watch-list
 1.0

References

Tools & Filters

Nessus

 22752

Credit
  • Sven Tantau - svenBrand New Doo Doosven-tantau.de - Sven Tantau

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