17645 : Clam AntiVirus Zero Length Cabinet File ENSURE_BITS() Macro DoS
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Info

Last Modified
6 months ago

Percent Complete
90%

Disclosure
Jun 29, 2005

Discovery
Jun 07, 2005

Dates

Exploit
Unknown

Solution
Unknown

Description

 ClamAV contains a flaw that may allow a remote denial of service. The issue is triggered when the ENSURE_BITS() function in the libclamav/mspack/mszipd.c fails to properly validate user supplied input. A remote attacker could send a specially crafted CAB file with a cffile_FolderOffset set to 0xff to cause the program to enter an infinite loop, resulting in a loss of availability of the anti-virus system.

Classification

 Location: Remote/Network Access Required
Attack Type: Denial of Service
Impact: Loss of Availability
Exploit: Exploit Rumored / Private
Disclosure: OSVDB Verified

Solution

 Upgrade to version 0.86 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products
Tomasz Kojm
Watch-list
ClamAV
Watch-list
 0.83

References

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Nessus

 18629 19139

Credit

Unknown or Incomplete

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