[security-alerts] FW: [SA21794] avast! LHA Archive Processing Buffer Overflow Vulnerability

["Kazennov, Vladimir" <Vladimir.Kazennov@xxxxxxxxxx>]

> ----------------------------------------------------------------------
> 
> TITLE:
> avast! LHA Archive Processing Buffer Overflow Vulnerability
> 
> SECUNIA ADVISORY ID:
> SA21794
> 
> VERIFY ADVISORY:
> http://secunia.com/advisories/21794/
> 
> CRITICAL:
> Highly critical
> 
> IMPACT:
> System access
> 
> WHERE:
> From remote
> 
> SOFTWARE:
> avast! Home/Professional 4.x
> http://secunia.com/product/5162/
> avast! Server Edition 4.x
> http://secunia.com/product/11895/
> 
> DESCRIPTION:
> Ryan Smith has reported a vulnerability in avast!, which can be
> exploited by malicious people to compromise a vulnerable system.
> 
> The vulnerability is caused due to a boundary error in the anti-virus
> engine when processing LHA archives. This can be exploited to cause a
> heap-based buffer overflow via a specially crafted LHA archive with
> overly long filename and directory name extended-header fields.
> 
> Successful exploitation allows execution of arbitrary code.
> 
> The vulnerability is reported in the anti-virus engine prior to
> versions 4.7.869 for desktops and 4.7.660 for servers.
> 
> SOLUTION:
> Update to a fixed version.
> 
> PROVIDED AND/OR DISCOVERED BY:
> Ryan Smith
> 
> ORIGINAL ADVISORY:
> http://www.hustlelabs.com/advisories/04072006_alwil.pdf
>