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[SA12788] Unarj Directory Traversal Vulnerability
From: Secunia Security Advisories (sec-adv
secunia.com)
Date: Tue Oct 12 2004 - 07:06:02 CDT
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TITLE:
Unarj Directory Traversal Vulnerability
SECUNIA ADVISORY ID:
SA12788
VERIFY ADVISORY:
http://secunia.com/advisories/12788/
CRITICAL:
Less critical
IMPACT:
System access
WHERE:
From remote
SOFTWARE:
unarj 2.x
http://secunia.com/product/4036/
DESCRIPTION:
Doubles has reported a vulnerability in Unarj, which potentially can
be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to an input validation error when
unpacking archives. This can be exploited via a directory traversal
attack to overwrite files outside the directory, where the files are
extracted to, if a user is tricked into extracting a malicious
archive using Unarj.
Successful exploitation requires that the "x" option is used to
preserve paths.
The vulnerability has been confirmed in version 2.63 and has also
been reported in version 2.65. Other versions may also be affected.
SOLUTION:
Don't use Unarj with the "x" option to preserve paths on archived
files, which are not fully trusted.
Never unpack archives as "root" or another administrative user.
PROVIDED AND/OR DISCOVERED BY:
Doubles
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