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TITLE:
gzip Directory Traversal Vulnerability

SECUNIA ADVISORY ID:
SA15047

VERIFY ADVISORY:
http://secunia.com/advisories/15047/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
gzip 1.x
http://secunia.com/product/4220/

DESCRIPTION:
Ulf Härnhammar has reported a vulnerability in gzip, 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
extracting a file with the "-N" flag using "gunzip". This makes it
possible to have a file extracted to an arbitrary location outside
the current directory via directory traversal attacks.

The vulnerability has been reported in version 1.2.4, 1.2.4a, 1.3.3,
1.3.4 and 1.3.5. Other versions may also be affected.

SOLUTION:
Do not extract untrusted ".gz" files with the "-N" flag.

PROVIDED AND/OR DISCOVERED BY:
Ulf Härnhammar

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About:
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