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TITLE:
Python tarfile Module Directory Traversal and Symlink Vulnerability

SECUNIA ADVISORY ID:
SA26623

VERIFY ADVISORY:
http://secunia.com/advisories/26623/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Python 2.5.x
http://secunia.com/product/14172/

DESCRIPTION:
Some vulnerabilities have been reported in the Python tarfile module,
which can be exploited by malicious people to compromise a vulnerable
system.

The vulnerabilities are caused due to input validation errors when
extracting tar archives. This can be exploited to extract files to
arbitrary locations outside the specified directory with the
permissions of the application using the tarfile module by using the
"../" directory traversal sequence or malicious symlinks in a
specially crafted tar archive.

The vulnerabilities are reported in Python 2.5. Other versions may
also be affected.

SOLUTION:
Do not extract untrusted tar archives.

PROVIDED AND/OR DISCOVERED BY:
Jan Matejek

ORIGINAL ADVISORY:
http://mail.python.org/pipermail/python-dev/2007-August/074290.html
http://bugs.python.org/issue1044

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About:
This Advisory was delivered by Secunia as a free service to help
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vulnerabilities.

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http://secunia.com/about_secunia_advisories/


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