[UNIX] Zip Long Path Buffer Overflow

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To: list@securiteam.com
Date: 9 Nov 2004 19:12:00 +0200

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  Zip Long Path Buffer Overflow
------------------------------------------------------------------------

SUMMARY

 <http://www.info-zip.org/Zip.html> Zip is a compression and file
packaging/archive utility. Although highly compatible both with PKWARE's
PKZIP and PKUNZIP utilities for MS-DOS and with Info-ZIP's own UnZip. Zip
is installed by default with many Linux distributions.

A vulnerability in Zip allows a malicious attacker to run arbitrary code
with a specially crafted zip file.

DETAILS

Vulnerable Systems:
 * Zip Version 2.3 which comes as "zip" package with Debian Linux.
Possibly all earlier Info-Zip versions are vulnerable.

When zip performs recursive folder compression, it does not check for the
length of resulting path. If the path is too long, a buffer overflow
occurs leading to stack corruption and segmentation fault. It is possible
to exploit this vulnerability by embedding a shellcode in directory or
file name. While the issue is not of primary concern for regular users, it
can be critical for environments where zip archives are re-compressed
automatically using Info-Zip application.

Example:
The issue can be reproduced by following these steps:
1. Create an 8-level directory structure, where each directory name is 256
characters long (we used 256 'a' characters).
2. run "zip -r file.zip *". The application will crash with "segmentation
fault"
3. run "gdb -core core `which zip`" (assuming core drop is enabled)
4. type "where" and hit Enter. Here is what you'll see:

Program terminated with signal 11, Segmentation fault.
[garbage truncated]
#0 0x0805108e in error ()
#1 0x61616161 in ?? ()
#2 0x61616161 in ?? ()
#3 0x61616161 in ?? ()

ADDITIONAL INFORMATION

The information has been provided by <mailto:vuln@hexview.com> HexView.
The original article can be found at:
<http://www.hexview.com/docs/20041103-1.txt>
http://www.hexview.com/docs/20041103-1.txt

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