[UNIX] Zip Long Path Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 11/09/04

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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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