[UNIX] ncompress Insecure Temporary File Creation

From: SecuriTeam (support_at_securiteam.com)
Date: 09/19/05

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Date: 19 Sep 2005 10:35:36 +0200

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      ncompress Insecure Temporary File Creation
    ------------------------------------------------------------------------

    SUMMARY

    "ncompress implement a fast, simple LZW file compression algorithm."
    ncompress creates a temporary file with a file name that can be easily
    guessed, this allows local attackers perform on it a symbolic link attack.

    DETAILS

    Vulnerable Systems:
     * ncompress version 4.2.4-r1 and prior

    ncompress creates temporary files in an insecure manner in the script
    files of "gzexe.in", "zdiff.in", and "znew.in". An attacker can create a
    race condition using a symbolic link attack and overwrite arbitrary files
    on the system with the privileges of the user that executing the scripts.

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0970>
    CAN-2004-0970

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:exploits@zataz.net> ZATAZ
    Audits .
    The original article can be found at:
    <http://www.zataz.net/adviso/ncompress-09052005.txt>
    http://www.zataz.net/adviso/ncompress-09052005.txt

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