[NEWS] Popper Insecure Temporary File Creation

From: SecuriTeam (support_at_securiteam.com)
Date: 07/06/05

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Date: 6 Jul 2005 15:06:07 +0200

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      Popper Insecure Temporary File Creation
    ------------------------------------------------------------------------

    SUMMARY

    " <http://kpopper.sourceforge.net/> Popper is a very simple, easy-to-use
    and functional network messenger." Due to lack of randomness in the names
    given to temporary files used by the Popper application local attackers
    can gain privileges of other users.

    DETAILS

    Vulnerable Systems:
     * Popper version 1.0 and prior

    The vulnerability is caused due to temporary file being created
    insecurely. This can be exploited via symbolic-link attacks and in turn to
    create and/or overwrite arbitrary files with the privileges of the user
    running the affected script.

    Code Snips:
    popper/popper-send.sh:
    #!/bin/sh
    echo "$2" > /tmp/.popper-new
    echo `date +"%a %l:%m %p"` >> /tmp/.popper-new
    cat "$1" >> /tmp/.popper-new
    mv -f /tmp/.popper-new /tmp/.popper

    The .popper is also used in popper/popper.cpp.

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1917>
    CAN-2005-1917

    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/kpopper-06152005.txt>
    http://www.zataz.net/adviso/kpopper-06152005.txt,
     <http://bugs.gentoo.org/show_bug.cgi?id=94475>
    http://bugs.gentoo.org/show_bug.cgi?id=94475

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