[VulnWatch] kpopper insecure temporary file creation

From: ZATAZ Audits (exploits_at_zataz.net)
Date: 07/05/05

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    Date: Tue, 05 Jul 2005 13:20:20 +0200
    To: vuldb@securityfocus.com, vuln@secunia.com, vuln@k-otik.com, moderators@osvdb.org, bugs@securitytracker.com, submissions@packetstormsecurity.org, news@securiteam.com, xforce@iss.net, bugtraq@securityfocus.com, vulnwatch@vulnwatch.org, full-disclosure@lists.grok.org.uk
    
    

    #########################################################

    kpopper insecure temporary file creation

    Vendor: http://kpopper.sourceforge.net/
    Advisory: http://www.zataz.net/adviso/kpopper-06152005.txt
    Vendor informed: yes
    Exploit available: yes
    Impact : low
    Exploitation : low

    #########################################################

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

    ##########
    Versions:
    ##########

    kpopper <= 1.0

    ##########
    Solution:
    ##########

    To prevent symlink attack use kernel patch such as grsecurity

    #########
    Timeline:
    #########

    Discovered : 2005-06-13
    Vendor notified : 2005-06-15
    Vendor response : no reponse
    Vendor fix : no fix
    Vendor Sec report (vendor-sec@lst.de) : 2005-06-27
    Disclosure : 2005-07-04

    #####################
    Technical details :
    #####################

    Vulnerable code :
    -----------------

    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 into :

    popper/popper.cpp

    #########
    Related :
    #########

    Bug report : http://bugs.gentoo.org/show_bug.cgi?id=94475
    CVE : CAN-2005-1917

    #####################
    Credits :
    #####################

    Eric Romang (eromang@zataz.net - ZATAZ Audit)
    Thxs to Gentoo Security Team. (Taviso, jaervosz, solar, etc.)


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