[VulnWatch] gwcc insecure temporary file creation

From: ZATAZ Audits (exploits_at_zataz.net)
Date: 09/16/05

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    Date: Fri, 16 Sep 2005 15:48:14 +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
    
    

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

    gwcc insecure temporary file creation

    Vendor: http://gwcc.sourceforge.net/
    Advisory: http://www.zataz.net/adviso/gwcc-09052005.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 to create and overwrite
    arbitrary files
    with the privileges of the user running the affected script.

    Secunia report that this bug was discovered by D1g1t4lLeech the 2005-09-16.

    ZATAZ Audit has discovered this bug the 2005-09-02

    So I think that D1g1t4lLeech is a true leecher ;)

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

    gwcc <= 0.9.6-r2

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

    To prevent symlink attack use kernel patch such as grsecurity
    Gentoo Patch : http://bugs.gentoo.org/attachment.cgi?id=67477

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

    Discovered : 2005-09-02
    Vendor notified : 2005-09-05
    Vendor response : no reponse
    Vendor fix : no patch
    Vendor Sec report (vendor-sec@lst.de) : 2005-09-13
    Disclosure : 2005-09-16

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

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

    Take a look at : src/callbacks.c

    1702 // Pipe print command and voila!, the doc is printed.
    1703 strcat(print_command, " /tmp/gwcc_out.txt");

    And also into : src/utils.c

    94 else if (strcmp(operation, "temp") == 0) {
    95 strcat(file_name, "/tmp/gwcc_out.txt");

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

    Bug report : http://bugs.gentoo.org/show_bug.cgi?id=104566
    CVE : NONE

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

    Eric Romang (eromang@zataz.net - ZATAZ Audit) - Gentoo Security Scout
    Thxs to Gentoo Security Team.


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