[VulnWatch] apachetop insecure temporary file creation

From: ZATAZ Audits (exploits_at_zataz.net)
Date: 09/30/05

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    Date: Fri, 30 Sep 2005 14:17:59 +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
    
    

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

    apachetop insecure temporary file creation

    Vendor: http://clueful.shagged.org/apachetop/
    Advisory: http://www.zataz.net/adviso/apachetop-09022005.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:
    ##########

    apachetop <= 0.12.5

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

    Apply : apachetop_CAN-2005-2660.patch
    Patch from Steve Kemp (Debian)
    http://bugs.gentoo.org/attachment.cgi?id=69342

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

    Discovered : 2005-09-02
    Vendor notified : 2005-09-02
    Vendor response : no reponse
    Vendor fix : no patch
    Vendor Sec report (vendor-sec@lst.de) : 2005-09-13
    Disclosure : 2005-09-30

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

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

    ake a look at : src/apachetop.h

    247 #define DEBUG_OUTPUT "/tmp/atop.debug"

    Then in : src/apachetop.cc

    85 cf.debug = true;

    1103 int dprintf(const char *fmt, ...) /* {{{ */
    1104 {
    1105 FILE *d;
    1106 va_list args;
    1107
    1108 if (cf.debug && (d = fopen(DEBUG_OUTPUT, "a")))
    1109 {
    1110 va_start(args, fmt);
    1111 vfprintf(d, fmt, args);
    1112 fclose(d);
    1113 va_end(args);
    1114 }
    1115
    1116 return 0;
    1117 } /* }}} */

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

    Bug report : http://bugs.gentoo.org/show_bug.cgi?id=104473
    CVE : CAN-2005-2660

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

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


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