[UNIX] apachetop Insecure Temporary File Creation

From: SecuriTeam (support_at_securiteam.com)
Date: 10/06/05

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Date: 6 Oct 2005 10:44:42 +0200

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      apachetop Insecure Temporary File Creation
    ------------------------------------------------------------------------

    SUMMARY

     <http://clueful.shagged.org/apachetop/> apachetop - "Realtime Apache
    monitoring tool. A curses-based top-like display for Apache information,
    including requests per second, bytes per second, most popular URLs, etc."

    apachetop creates a predictable temporary file, this allows a local
    attacked to use the program to preform symlink attacks.

    DETAILS

    Vulnerable Systems:
     * apachetop versions 0.12.5 and prior

    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.

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2660>
    CAN-2005-2660

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

    Vulnerable code :
    Take 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 } /* }}} */

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:eromang@zataz.net> Eric
    Romang.
    The original article can be found at:
    <http://www.zataz.net/adviso/apachetop-09022005.txt>
    http://www.zataz.net/adviso/apachetop-09022005.txt
    The bug report can be found at:
    <http://bugs.gentoo.org/show_bug.cgi?id=104473>
    http://bugs.gentoo.org/show_bug.cgi?id=104473

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