I, Librarian PDF Manager 4.6 / 4.7 Command Injection / SSRF / Enumeration

Credit: SE Consult
Risk: High
Local: No
Remote: Yes

SEC Consult Vulnerability Lab Security Advisory < 20170509-0 > ======================================================================= title: Multiple vulnerabilities product: I, Librarian PDF manager vulnerable version: <=4.6 & 4.7 fixed version: 4.8 CVE number: - impact: Critical homepage: https://i-librarian.net/ found: 2017-01-30 by: Wan Ikram (Office Kuala Lumpur) Fikri Fadzil (Office Kuala Lumpur) Jasveer Singh (Office Kuala Lumpur) SEC Consult Vulnerability Lab An integrated part of SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "I, Librarian is a PDF manager or PDF organizer, which enables researchers, scholars, or students to create an annotated collection of PDF articles. If used as a groupware, users may build their virtual library collaboratively, sharing the workload of literature mining. I, Librarian will make your work with scientific literature incredibly efficient." Source: https://i-librarian.net/ Business recommendation: ------------------------ By combining the vulnerabilities documented in this advisory an attacker can fully compromise the web server which has the "I, Librarian" software installed. SEC Consult recommends to install the latest version available immediately and perform a thorough security review of this software. Vulnerability overview/description: ----------------------------------- The application doesn't apply proper validation on some user inputs. As a result, below vulnerabilities can be exploited by authenticated attackers with any roles to fully compromise the system. 1. OS Command Injection Arbitrary OS commands are possible to be executed from "batchimport.php". This is a serious vulnerability as the chances for the web server to be fully compromised are very high. 2. Server-Side Request Forgery This vulnerability allows an attacker to send HTTP requests originating from the web server. As some functions in the web application require requests to be done from localhost, the risk for this vulnerability is considered high. 3. Directory Enumeration It is possible to enumerate all directories in any directory on the server through "jqueryFileTree.php". 4. Reflected Cross Site Scripting This vulnerability was found in "temp.php". It allows an attacker to inject malicious client side scripting which will be executed in the browser of users if they visit the manipulated site. Proof of concept: ----------------- 1. OS Command Injection Below is the detail of a HTTP request that needs to be sent to execute arbitrary OS commands through "batchimport.php": URL : http://$DOMAIN/batchimport.php METHOD : GET PAYLOAD : directory=.&commence=&user="||<os-commands-here>||" 2. Server-Side Request Forgery Below shows an example of the exploitation for this vulnerability. An attacker can reset any user's password which by design requires the request to be sent from localhost. URL : http://$DOMAIN/ajaxsupplement.php METHOD : POST PAYLOAD : form_new_file_link=http://$DOMAIN/resetpassword.php?username=<username>&new_password1=<new-password>&new_password2=<new-password> 3. Directory Enumeration Available directories can be enumerated simply by navigating through the "dir" parameter in "jqueryFileTree.php". URL : http://$DOMAIN/jqueryFileTree.php METHOD : POST PAYLOAD : dir=<path-to-directory> 4. Reflected Cross Site Scripting The following payload shows a simple alert message box: URL : http://$DOMAIN/temp.php METHOD : GET PAYLOAD : tempfile=<script>alert(42)</script> Vulnerable / tested versions: ----------------------------- "I, Librarian" version 4.6 has been tested. This version was the latest at the time the security vulnerabilities were discovered. It is assumed that previous versions are affected as well. Vendor contact timeline: ------------------------ 2017-01-31: Contacting vendor through support@i-librarian.net 2017-01-31: Vendor replied with their PGP public key. 2017-02-03: Provided encrypted advisory and proof of concept to the vendor. 2017-02-09: Patch released, version 4.7. 2017-02-21: Informed vendor on some issues which were not addressed correctly. 2017-03-30: Patch released by the vendor - I, Librarian version 4.8. 2017-05-09: Public release of advisory Solution: --------- Upgrade to I, Librarian 4.8 For further information see: https://i-librarian.net/article.php?id=9 Workaround: ----------- None Advisory URL: ------------- https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/Career.htm Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/About/Contact.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF Jasveer Singh / @2017

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