Document Title: =============== Barracuda Backup - Cross Site Scripting Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=799 BARRACUDA NETWORK SECURITY ID: BNSEC-1949 Release Date: ============= 2013-06-10 Vulnerability Laboratory ID (VL-ID): ==================================== 799 Common Vulnerability Scoring System: ==================================== 1.5 Product & Service Introduction: =============================== Barracuda Backup Service is a complete and affordable data backup solution. The Barracuda Backup Server provides a full local data backup and is combined with a storage subscription to replicate data to two offsite locations. This approach provides the best of both worlds - onsite backups for fast restore times and secure, offsite storage for disaster recovery. Block level deduplication is applied inline to reduce traditional backup storage requirements by 20 to 50 times while also reducing backup windows and bandwidth requirements. Cloud Storage with Deduplication Barracuda Backup Subscription plans provide diverse offsite storage at affordable monthly fees that scale to meet increasing data requirements. * Secure backup to two geo-separate data centers * Deduplicated efficient backup storage * Redundant disk-based storage * Best-of-breed data retention policies * Web interface multi-location management * Restore by Web, FTP and Windows software (Copy of the Vendor Homepage: http://www.barracudanetworks.com/ns/products/backup_overview.php) Abstract Advisory Information: ============================== The Vulnerability Laboratory Research Team discovered a client side web vulnerability in the Barracuda Networks Backup Appliance Application. Vulnerability Disclosure Timeline: ================================== 2012-12-27: Researcher Notification & Coordination (Benjamin Kunz Mejri) 2013-01-07: Vendor Notification (Barracuda Networks Security Team) 2012-01-10: Vendor Response/Feedback (Barracuda Networks Security Team) 2012-05-02: Vendor Fix/Patch (Barracuda Networks Developer Team) 2012-06-11: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Low Technical Details & Description: ================================ A non persistent input validation vulnerability is detected in the Barracuda Networks Backup Appliance Application. The bug allows remote attackers to force client side browser requests with manipulated web context or cross site requests. The vulnerability is located in the exception-handling module of the ajax groupid_remove function when processing to load a manipulated date or error message context via GET. The attacker provoke the exception-handling to catch the invalid query, redisplays the context and execute it directly out of the exception-handling. The vulnerability can be exploited by remote attackers without required application user account but with medium or high required user interaction. Successful exploitation of the vulnerability results in client side session hijacking, account take-over, client side phishing, client side external redirects and client side module web context manipulation. Vulnerable Section(s): [+] Groups > Ajax > Call > remove_group Vulnerable Module(s): [+] Exception-Handling Vulnerable Parameter(s): [+] error - message context [+] date Proof of Concept (PoC): ======================= The client side cross site scripting web vulnerability can be exploited by remote attackers without privileged application user account and with medium or high required user interaction. For demonstration or reproduce ... Standard (client-side) Request of a group remove ... https://backup1.127.0.0.1:3737/all/admin/groups/ajax/call/remove_group/group_id/12439 Provoke (client-side) Request of a group remove with exception-handling error ... https://backup1.127.0.0.1:3737/all/admin/groups/ajax/call/remove_group/group_id/12439-1%27 Manipulated (client-side) Request in the exception-handling of a group remove ... https://backup1.127.0.0.1:3737/all/admin/groups/ajax/call/remove_group/group_id/12439-1%27+[CLIENT SIDE SCRIPT CODE!] Solution - Fix & Patch: ======================= The vulnerability can be patched by parsing the groupid remove_group function and parameter request. Parse the exception-handling error and date values when processing to load the output after the invalid get request. 2012-05-02: Vendor Fix/Patch (Barracuda Networks Developer Team) [COORDINATION: Dave Farrow] Security Risk: ============== The security risk of the client side cross site scripting web vulnerability is estimated as low. Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com) 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 vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. 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