Document Title: =============== Barracuda CudaTel 2.6.02.040 - CS Cross Site Vulnerability Date: ===== 2013-07-14 References: =========== http://www.vulnerability-lab.com/get_content.php?id=776 BARRACUDA NETWORK SECURITY ID: BNSEC-807 VL-ID: ===== 776 Common Vulnerability Scoring System: ==================================== 2.1 Introduction: ============= Designed to enable seamless voice and video communication, the CudaTel Communication Server is an easy-to-use, affordable, next-generation phone system for businesses. CudaTel Communication Server s enterprise-class feature set includes Voice over IP (VoIP) PBX services, conferencing, follow-me, automated attendant services, and more, controlled by an easy-to-use Web interface. CudaTel Communication Server is compatible with any SIP device and provider, and can be pre-configured for use with both analog and digital telephone networks. Powerful, Complete Solution With an expansive feature set and and no per user or phone licensing fees, the CudaTel Communication Server is equipped and priced for organizations of any size. Native High Definition audio support and integrated phone line (TDM) hardware produces an unparalleled audio experience. VOIP encryption protects calls from hackers and digital eavesdroppers. (Copy of the Vendor Homepage: http://www.cudatel.com ) Abstract: ========= The Vulnerability Laboratory Research Team discovered a client side web vulnerability in Barracuda Networks CudaTel v2.6.002.040 appliance application. Report-Timeline: ================ 2012-11-26: Researcher Notification & Coordination 2012-11-27: Vendor Notification 2012-12-01: Vendor Response/Feedback 2013-04-03: Vendor Fix/Patch 2013-07-15: Public Disclosure Status: ======== Published Affected Products: ================== Barracuda Networks Product: CudaTel - Communication Server v2.6.002.040 Exploitation-Technique: ======================= Remote Severity: ========= Medium Details: ======== A client side input validation vulnerability is detected in Barracuda Networks CudaTel v2.6.002.040 appliance application. The non-persistent vulnerability allows remote attackers to manipulate website links to provoke malicious client side (application-side) requests. The second vulnerability (client side) is located in the `error:Internal Error` exception handling. When remote attackers provoke to load an invalid request the exception-handling will display the earlier inserted bbx_hostname (malicious) web context (exp. script codes). The attacker can use the vulnerable bbx_backup_site_host parameter of the test connection listing module to provoke an evil application exception-handling request. Successful exploitation of the vulnerability results in client side phishing, client side session hijacking and client side external redirects to malware or evil websites. Exploitation of the vulnerability requires medium application user interaction. Vulnerable Section(s): [+] Test - Connection Vulnerable Module(s): [+] Exception-handling [Internal Error] - Listing Vulnerable Parameter(s): [+] bbx_backup_site_host Proof of Concept: ================= The vulnerability can be exploited by remote attackers with low or medium required user interaction and without privileged application user account. For demonstration or reproduce ... Review: Exception-handling [Internal Error] - Listing [bbx_backup_site_host] 
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error: "Internal error.\n[backup] 
Can't connect to >\"
PoC: http://cudatel.ptest.cudasvc.com/gui/backup/test ?_=1353975862209&bbx_backup_site_id=2&bbx_backup_site_type=ftp &bbx_backup_site_host=%3E%22%3Ciframe%20src=http://vulnerability-lab.com%3E&bbx_backup_site_port=8&bbx_backup_site_user=BENJAMINKM &bbx_backup_site_path=%2F+%26+echo+%3E+%2Fdata%2Fsounds%2Fmusic%2F8%2F2a10577f-6764-4368-8571-44d42e4695ff Solution: ========= The vulnerability can be patched by parsing the vulnerable bbx_backup_site_host parameter request. Parse the internal error exception-handling when processing to display the error string of the requested parameter. (error context) 2013-04-03: Vendor Fix/Patch Note: Barracuda Networks provided a download in the customer section but also automatic update to patch the issue in the appliance series. Risk: ===== The security risk of the client side input validation vulnerability is estimated as medium(-) because of the main location in the exception-handling. Credits: ======== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com) Disclaimer: =========== 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. Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - admin@evolution-sec.com Section: www.vulnerability-lab.com/dev - forum.vulnerability-db.com - magazine.vulnerability-db.com Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use or edit our material contact (admin@vulnerability-lab.com or research@vulnerability-lab.com) to get a permission. Copyright © 2013 | Vulnerability Laboratory [Evolution Security]