Title: ====== Barracuda SSL VPN 680 2.2.2.203 - Redirect Web Vulnerability Date: ===== 2013-05-25 References: =========== http://www.vulnerability-lab.com/get_content.php?id=755 Barracuda Networks Security ID (BNSEC): 731 VL-ID: ===== 755 Common Vulnerability Scoring System: ==================================== 1.3 Introduction: ============= The Barracuda SSL VPN is an integrated hardware and software solution enabling secure, clientless remote access to internal network resources from any Web browser. Designed for remote employees and road warriors, the Barracuda SSL VPN provides comprehensive control over file systems and Web-based applications requiring external access. The Barracuda SSL VPN integrates with third-party authentication mechanisms to control user access levels and provides single sign-on. Barracuda SSL VPN * Enables access to corporate intranets, file systems or other Web-based applications * Tracks resource access through auditing and reporting facilities * Scans uploaded files for viruses and malware * Leverages multi-factor, layered authentication mechanisms, including RSA SecurID and VASCO tokens * Integrates with existing Active Directory and LDAP directories * Utilizes policies for granular access control framework * Supports any Web browser on PC or Mac (Copy of the Vendor Homepage: http://www.barracudanetworks.com/ns/products/sslvpn.php) Abstract: ========= The Vulnerability Laboratory Research Team discovered a redirect vulnerability in the official Barracuda Networks SSL VPN 680 v2.2.2.203. Report-Timeline: ================ 2012-11-11: Researcher Notification & Coordination 2012-11-12: Vendor Notification 2012-11-19: Vendor Response/Feedback 2013-02-20: Vendor Fix/Patch 2012-05-27: PublicDisclosure Status: ======== Published Affected Products: ================== Barracuda Networks Product: SSL VPN 680 2.2.2.203 Exploitation-Technique: ======================= Remote Severity: ========= Low Details: ======== A remote redirection (external) vulnerability is detected in the Barracuda SSL VPN 680 v2.2.2.203 (Vx) Web Application Appliance. The bug allows remote attackers to prepare links to client side external redirects with malware, phishing websites or malicious web context. The vulnerability is located in the resourceId parameter request when processing to load via GET method an internal `returnTo` file redirect. Vulnerable Module(s): [+] launchApplication.do [resourceId] Vulnerable Parameter(s): [+] returnTo Proof of Concept: ================= The vulnerability can be exploited by remote attacker without privileged application user account but with medium or high required user inter action. For demonstration or reproduce ... 1.1 The first url shows the standard request via GET request https://sslvpn.127.0.0.1:8080/launchApplication.do?resourceId=1&policy=1&returnTo=%2FshowApplicationShortcuts.do 1.2 The secound url shows the manipulated remote context via GET request https://sslvpn.127.0.0.1:8080/launchApplication.do?resourceId=1&policy=1&returnTo=http://www.vulnerability-lab.com https://sslvpn.[SERVER]/[FILE].do?[RES+ID]=x&[POLICY]=x&returnTo=[EXTERNAL TARGET] Solution: ========= The vulnerability can be patched by allowing only local file requests when processing to load the vulnerable returnTo parameter via GET. 2013-02-20: Vendor Fix/Patch Risk: ===== The security risk of the redirection vulnerability is estimated as low(+). Credits: ======== Vulnerability Laboratory [Research Team] - Chokri Ben Achour (meister@xxxxxxxxxxxxxxxxxxxxx) Barracuda Networks [Security Team] - Dave Farrow (Communication & Coordination) 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. 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