Document Title: =============== Barracuda Web Filter 910 - Multiple Web Vulnerabilities Date: ===== 2011-12-02 References: =========== http://www.vulnerability-lab.com/get_content.php?id=29 CNNVD-201112-010 VL-ID: ===== 29 Introduction: ============= Barracuda Networks - Worldwide leader in email and Web security. The Barracuda Web Filter is an integrated content filtering, application blocking and malware protection solution that is powerful, easy to use and affordable for businesses of all sizes. It enforces Internet usage policies by blocking access to Web sites and Internet applications that are not related to business, and it easily and completely eliminates spyware and other forms of malware from your organization. No more productivity loss trying to repair computers or make computers usable again. Barracuda Web Filter. * Blocks access to Web sites based on domain, URL pattern, or content category * Blocks downloads based on file type * Blocks applications that access the Internet, including IM, music services, and software update utilities * Integrates with safe search filters built into popular images search engines * Provides integrated gateway and desktop spyware protection The Barracuda Web Filter combines preventative, reactive, and proactive measures to form a complete Web filtering solution. Designed for the enterprise, the Barracuda Web Filter enables you to set up custom policies for particular user and groups across customizable time ranges. The Barracuda Web Filter integrates with popular LDAP directory servers, such as Microsoft Active Directory, for both authentication and group membership information on which to apply custom policies. Sample uses of group policies include: * Restricting access to job board Web sites to only the Human Resources group * Defining separate policies for teachers and students at a school * Enabling compliance officers unrestricted access to the Web for investigation * Providing external instant messaging (e.g., AIM) access only to specific users or groups * Restricting personal Web browsing to non-working hours For organizations that do not utilize directory servers, policies can be defined for unauthenticated users as a whole, locally defined users and groups, or network IP address ranges. (Copy of the Vendor Homepage: http://www.barracudanetworks.com/ns/products/web-filter-overview.php) Abstract: ========= Vulnerability-Lab team discovered multiple Web Vulnerabilities on Barracudas Web Filter 910 appliance. Report-Timeline: ================ 2011-06-02: Vendor Notification 2011-07-06: Vendor Response/Feedback 2011-08-11: Vendor Fix/Patch 2011-12-03: Public or Non-Public Disclosure Status: ======== Published Exploitation-Technique: ======================= Remote Severity: ========= High Details: ======== Multiple persistent Input Validation vulnerabilities are detected on Barracudas Web Filter 910. Local low privileged user accounts can implement/inject malicious persistent script code. When exploited by an authenticated user, the identified vulnerabilities can lead to information disclosure, access to intranet available servers, manipulated persistent content. Affected: [+] Barracuda Web Filter 910 Version(s): [+] Firmware v4.3.0.011 & older versions Proof of Concept: ================= The vulnerabilities can be exploited by local low privileged user accounts or remote with high required user inter action. For demonstration or reproduce ... Vulnerable Module(s): [+] Basic/Reports - Schedule Report [+] Local User Search - EXCPT [+] Active Directory User/Group [+] NTLM User Search [+] Backup Test - Display Manually reproduce ... 1. Login 2. Switch to the vulnerable module of the application 3. Switch to the input fields over add & include your own script code. Save! 4. Enjoy the persistent output results Pictures: ../wf1.png ../wf1_review.png Solution: ========= Barracuda implemented after the issues 2011 a validation mask to filter malicious & disallowed inputs. The barracuda firmware of the filter has been update multiple times. Risk: ===== The security risk of the discovered vulnerabilities are estimated as high(-). Credits: ======== Vulnerability Research Laboratory - Benjamin Kunz Mejri (Rem0ve) & Pim J.F.P. Campers (X4lt) Disclaimer: =========== The information provided in this advisory is provided as it is without any warranty. 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