ID

VAR-200912-0424

CVE

CVE-2009-2631

TITLE

Clientless SSL VPN products break web browser domain-based security models

DESCRIPTION

Multiple clientless SSL VPN products that run in web browsers, including Stonesoft StoneGate; Cisco ASA; SonicWALL E-Class SSL VPN and SonicWALL SSL VPN; SafeNet SecureWire Access Gateway; Juniper Networks Secure Access; Nortel CallPilot; Citrix Access Gateway; and other products, when running in configurations that do not restrict access to the same domain as the VPN, retrieve the content of remote URLs from one domain and rewrite them so they originate from the VPN's domain, which violates the same origin policy and allows remote attackers to conduct cross-site scripting attacks, read cookies that originated from other domains, access the Web VPN session to gain access to internal resources, perform key logging, and conduct other attacks. NOTE: it could be argued that this is a fundamental design problem in any clientless VPN solution, as opposed to a commonly-introduced error that can be fixed in separate implementations. Therefore a single CVE has been assigned for all products that have this design. An attacker could use these devices to bypass authentication or conduct other web-based attacks. plural SSL VPN (Web VPN) There is a problem with the product that can bypass the security mechanism of the web browser. SL VPN (Web VPN) Network resources within an organization using a web browser ( Web server, mail server, etc. ) It is a product to provide a safe access method. SSL VPN (Web VPN) The product rewrites content as necessary as a proxy between the web browser and the server. SSL VPN (Web VPN) Web browser security mechanisms by accessing crafted web pages through (Same Origin Policy) May be bypassed. SSL VPN (Web VPN) Products that implement may be affected by this vulnerability.When a user views a specially crafted page, a remote third party VPN Or hijacking your session SSL VPN (Web VPN) There is a possibility that the content accessed through the site may be viewed or altered. Attackers may exploit this issue to violate the same-origin policy to obtain VPN session tokens, read or modify cookie-based authentication credentials, or perform unauthorized actions with the privileges of the web-based VPN domain. Other attacks may also be possible. Clientless SSL VPN products from Cisco, Juniper Networks, and SonicWall are vulnerable. Other vendors' products may also be affected. We will update this BID as more information emerges. 2. Web VPN authenticates the user and assigns an ID to the session, which is sent to the user's browser in the form of a cookie. 3. For example, http://<www.intranet.example.com>/mail.html link becomes https://<webvpnserver>/www.intranet.example.com/mail.html. The cookie set by the requested web server will be converted into a completely unique cookie before being sent to the user's browser to prevent two cookies with the same name from conflicting. For example, a session ID cookie set by intranet.example.com is renamed intranet.example.com_sessionid before being sent to the user's browser. Additionally, Web VPN replaces references to specific HTML DOM objects like document.cookie. These DOM objects are replaced by scripts that return the value of the DOM object, so that they can be accessed within the security context of the requested site domain. SOLUTION: Disable content rewriting for untrusted web servers. The vulnerability is reported in CallPilot 201i, 202i, 600r, 703t, 1002rp, and 1005r. SOLUTION: The vendor recommends to avoid browsing other web sites while logged in to CallPilot Manager or My CallPilot. ---------------------------------------------------------------------- Do you have VARM strategy implemented? (Vulnerability Assessment Remediation Management) If not, then implement it through the most reliable vulnerability intelligence source on the market. Implement it through Secunia. For more information visit: http://secunia.com/advisories/business_solutions/ Alternatively request a call from a Secunia representative today to discuss how we can help you with our capabilities contact us at: sales@secunia.com ---------------------------------------------------------------------- TITLE: Citrix Access Gateway Web VPN Same Origin Policy Bypass SECUNIA ADVISORY ID: SA37696 VERIFY ADVISORY: http://secunia.com/advisories/37696/ DESCRIPTION: A vulnerability has been reported in Citrix Access Gateway, which can be exploited by malicious people to bypass certain security restrictions. The vulnerability is caused due to the web-based VPN implementation prepending the same domain to all opened websites. This can be exploited to bypass a browser's same origin policy and e.g. access cookies for normally restricted domains by tricking a user into browsing to a malicious website via the VPN. The vulnerability is reported in Citrix Access Gateway Enterprise Edition versions 8.1 and later, and all supported Citrix Access Gateway Advanced Edition versions. SOLUTION: Do not allow access to untrusted domains via the VPN. Please see the vendor's advisory for more information. PROVIDED AND/OR DISCOVERED BY: US-CERT credits Michal Zalewski and Mike Zusman for the original report. Additional vulnerability details provided by David Warren and Ryan Giobbi of US-CERT. ORIGINAL ADVISORY: Citrix: http://support.citrix.com/article/CTX123610 US-CERT VU#261869: http://www.kb.cert.org/vuls/id/261869 ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities. 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AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

other

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Michal Zalewski※ lcamtuf@echelon.pl

SOURCES

LAST UPDATE DATE

2024-11-23T23:10:12.162000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE