SEC Consult Security Advisory < 20090525-4 > ========================================================================== title: SonicOS Format String Vulnerability program: SonicWALL Global VPN Client vulnerable version: PRO 4100 SonicOS 4.0.0.2-51e Standard and Enhanced possibly other versions homepage: http://www.sonicwall.com found: October 2006 by: lofi42 permanent link: https://www.sec-consult.com/advisories_e.html#a54 ========================================================================== Product description: -------------------- SonicOS Enhanced (SonicOSe) is the latest version of SonicWALL's powerful SonicOS operating system, designed for the next generation of SonicWALL firewall/VPN appliances. Vulnerability overview: ----------------------- A format string vulnerability exists in the logfile parsing function of SonicOS. An attacker could crash the system or execute arbitrary code by injecting format string metacharacters into the logfile, if an administrator subsequently uses the SonicOS GUI to view the log. Proof of concept: ----------------- There are multiple ways to inject format string characters into the logs. The following methods can be used to test for the vulnerability: 1. CFS: Add ebay.com to your "Forbidden Domains" and access http://www.ebay.com/%s%s%s%s%s%s/. 2. GroupVPN: Establish an GroupVPN Tunnel and enter at the XAUTH Username %s%s%s%s%s. 3. Webfrontend: Enter at the Login Page of your SonicWALL as Username %s %s%s%s%s. SEC Consult will not release code execution exploits for this vulnerability to the public. Vendor contact timeline: ------------------------ 2006: Vulnerability found 2006.10.25: Vulnerability first reported to vendor 2009.02.17: Vulnerability reported to vendor again 2009.03.16: Request for status update 2009.04.21: Request for status update 2009.05.25: Public Release Patch: ------ SEC Consult was not able to get any vendor feedback on this issue. We are currently not aware of a patch or workaround.