Forwarded from: US-CERT <alert@us-cert.gov> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 HTTP Parsing Vulnerabilities in Check Point Firewall-1 Original release date: February 05, 2004 Last revised: -- Source: US-CERT A complete revision history can be found at the end of this file. Systems Affected * Check Point Firewall-1 NG FCS * Check Point Firewall-1 NG FP1 * Check Point Firewall-1 NG FP2 * Check Point Firewall-1 NG FP3, HF2 * Check Point Firewall-1 NG with Application Intelligence R54 * Check Point Firewall-1 NG with Application Intelligence R55 Overview Several versions of Check Point Firewall-1 contain a vulnerability that allows remote attackers to execute arbitrary code with administrative privileges. This allows the attacker to take control of the firewall, and in some cases, to also control the server it runs on. I. Description The Application Intelligence (AI) component of Check Point Firewall-1 is an application proxy that scans traffic for application layer attacks once it has passed through the firewall at the network level. Earlier versions of Firewall-1 include the HTTP Security Server, which provides similar functionality. Both the AI and HTTP Security Server features contain an HTTP parsing vulnerability that is triggered by sending an invalid HTTP request through the firewall. When Firewall-1 generates an error message in response to the invalid request, a portion of the input supplied by the attacker is included in the format string for a call to sprintf(). Researchers at Internet Security Systems have determined that it is possible to exploit this format string vulnerability to execute commands on the firewall. The researchers have also determined that this vulnerability can be exploited as a heap overflow, which would allow an attacker to execute arbitrary code. In either case, the commands or code executed by the attacker would run with administrative privileges, typically "SYSTEM" or "root". For more information, please see the ISS advisory at: http://xforce.iss.net/xforce/alerts/id/162 The CERT/CC is tracking this issue as VU#790771. This reference number corresponds to CVE candidate CAN-2004-0039. II. Impact This vulnerability allows remote attackers to execute arbitrary code on affected firewalls with administrative privileges, typically "SYSTEM" or "root". Failed attempts to exploit this vulnerability may cause the firewall to crash. III. Solution Apply the patch from Check Point Check Point has published a "Firewall-1 HTTP Security Server Update" that modifies the error return strings used when an invalid HTTP request is detected. For more information, please see the Check Point bulletin at: http://www.checkpoint.com/techsupport/alerts/security_server.html This update prevents attackers from using several known error strings to exploit this vulnerability. It is unclear at this time whether there are other attack vectors that may still allow exploitation of the underlying software defect. Disable the affected components Check Point has reported that their products are only affected by this vulnerability if the HTTP Security Servers feature is enabled. Therefore, affected sites may be able to limit their exposure to this vulnerability by disabling HTTP Security Servers or the Application Intelligence component, as appropriate. _________________________________________________________________ This vulnerability was discovered and researched by Mark Dowd of ISS X-Force. _________________________________________________________________ This document was written by Jeffrey P. Lanza. _________________________________________________________________ This document is available from: http://www.us-cert.gov/cas/techalerts/TA04-036A.html _________________________________________________________________ Copyright 2004 Carnegie Mellon University. Revision History Feb 05, 2004: Initial release -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFAIsBMXlvNRxAkFWARApI0AKD4vWl9qb4hYtEr+zlkUScaY3PFcwCfRXcG pglRULK2zVbnACsvG9+BEog= =6SAE -----END PGP SIGNATURE----- - ISN is currently hosted by Attrition.org To unsubscribe email majordomo@private with 'unsubscribe isn' in the BODY of the mail.
This archive was generated by hypermail 2b30 : Fri Feb 06 2004 - 03:06:02 PST