var-200512-0019
Vulnerability from variot
Interpretation conflict in Fortinet FortiGate 2.8, running FortiOS 2.8MR10 and v3beta, allows remote attackers to bypass the URL blocker via an (1) HTTP request terminated with a line feed (LF) and not carriage return line feed (CRLF) or (2) HTTP request with no Host field, which is still processed by most web servers without violating RFC2616. Fortinet FortiGate is prone to a vulnerability that could allow users to bypass the device's URL filtering. FortiGate devices running FortiOS v2.8MR10 and v3beta are vulnerable to this issue. Other versions may also be affected. Fortinet FortiGate is a network security platform developed by Fortinet. The platform provides functions such as firewall, antivirus and intrusion prevention (IPS), application control, antispam, wireless controller and WAN acceleration.
TITLE: FortiGate URL Filter and Virus Scanning Bypass Vulnerabilities
SECUNIA ADVISORY ID: SA18844
VERIFY ADVISORY: http://secunia.com/advisories/18844/
CRITICAL: Less critical
IMPACT: Security Bypass
WHERE:
From local network
OPERATING SYSTEM: Fortinet FortiOS (FortiGate) 2.x http://secunia.com/product/2289/ Fortinet FortiOS (FortiGate) 3.x http://secunia.com/product/6802/
DESCRIPTION: Mathieu Dessus has reported two vulnerabilities in FortiGate, which can be exploited by malicious people and users to bypass certain security restrictions.
1) The URL blocking functionality can be bypassed by specially-crafted HTTP requests that are terminated by the CR character instead of the CRLF characters. It is also possible to bypass the functionality via a HTTP/1.0 request with no host header.
The vulnerability has been reported in FortiOS v2.8MR10 and v3beta.
2) The virus scanning functionality can be bypassed when sending files over FTP under certain conditions.
The vulnerability has been reported in FortiOS v2.8MR10 and v3beta.
SOLUTION: Do not rely on URL blocking as the only means of blocking users' access. Desktop-based on-access virus scanners should be used together with server-based virus scanners.
PROVIDED AND/OR DISCOVERED BY: Mathieu Dessus
ORIGINAL ADVISORY: http://lists.grok.org.uk/pipermail/full-disclosure/2006-February/042139.html http://lists.grok.org.uk/pipermail/full-disclosure/2006-February/042140.html
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
Subscribe: http://secunia.com/secunia_security_advisories/
Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/
Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor.
Unsubscribe: Secunia Security Advisories http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org
Show details on source website
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