var-200602-0404
Vulnerability from variot

The frag3 preprocessor in Sourcefire Snort 2.4.3 does not properly reassemble certain fragmented packets with IP options, which allows remote attackers to evade detection of certain attacks, possibly related to IP option lengths. Snort is reportedly prone to a vulnerability that may allow malicious packets to bypass detection. Reports indicate that the Frag3 preprocessor fails to properly analyze certain packets. A successful attack can allow attackers to bypass intrusion detection and to carry out attacks against computers protected by Snort. This vulnerability affects Snort 2.4.3. Other versions may be vulnerable as well.

TITLE: Snort frag3 Preprocessor Packet Reassembly Vulnerability

SECUNIA ADVISORY ID: SA18959

VERIFY ADVISORY: http://secunia.com/advisories/18959/

CRITICAL: Moderately critical

IMPACT: Security Bypass

WHERE:

From remote

SOFTWARE: Snort 2.4.x http://secunia.com/product/5691/

DESCRIPTION: siouxsie has reported a vulnerability in Snort, which potentially can be exploited by malicious people to bypass certain security restrictions.

The vulnerability has been reported in version 2.4.3.

SOLUTION: Filter potentially malicious fragmented IP packets with a firewall.

PROVIDED AND/OR DISCOVERED BY: siouxsie

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

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