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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


Home >> Browse Vulnerability Assessment Database >> Firewalls >> Remote host replies to SYN+FIN


Vulnerability Assessment Details

Remote host replies to SYN+FIN

Vulnerability Assessment Summary
Sends a SYN+FIN packet and expects a SYN+ACK

Detailed Explanation for this Vulnerability Assessment

Summary :

It may be possible to bypass firewall rules

Description :

The remote host does not discard TCP SYN packets which have
the FIN flag set.

Depending on the kind of firewall you are using, a possible hacker
may use this flaw to bypass its rules.

See also :

http://archives.neohapsis.com/archives/bugtraq/2002-10/0266.html
http://www.kb.cert.org/vuls/id/464113

Solution :

Contact your vendor for a patch

Network Security Threat Level:

None / CVSS Base Score : 0
(AV:R/AC:L/Au:NR/C:N/A:N/I:N/B:N)

Networks Security ID: 7487

Vulnerability Assessment Copyright: This script is Copyright (C) 2003 Tenable Network Security

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