Nessus Plugin #12118

Plugin Index

Note: This file has been created from a downloaded version of the Nessus Plugins from http://www.nessus.org/. Therefore, the information here can be outdated.

Firewall ECE-bit bypass

Family:

Misc.

Category:

infos

Copyright:

This script is Copyright (C) 2004 Andrey I. Zakharov and John Lampe

Summary:

Firewall ECE-bit bypass

Version:

$Revision: 1.5 $

Cve_id:

CVE-2001-0183

Bugtraq_id:

2293

Xrefs:

-

Description:

The remote host seems vulnerable to a bug wherein a remote
attacker can circumvent the firewall by setting the ECE bit
within the TCP flags field. At least one firewall (ipfw) is
known to exhibit this sort of behavior.

Known vulnerable systems include all FreeBSD 3.x ,4.x, 3.5-STABLE,
and 4.2-STABLE.

Solution: If you are running FreeBSD 3.X, 4.x, 3.5-STABLE,
4.2-STABLE, upgrade your firewall. If you are not running FreeBSD,
contact your firewall vendor for a patch.

See also: http://www.securityfocus.com/bid/2293/
Risk Factor: High