FreeBSD : FreeBSD -- Denial of Service in TCP packet processing (729c4a9f-6007-11e6-a6c3-14dae9d210b8)

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing one or more security-related
updates.

Description :

When a segment with the SYN flag for an already existing connection
arrives, the TCP stack tears down the connection, bypassing a check
that the sequence number in the segment is in the expected window.
Impact : An attacker who has the ability to spoof IP traffic can tear
down a TCP connection by sending only 2 packets, if they know both TCP
port numbers. In case one of the two port numbers is unknown, a
successful attack requires less than 2**17 packets spoofed, which can
be generated within less than a second on a decent connection to the
Internet.

See also :

http://www.nessus.org/u?cadfa2c1

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.3
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 92907 ()

Bugtraq ID: 10183

CVE ID: CVE-2004-0230

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