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

medium Nessus Plugin ID 92907

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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.

Solution

Update the affected packages.

Plugin Details

Severity: Medium

ID: 92907

File Name: freebsd_pkg_729c4a9f600711e6a6c314dae9d210b8.nasl

Version: 2.5

Type: local

Family: FreeBSD Local Security Checks

Published: 8/12/2016

Updated: 1/4/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/11/2016

Vulnerability Publication Date: 9/16/2014

Reference Information

CVE: CVE-2004-0230

BID: 10183

FreeBSD: SA-14:19.tcp

Detections

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