FreeBSD : FreeBSD -- TCP MD5 signature denial of service (79dfc135-600a-11e6-a6c3-14dae9d210b8)

High Nessus Plugin ID 92918


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


A programming error in processing a TCP connection with both TCP_MD5SIG and TCP_NOOPT socket options may lead to kernel crash.
Impact : A local attacker can crash the kernel, resulting in a denial-of-service.

A remote attack is theoretically possible, if server has a listening socket with TCP_NOOPT set, and server is either out of SYN cache entries, or SYN cache is disabled by configuration.


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 92918

File Name: freebsd_pkg_79dfc135600a11e6a6c314dae9d210b8.nasl

Version: $Revision: 2.2 $

Type: local

Published: 2016/08/12

Modified: 2016/10/19

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.8

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


Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

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

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

Patch Publication Date: 2016/08/11

Vulnerability Publication Date: 2016/01/14

Reference Information

CVE: CVE-2016-1882

FreeBSD: SA-16:05.tcp