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

high Nessus Plugin ID 92918

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Synopsis

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

Description

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.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?20307eb8

Plugin Details

Severity: High

ID: 92918

File Name: freebsd_pkg_79dfc135600a11e6a6c314dae9d210b8.nasl

Version: 2.5

Type: local

Published: 8/12/2016

Updated: 1/4/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS v3

Risk Factor: High

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, cpe:/o:freebsd:freebsd

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

Patch Publication Date: 8/11/2016

Vulnerability Publication Date: 1/14/2016

Reference Information

CVE: CVE-2016-1882

FreeBSD: SA-16:05.tcp