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FreeBSD : FreeBSD -- Resource exhaustion in TCP reassembly (3c2eea8c-99bf-11e8-8bee-a4badb2f4699)

medium Nessus Plugin ID 111561

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Synopsis

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

Description

One of the data structures that holds TCP segments uses an inefficient algorithm to reassemble the data. This causes the CPU time spent on segment processing to grow linearly with the number of segments in the reassembly queue. Impact : An attacker who has the ability to send TCP traffic to a victim system can degrade the victim system's network performance and/or consume excessive CPU by exploiting the inefficiency of TCP reassembly handling, with relatively small bandwidth cost.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?0fd6f72c

Plugin Details

Severity: Medium

ID: 111561

File Name: freebsd_pkg_3c2eea8c99bf11e88beea4badb2f4699.nasl

Version: 1.8

Type: local

Published: 8/7/2018

Updated: 12/7/2018

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

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

CVSS v3

Risk Factor: Medium

Base Score: 5.3

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

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: 8/6/2018

Vulnerability Publication Date: 8/6/2018

Reference Information

CVE: CVE-2018-6922

FreeBSD: SA-18:08.tcp