FreeBSD : FreeBSD -- Resource exhaustion in IP fragment reassembly (359e1548-a652-11e8-805b-a4badb2f4699)

high Nessus Plugin ID 112070

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Synopsis

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

Description

A researcher has notified us of a DoS attack applicable to another operating system. While FreeBSD may not be vulnerable to that exact attack, we have identified several places where inadequate DoS protection could allow an attacker to consume system resources.

It is not necessary that the attacker be able to establish two-way communication to carry out these attacks. These attacks impact both IPv4 and IPv6 fragment reassembly. Impact : In the worst case, an attacker could send a stream of crafted fragments with a low packet rate which would consume a substantial amount of CPU.

Other attack vectors allow an attacker to send a stream of crafted fragments which could consume a large amount of CPU or all available mbuf clusters on the system.

These attacks could temporarily render a system unreachable through network interfaces or temporarily render a system unresponsive. The effects of the attack should clear within 60 seconds after the attack stops.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 112070

File Name: freebsd_pkg_359e1548a65211e8805ba4badb2f4699.nasl

Version: 1.5

Type: local

Family: FreeBSD Local Security Checks

Published: 8/23/2018

Updated: 8/15/2024

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

Temporal Score: 5.8

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

CVSS Score Source: CVE-2018-6923

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/22/2018

Vulnerability Publication Date: 8/14/2018

Reference Information

CVE: CVE-2018-6923

FreeBSD: SA-18:10.ip

Detections

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