Apache 2.4.x < 2.4.35 DoS

medium Nessus Plugin ID 117807

Synopsis

The remote web server is affected by a denial of service vulnerability.

Description

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.35. It is, therefore, affected by the following vulnerability:

- By sending continuous SETTINGS frames of maximum size an ongoing HTTP/2 connection could be kept busy and would never time out. This can be abused for a DoS on the server. This only affect a server that has enabled the h2 protocol.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Apache version 2.4.35 or later.

See Also

https://archive.apache.org/dist/httpd/CHANGES_2.4.35

https://httpd.apache.org/security/vulnerabilities_24.html#2.4.35

Plugin Details

Severity: Medium

ID: 117807

File Name: apache_2_4_35.nasl

Version: 1.8

Type: combined

Agent: windows, macosx, unix

Family: Web Servers

Published: 9/27/2018

Updated: 4/11/2022

Configuration: Enable thorough checks

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2018-11763

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: cpe:/a:apache:http_server, cpe:/a:apache:httpd

Required KB Items: installed_sw/Apache

Exploit Ease: No known exploits are available

Patch Publication Date: 9/25/2018

Vulnerability Publication Date: 9/25/2018

Reference Information

CVE: CVE-2018-11763