Apache 2.4.x >= 2.4.7 / < 2.4.52 Forward Proxy DoS / SSRF

critical Nessus Plugin ID 156255

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Synopsis

The remote web server is affected by a denial of service or server-side request forgery vulnerability.

Description

The version of Apache httpd installed on the remote host is equal to or greater than 2.4.7 and prior to 2.4.52.
It is, therefore, affected by a flaw related to acting as a forward proxy.

A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery).

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

Solution

Upgrade to Apache version 2.4.52 or later.

Plugin Details

Severity: Critical

ID: 156255

File Name: apache_2_4_52.nasl

Version: 1.10

Type: combined

Agent: windows, macosx, unix

Family: Web Servers

Published: 12/23/2021

Updated: 11/22/2023

Configuration: Enable thorough checks

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

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.2

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

CVSS Score Source: CVE-2021-44790

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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

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

Vulnerability Information

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

Required KB Items: installed_sw/Apache

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/20/2021

Vulnerability Publication Date: 11/18/2021

Reference Information

CVE: CVE-2021-44224, CVE-2021-44790

IAVA: 2021-A-0604-S

Detections

Analytics