Apache 2.4.x < 2.4.58 Multiple Vulnerabilities

high Nessus Plugin ID 183391

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Synopsis

The remote web server is affected by multiple vulnerabilities.

Description

The version of Apache httpd installed on the remote host is prior to 2.4.58. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.58 advisory.

- Apache HTTP Server: DoS in HTTP/2 with initial windows size 0: An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known slow loris attack pattern. This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Acknowledgements: (CVE-2023-43622)

- Apache HTTP Server: HTTP/2 stream memory not reclaimed right away on RST: When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy and open and causing the memory footprint to keep on growing. On connection close, all resources were reclaimed, but the process might run out of memory before that. This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid Reset Exploit) with their own test client. During normal HTTP/2 use, the probability to hit this bug is very low. The kept memory would not become noticeable before the connection closes or times out. Users are recommended to upgrade to version 2.4.58, which fixes the issue. Acknowledgements: (CVE-2023-45802)

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 2.4.58 or later.

Plugin Details

Severity: High

ID: 183391

File Name: apache_2_4_58.nasl

Version: 1.10

Type: combined

Agent: windows, macosx, unix

Family: Web Servers

Published: 10/19/2023

Updated: 4/29/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2023-43622

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

Required KB Items: installed_sw/Apache

Exploit Ease: No known exploits are available

Patch Publication Date: 10/19/2023

Vulnerability Publication Date: 9/15/2023

Reference Information

CVE: CVE-2023-43622, CVE-2023-45802

IAVA: 2023-A-0572-S

Detections

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