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CBL Mariner 2.0 Security Update: httpd / mod_http2 (CVE-2023-43622)

high Nessus Plugin ID 236824

Synopsis

The remote CBL Mariner host is missing one or more security updates.

Description

The version of httpd / mod_http2 installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2023-43622 advisory.

 - 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. (CVE-2023-43622)

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

Solution

Update the affected packages.

See Also

https://nvd.nist.gov/vuln/detail/CVE-2023-43622

Plugin Details

Severity: High

ID: 236824

File Name: mariner_CVE-2023-43622.nasl

Version: 1.1

Type: local

Published: 5/16/2025

Updated: 5/16/2025

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-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: p-cpe:/a:microsoft:cbl-mariner:mod_http2-debuginfo, p-cpe:/a:microsoft:cbl-mariner:httpd-devel, p-cpe:/a:microsoft:cbl-mariner:mod_ssl, p-cpe:/a:microsoft:cbl-mariner:mod_proxy_html, x-cpe:/o:microsoft:cbl-mariner, p-cpe:/a:microsoft:cbl-mariner:httpd-docs, p-cpe:/a:microsoft:cbl-mariner:mod_session, p-cpe:/a:microsoft:cbl-mariner:httpd-tools, p-cpe:/a:microsoft:cbl-mariner:httpd, p-cpe:/a:microsoft:cbl-mariner:mod_http2, p-cpe:/a:microsoft:cbl-mariner:mod_ldap, p-cpe:/a:microsoft:cbl-mariner:httpd-debuginfo

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/CBLMariner/release, Host/CBLMariner/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 5/13/2025

Vulnerability Publication Date: 10/19/2023

Reference Information

CVE: CVE-2023-43622