Detections
Analytics

Azure Linux 3.0 Security Update: httpd / mod_http2 (CVE-2023-25690)

critical Nessus Plugin ID 236823

Synopsis

The remote Azure Linux host is missing one or more security updates.

Description

The version of httpd / mod_http2 installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2023-25690 advisory.

 - Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack. Configurations are affected when mod_proxy is enabled along with some form of RewriteRule or ProxyPassMatch in which a non-specific pattern matches some portion of the user-supplied request-target (URL) data and is then re-inserted into the proxied request-target using variable substitution. For example, something like: RewriteEngine on RewriteRule ^/here/(.*) http://example.com:8080/elsewhere?$1; [P] ProxyPassReverse /here/ http://example.com:8080/ Request splitting/smuggling could result in bypass of access controls in the proxy server, proxying unintended URLs to existing origin servers, and cache poisoning. Users are recommended to update to at least version 2.4.56 of Apache HTTP Server. (CVE-2023-25690)

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-2023-25690

Plugin Details

Severity: Critical

ID: 236823

File Name: azure_linux_CVE-2023-25690.nasl

Version: 1.1

Type: local

Published: 5/16/2025

Updated: 5/16/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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

CVSS Score Source: CVE-2023-25690

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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:P/RL:O/RC:C

Vulnerability Information

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/13/2025

Vulnerability Publication Date: 3/7/2023

Reference Information

CVE: CVE-2023-25690