Detections
Analytics

Azure Linux 3.0 Security Update: httpd / mod_http2 (CVE-2023-45802)

medium Nessus Plugin ID 236821

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-2023-45802 advisory.

 - 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. (CVE-2023-45802)

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-2023-45802

Plugin Details

Severity: Medium

ID: 236821

File Name: azure_linux_CVE-2023-45802.nasl

Version: 1.1

Type: local

Published: 5/16/2025

Updated: 5/16/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

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

CVSS Score Source: CVE-2023-45802

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: CVSS:3.0/E:U/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 Ease: No known exploits are available

Patch Publication Date: 5/13/2025

Vulnerability Publication Date: 10/19/2023

Reference Information

CVE: CVE-2023-45802