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Amazon Linux 2023 : httpd, httpd-core, httpd-devel (ALAS2023-2026-1720)

critical Nessus Plugin ID 316833

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1720 advisory.

 An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess authors to read files with the privileges of the httpd user.

 Users are recommended to upgrade to version 2.4.67, which fixes this issue. (CVE-2026-24072)

 Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server.If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

 This issue affects Apache HTTP Server: through 2.4.66.

 Users are recommended to upgrade to version 2.4.67, which fixes the issue. (CVE-2026-28780)

 Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data.

 This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.

 Users are recommended to upgrade to version 2.4.67, which fixes the issue. (CVE-2026-29168)

 A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.

 The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0.

 Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.
 (CVE-2026-29169)

 A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker.

 Users are recommended to upgrade to version 2.4.67, which fixes this issue. (CVE-2026-33006)

 A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an unauthenticated remote user to crash a child process in a caching forward proxy configuration.

 Users are recommended to upgrade to version 2.4.67, which fixes this issue. (CVE-2026-33007)

 HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers.

 This issue affects Apache HTTP Server: from through 2.4.66.

 Users are recommended to upgrade to version 2.4.67, which fixes the issue. (CVE-2026-33523)

 Out-of-bounds Read vulnerability in mod_proxy_ajp of

 Apache HTTP Server.

 This issue affects Apache HTTP Server: through 2.4.66.

 Users are recommended to upgrade to version 2.4.67, which fixes the issue. (CVE-2026-33857)

 Improper Null Termination, Out-of-bounds Read vulnerability in Apache HTTP Server.

 This issue affects Apache HTTP Server: through 2.4.66.

 Users are recommended to upgrade to version 2.4.67, which fixes the issue. (CVE-2026-34032)

 Buffer Over-read vulnerability in Apache HTTP Server.

 This issue affects Apache HTTP Server: through 2.4.66.

 Users are recommended to upgrade to version 2.4.67, which fixes the issue. (CVE-2026-34059)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1720.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-24072.html

https://explore.alas.aws.amazon.com/CVE-2026-28780.html

https://explore.alas.aws.amazon.com/CVE-2026-29168.html

https://explore.alas.aws.amazon.com/CVE-2026-29169.html

https://explore.alas.aws.amazon.com/CVE-2026-33006.html

https://explore.alas.aws.amazon.com/CVE-2026-33007.html

https://explore.alas.aws.amazon.com/CVE-2026-33523.html

https://explore.alas.aws.amazon.com/CVE-2026-33857.html

https://explore.alas.aws.amazon.com/CVE-2026-34032.html

https://explore.alas.aws.amazon.com/CVE-2026-34059.html

Plugin Details

Severity: Critical

ID: 316833

File Name: al2023_ALAS2023-2026-1720.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/26/2026

Updated: 5/26/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, 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-2026-28780

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:amazon:linux:httpd, p-cpe:/a:amazon:linux:httpd-debuginfo, p-cpe:/a:amazon:linux:httpd-devel, p-cpe:/a:amazon:linux:httpd-filesystem, p-cpe:/a:amazon:linux:httpd-manual, p-cpe:/a:amazon:linux:httpd-tools, p-cpe:/a:amazon:linux:mod_ldap, p-cpe:/a:amazon:linux:mod_proxy_html, p-cpe:/a:amazon:linux:mod_session, p-cpe:/a:amazon:linux:mod_ssl, p-cpe:/a:amazon:linux:httpd-debugsource, p-cpe:/a:amazon:linux:httpd-tools-debuginfo, p-cpe:/a:amazon:linux:mod_ldap-debuginfo, p-cpe:/a:amazon:linux:mod_lua, p-cpe:/a:amazon:linux:mod_lua-debuginfo, p-cpe:/a:amazon:linux:mod_proxy_html-debuginfo, p-cpe:/a:amazon:linux:mod_session-debuginfo, p-cpe:/a:amazon:linux:mod_ssl-debuginfo, p-cpe:/a:amazon:linux:httpd-core, p-cpe:/a:amazon:linux:httpd-core-debuginfo, cpe:/o:amazon:linux:2023

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/25/2026

Vulnerability Publication Date: 5/4/2026

Reference Information

CVE: CVE-2026-24072, CVE-2026-28780, CVE-2026-29168, CVE-2026-29169, CVE-2026-33006, CVE-2026-33007, CVE-2026-33523, CVE-2026-33857, CVE-2026-34032, CVE-2026-34059