HTTP response splitting in Apache HTTP Server - CVE-2023-27522

Vulnerability identifier: #VU73106

CSH Severity: Medium

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-27522

CWE-ID: CWE-113

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to software does not correclty process CRLF character sequences in mod_proxy_uwsgi. A remote attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

Apache HTTP Server
Gentoo Linux
Debian Linux
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
Oracle Linux
Amazon Linux AMI
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE CaaS Platform
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Enterprise Storage
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Oracle Solaris
Slackware Linux
SUSE Linux Enterprise Server 15 SP1 LTSS
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP3 LTSS
Server Applications Module
SUSE Package Hub 15
Basesystem Module
openSUSE Leap
Ubuntu
openEuler
Fedora
Cloud Pak for Network Automation
IBM Business Automation Manager Open Editions
HP-UX
IBM Cloud Pak for Watson AIOps
Maximo Application Suite - IoT Component
NetWorker Management Console (NMC)
OpenShift Logging
Dell Secure Connect Gateway
IBM Rational Build Forge
Tenable.sc
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
jbcs-httpd24-mod_proxy_cluster (Red Hat package)
jbcs-httpd24-apr-util (Red Hat package)
jbcs-httpd24-apr (Red Hat package)
mod_http2
mod_http2 (Red Hat package)
jbcs-httpd24-mod_http2 (Red Hat package)
mod_md
jbcs-httpd24-mod_md (Red Hat package)
apache2 (Ubuntu package)
apache2
apache2-doc
apache2-utils-debuginfo
apache2-worker-debuginfo
apache2-debugsource
apache2-worker
apache2-utils
apache2-devel
apache2-prefork
apache2-prefork-debuginfo
apache2-debuginfo
mod_ldap
httpd-tools
httpd-filesystem
httpd-devel
httpd
httpd-manual
mod_proxy_html
mod_session
mod_ssl
httpd-help
httpd-debuginfo
httpd-debugsource
apache2-example-pages
apache2-event-debuginfo
apache2-event
httpd (Red Hat package)
www-servers/apache
apache2 (Debian package)
httpd24
jbcs-httpd24-httpd (Red Hat package)
jbcs-httpd24-mod_security (Red Hat package)
jbcs-httpd24-curl (Red Hat package)
JBoss Core Services
Red Hat OpenShift Container Platform

Install updates from vendor's website.

Apache HTTP Server - update to 2.4.56
OpenShift Logging - update to 5.8.1
Dell Secure Connect Gateway - update to 5.16
Tenable.sc - update to 6.1.0
IBM Rational Build Forge - update to 8.0.0.24
IBM Business Automation Manager Open Editions - update to 9.0.1
jbcs-httpd24-mod_proxy_cluster (Red Hat package) - addressed in versions 1.3.19-4.el7jbcs, 1.3.19-4.el8jbcs
jbcs-httpd24-apr-util (Red Hat package) - addressed in versions 1.6.1-102.el7jbcs, 1.6.1-102.el8jbcs
jbcs-httpd24-apr (Red Hat package) - addressed in versions 1.7.0-8.el7jbcs, 1.7.0-8.el8jbcs
mod_http2 - update to 1.15.7-5
mod_http2 (Red Hat package) - update to 1.15.19-5.el9
jbcs-httpd24-mod_http2 (Red Hat package) - addressed in versions 1.15.19-28.el7jbcs, 1.15.19-28.el8jbcs
mod_md - update to 2.0.8-8
jbcs-httpd24-mod_md (Red Hat package) - addressed in versions 2.4.0-25.el7jbcs, 2.4.0-25.el8jbcs
apache2 (Ubuntu package) - addressed in versions 2.4.29-1ubuntu4.27, 2.4.41-4ubuntu3.14, 2.4.52-1ubuntu4.4, 2.4.54-2ubuntu1.2
apache2 - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-doc - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-utils-debuginfo - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-worker-debuginfo - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-debugsource - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-worker - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-utils - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-devel - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-prefork - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-prefork-debuginfo - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-debuginfo - addressed in versions 2.4.33-150000.3.75.1, 2.4.51-35.25.1, 2.4.51-150200.3.56.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
mod_ldap - update to 2.4.37-51.0.2
httpd-tools - update to 2.4.37-51.0.2
httpd-filesystem - update to 2.4.37-51.0.2
httpd-devel - update to 2.4.37-51.0.2
httpd - update to 2.4.37-51.0.2
httpd-manual - update to 2.4.37-51.0.2
mod_proxy_html - update to 2.4.37-51.0.2
mod_session - update to 2.4.37-51.0.2
mod_ssl - update to 2.4.37-51.0.2
httpd-help - update to 2.4.43-21
httpd-filesystem - update to 2.4.43-21
httpd-debuginfo - update to 2.4.43-21
mod_proxy_html - update to 2.4.43-21
mod_ldap - update to 2.4.43-21
httpd-debugsource - update to 2.4.43-21
httpd-tools - update to 2.4.43-21
mod_ssl - update to 2.4.43-21
mod_session - update to 2.4.43-21
httpd-devel - update to 2.4.43-21
httpd - update to 2.4.43-21
mod_md - update to 2.4.43-21
apache2-example-pages - addressed in versions 2.4.51-35.25.1, 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-event-debuginfo - addressed in versions 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
apache2-event - addressed in versions 2.4.51-150400.6.11.1, 2.4.66-150400.6.57.1
httpd (Red Hat package) - addressed in versions 2.4.53-11.el9_2.6, 2.4.57-5.el9
httpd - update to 2.4.56
www-servers/apache - update to 2.4.56
httpd - update to 2.4.56-1
httpd - addressed in versions 2.4.56-1.fc36, 2.4.56-1.fc37, 2.4.56-1.fc38
apache2 (Debian package) - update to 2.4.56-1~deb11u1
httpd24 - update to 2.4.56-1.100
JBoss Core Services - update to 2.4.57
jbcs-httpd24-httpd (Red Hat package) - addressed in versions 2.4.57-5.el7jbcs, 2.4.57-5.el8jbcs
jbcs-httpd24-mod_security (Red Hat package) - addressed in versions 2.9.3-29.el7jbcs, 2.9.3-29.el8jbcs
IBM Cloud Pak for Watson AIOps - update to 4.2.1
Red Hat OpenShift Container Platform - addressed in versions 4.12.61, 4.13.46
jbcs-httpd24-curl (Red Hat package) - addressed in versions 8.2.1-1.el7jbcs, 8.2.1-1.el8jbcs
Maximo Application Suite - IoT Component - addressed in versions 8.7.20, 8.8.16, 9.0.6
NetWorker Management Console (NMC) - update to 19.9.0.1

• https://httpd.apache.org/security/vulnerabilities_24.html

• HTTP response splitting vulnerabilities in Apache HTTP Server
• Slackware Linux update for httpd
• Ubuntu update for apache2
• SUSE update for apache2
• SUSE update for apache2
• Multiple vulnerabilities in Tenable.sc
• Amazon Linux AMI update for httpd24
• Debian update for apache2
• SUSE update for apache2
• SUSE update for apache2
• Multiple vulnerabilities in Oracle Solaris third-party software
• Multiple vulnerabilities in Dell Secure Connect Gateway
• Multiple vulnerabilities in Dell NetWorker Management Console (NMC)
• Multiple vulnerabilities in Red Hat JBoss Core Services
• Fedora 36 update for httpd
• Fedora 38 update for httpd
• Fedora 37 update for httpd
• Gentoo update for Apache HTTPD
• Red Hat Enterprise Linux 8.6 Extended Update Support update for the httpd:2.4 module
• Red Hat Enterprise Linux 8 update for the httpd:2.4 module
• Multiple vulnerabilities in IBM Cloud Pak for Watson AIOps
• Multiple vulnerabilities in IBM Rational Build Forge
• Red Hat Enterprise Linux 9 update for httpd and mod_http2
• Multiple vulnerabilities in IBM Business Automation Manager Open Editions
• Multiple vulnerabilities in Oracle Linux
• Multiple vulnerabilities in Logging Subsystem 5.8 for Red Hat OpenShift
• Multiple vulnerabilities in IBM Cloud Pak for Network Automation
• HP-UX update for Apache Web Server
• openEuler update for httpd
• Red Hat Enterprise Linux 9 update for httpd
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.12
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.13
• Amazon Linux AMI update for httpd
• Multiple vulnerabilities in IBM Maximo Application Suite - IoT Component
• Anolis OS update for httpd:2.4 module
• SUSE update for apache2