NULL pointer dereference in Apache HTTP Server - CVE-2020-13950

Vulnerability identifier: #VU53778

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-13950

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in mod_proxy_http. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Apache HTTP Server
Amazon Linux AMI
Gentoo Linux
IBM i
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Oracle Linux
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Slackware Linux
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Module for Server Applications
Ubuntu
openEuler
Fedora
jbcs-httpd24-openssl-pkcs11 (Red Hat package)
jbcs-httpd24-openssl-chil (Red Hat package)
jbcs-httpd24-apr-util (Red Hat package)
jbcs-httpd24-apr (Red Hat package)
jbcs-httpd24-mod_http2 (Red Hat package)
jbcs-httpd24-nghttp2 (Red Hat package)
jbcs-httpd24-mod_md (Red Hat package)
jbcs-httpd24-httpd (Red Hat package)
jbcs-httpd24-mod_security (Red Hat package)
jbcs-httpd24-curl (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
SUSE Linux Enterprise Module for Packagehub Subpackages
apache2 (Ubuntu package)
apache2-bin (Ubuntu package)
apache2-prefork-debuginfo
apache2-utils-debuginfo
apache2-utils
apache2-prefork
apache2
apache2-event-debuginfo
apache2-doc
apache2-event
apache2-debuginfo
apache2-debugsource
apache2-devel
apache2-worker
apache2-worker-debuginfo
mod_session
mod_ldap
httpd-debuginfo
httpd-debugsource
httpd-tools
httpd-devel
mod_md
mod_ssl
httpd
mod_proxy_html
httpd-help
httpd-filesystem
Cloud Pak for Security (CP4S)
JBoss Core Services
EasyApache
IBM Rational Build Forge
IBM Power Hardware Management Console (HMC)
IBM Hardware Management Console

Install updates from vendor's website.

Apache HTTP Server - update to 2.4.47
jbcs-httpd24-openssl-pkcs11 (Red Hat package) - addressed in versions 0.4.10-22.el8jbcs, 0.4.10-22.jbcs.el7
jbcs-httpd24-openssl-chil (Red Hat package) - addressed in versions 1.0.0-7.el8jbcs, 1.0.0-7.jbcs.el7
jbcs-httpd24-apr-util (Red Hat package) - addressed in versions 1.6.1-84.el8jbcs, 1.6.1-84.jbcs.el7
jbcs-httpd24-apr (Red Hat package) - addressed in versions 1.6.3-107.el8jbcs, 1.6.3-107.jbcs.el7
Cloud Pak for Security (CP4S) - update to 1.10.7.0
jbcs-httpd24-mod_http2 (Red Hat package) - addressed in versions 1.15.7-21.el8jbcs, 1.15.7-21.jbcs.el7
jbcs-httpd24-nghttp2 (Red Hat package) - addressed in versions 1.39.2-39.el8jbcs, 1.39.2-39.jbcs.el7
jbcs-httpd24-mod_md (Red Hat package) - addressed in versions 2.0.8-40.el8jbcs, 2.0.8-40.jbcs.el7
JBoss Core Services - update to 2.4.37 SP10
jbcs-httpd24-httpd (Red Hat package) - addressed in versions 2.4.37-78.el8jbcs, 2.4.37-78.jbcs.el7
jbcs-httpd24-mod_security (Red Hat package) - addressed in versions 2.9.2-67.GA.el8jbcs, 2.9.2-67.GA.jbcs.el7
EasyApache - update to 4 2021-6-2
jbcs-httpd24-curl (Red Hat package) - addressed in versions 7.78.0-2.el8jbcs, 7.78.0-2.jbcs.el7
IBM Rational Build Forge - update to 8.0.0.21
apache2 (Ubuntu package) - addressed in versions 2.4.29-1ubuntu4.16, 2.4.41-4ubuntu3.3, 2.4.46-1ubuntu1.2, 2.4.46-4ubuntu1.1
apache2-bin (Ubuntu package) - addressed in versions 2.4.29-1ubuntu4.16, 2.4.41-4ubuntu3.3, 2.4.46-1ubuntu1.2, 2.4.46-4ubuntu1.1
apache2-prefork-debuginfo - update to 2.4.43-3.22.1
apache2-utils-debuginfo - update to 2.4.43-3.22.1
apache2-utils - update to 2.4.43-3.22.1
apache2-prefork - update to 2.4.43-3.22.1
apache2 - update to 2.4.43-3.22.1
apache2-event-debuginfo - update to 2.4.43-3.22.1
apache2-doc - update to 2.4.43-3.22.1
apache2-event - update to 2.4.43-3.22.1
apache2-debuginfo - update to 2.4.43-3.22.1
apache2-debugsource - update to 2.4.43-3.22.1
apache2-devel - update to 2.4.43-3.22.1
apache2-worker - update to 2.4.43-3.22.1
apache2-worker-debuginfo - update to 2.4.43-3.22.1
mod_session - update to 2.4.43-7
mod_ldap - update to 2.4.43-7
httpd-debuginfo - update to 2.4.43-7
httpd-debugsource - update to 2.4.43-7
httpd-tools - update to 2.4.43-7
httpd-devel - update to 2.4.43-7
mod_md - update to 2.4.43-7
mod_ssl - update to 2.4.43-7
httpd - update to 2.4.43-7
mod_proxy_html - update to 2.4.43-7
httpd-help - update to 2.4.43-7
httpd-filesystem - update to 2.4.43-7
httpd - addressed in versions 2.4.49-1.fc34, 2.4.49-1.fc35
IBM Hardware Management Console - addressed in versions 9.2.950.0 SP3 ppc, 9.2.950.0 SP3 x86, 10.1.1020.0 SP1 ppc, 10.1.1020.0 SP1 x86
IBM Power Hardware Management Console (HMC) - addressed in versions 9.2.950.0 SP3, 10.1.1020.0 SP1

• https://downloads.apache.org/httpd/CHANGES_2.4.48

• Multiple vulnerabilities in Apache HTTP Server
• cPanel update for EasyApache
• Slackware Linux update for httpd
• Amazon Linux AMI update for httpd24
• Gentoo update for Apache
• Multiple vulnerabilities in Red Hat JBoss Core Services Apache HTTP Server
• SUSE update for apache2
• Ubuntu update for apache2
• Red Hat Enterprise Linux 8.6 update for the httpd:2.4 module
• Multiple vulnerabilities in Oracle Linux
• Multiple vulnerabilities in IBM i
• Denial of service in IBM Power Hardware Management Console (HMC) Apache HTTP server
• NULL pointer dereference in IBM Hardware Management Console
• Multiple vulnerabilities in IBM Cloud Pak for Security (CP4S)
• openEuler 20.03 LTS SP1 update for httpd
• Fedora 34 update for httpd
• Fedora 35 update for httpd
• Multiple vulnerabilities in IBM Rational Build Forge