NULL pointer dereference in Apache HTTP Server - CVE-2021-26690

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Main Vulnerability Database Vulnerabilities #VU53777

NULL pointer dereference in Apache HTTP Server - CVE-2021-26690

Published: June 3, 2021


Vulnerability identifier: #VU53777
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-2021-26690
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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_session. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.


Affected software

Apache HTTP Server
ClevOS
Gentoo Linux
Amazon Linux AMI
SUSE CaaS Platform
SUSE Manager Server
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Enterprise Storage
SUSE OpenStack Cloud Crowbar
SUSE OpenStack Cloud
HPE Helion Openstack
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Software Development Kit
Slackware Linux
Ubuntu
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Server Applications
SUSE Linux Enterprise Module for Basesystem
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)
apache2 (Debian package)
jbcs-httpd24-httpd (Red Hat package)
jbcs-httpd24-mod_security (Red Hat package)
jbcs-httpd24-curl (Red Hat package)
SUSE Linux Enterprise Module for Packagehub Subpackages
apache2-debugsource
apache2-debuginfo
apache2-utils-debuginfo
apache2
apache2-doc
apache2-example-pages
apache2-prefork
apache2-prefork-debuginfo
apache2-utils
apache2-devel
apache2-worker-debuginfo
apache2-worker
apache2-bin (Ubuntu package)
apache2 (Ubuntu package)
apache2-event-debuginfo
apache2-event
mod_session
mod_proxy_html
httpd-filesystem
httpd
mod_md
httpd-debugsource
httpd-help
mod_ssl
httpd-debuginfo
httpd-devel
mod_ldap
httpd-tools
JBoss Core Services
EasyApache
Dell Secure Connect Gateway
IBM Rational Build Forge
Maximo Application Suite - IoT Component

How to mitigate CVE-2021-26690

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
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
apache2 (Debian package) - update to 2.4.38-3+deb10u5
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
Dell Secure Connect Gateway - update to 5.12.00.10
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-debugsource - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-debuginfo - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-utils-debuginfo - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2 - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-doc - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-example-pages - update to 2.4.23-29.74.1
apache2-prefork - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-prefork-debuginfo - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-utils - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-devel - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-worker-debuginfo - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
apache2-worker - addressed in versions 2.4.23-29.74.1, 2.4.33-3.50.1, 2.4.43-3.22.1
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, 2.4.182ubuntu3.17+esm1
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, 2.4.182ubuntu3.17+esm1
apache2-event-debuginfo - update to 2.4.43-3.22.1
apache2-event - update to 2.4.43-3.22.1
mod_session - update to 2.4.43-8
mod_proxy_html - update to 2.4.43-8
httpd-filesystem - update to 2.4.43-8
httpd - update to 2.4.43-8
mod_md - update to 2.4.43-8
httpd-debugsource - update to 2.4.43-8
httpd-help - update to 2.4.43-8
mod_ssl - update to 2.4.43-8
httpd-debuginfo - update to 2.4.43-8
httpd-devel - update to 2.4.43-8
mod_ldap - update to 2.4.43-8
httpd-tools - update to 2.4.43-8
httpd - addressed in versions 2.4.49-1.fc34, 2.4.49-1.fc35
Maximo Application Suite - IoT Component - addressed in versions 8.7.20, 8.8.16, 9.0.6

External References

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