An Apache HTTP Server security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 21.04.
==========================================================================
Ubuntu Security Notice USN-5090-1
September 27, 2021
apache2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in Apache HTTP Server.
Software Description:
- apache2: Apache HTTP server
Details:
James Kettle discovered that the Apache HTTP Server HTTP/2 module
incorrectly handled certain crafted methods. A remote attacker could
possibly use this issue to perform request splitting or cache poisoning
attacks. (CVE-2021-33193)
It was discovered that the Apache HTTP Server incorrectly handled certain
malformed requests. A remote attacker could possibly use this issue to
cause the server to crash, resulting in a denial of service.
(CVE-2021-34798)
Li Zhi Xin discovered that the Apache mod_proxy_uwsgi module incorrectly
handled certain request uri-paths. A remote attacker could possibly use
this issue to cause the server to crash, resulting in a denial of service.
This issue only affected Ubuntu 20.04 LTS and Ubuntu 21.04.
(CVE-2021-36160)
It was discovered that the Apache HTTP Server incorrectly handled escaping
quotes. If the server was configured with third-party modules, a remote
attacker could use this issue to cause the server to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2021-39275)
It was discovered that the Apache mod_proxy module incorrectly handled
certain request uri-paths. A remote attacker could possibly use this issue
to cause the server to forward requests to arbitrary origin servers.
(CVE-2021-40438)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
apache2 2.4.46-4ubuntu1.2
apache2-bin 2.4.46-4ubuntu1.2
Ubuntu 20.04 LTS:
apache2 2.4.41-4ubuntu3.5
apache2-bin 2.4.41-4ubuntu3.5
Ubuntu 18.04 LTS:
apache2 2.4.29-1ubuntu4.17
apache2-bin 2.4.29-1ubuntu4.17
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5090-1
CVE-2021-33193, CVE-2021-34798, CVE-2021-36160, CVE-2021-39275,
CVE-2021-40438
Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.46-4ubuntu1.2
https://launchpad.net/ubuntu/+source/apache2/2.4.41-4ubuntu3.5
https://launchpad.net/ubuntu/+source/apache2/2.4.29-1ubuntu4.17
