=========================================================================Ubuntu Security Notice USN-5212-1
January 06, 2022

apache2 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- 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:

It was discovered that the Apache HTTP Server incorrectly handled certain
forward proxy requests. A remote attacker could use this issue to cause
the server to crash, resulting in a denial of service, or possibly perform
a Server Side Request Forgery attack. (CVE-2021-44224)

It was discovered that the Apache HTTP Server Lua module incorrectly
handled memory in the multipart parser. 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-2021-44790)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.10:
  apache2                         2.4.48-3.1ubuntu3.2
  apache2-bin                     2.4.48-3.1ubuntu3.2

Ubuntu 21.04:
  apache2                         2.4.46-4ubuntu1.5
  apache2-bin                     2.4.46-4ubuntu1.5

Ubuntu 20.04 LTS:
  apache2                         2.4.41-4ubuntu3.9
  apache2-bin                     2.4.41-4ubuntu3.9

Ubuntu 18.04 LTS:
  apache2                         2.4.29-1ubuntu4.21
  apache2-bin                     2.4.29-1ubuntu4.21

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5212-1
  CVE-2021-44224, CVE-2021-44790

Package Information:
  https://launchpad.net/ubuntu/+source/apache2/2.4.48-3.1ubuntu3.2
  https://launchpad.net/ubuntu/+source/apache2/2.4.46-4ubuntu1.5
  https://launchpad.net/ubuntu/+source/apache2/2.4.41-4ubuntu3.9
  https://launchpad.net/ubuntu/+source/apache2/2.4.29-1ubuntu4.21