[USN-5212-2] Apache HTTP Server vulnerabilities

========================================================================== Ubuntu Security Notice USN-5212-2 January 10, 2022
apache2 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 ESM – Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in Apache HTTP Server.
Software Description: – apache2: Apache HTTP server
Details:
USN-5212-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory 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 16.04 ESM: apache2 2.4.18-2ubuntu3.17+esm4 apache2-bin 2.4.18-2ubuntu3.17+esm4
Ubuntu 14.04 ESM: apache2 2.4.7-1ubuntu4.22+esm3 apache2-bin 2.4.7-1ubuntu4.22+esm3
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5212-2 ubuntu.com/security/notices/USN-5212-1 CVE-2021-44224, CVE-2021-44790