Ubuntu Security Notice 5212-2 - USN-5212-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. 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.
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Ubuntu Security Notice USN-5212-2
January 10, 2022
apache2 vulnerabilities
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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:
https://ubuntu.com/security/notices/USN-5212-2
https://ubuntu.com/security/notices/USN-5212-1
CVE-2021-44224, CVE-2021-44790