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Ubuntu 21.04 USN-5090-1 Severe: Apache HTTP Server Denial of Service

ubuntu
Calendar Grey September 27, 2021
Dist Ubuntu Esm H88
Multiple vulnerabilities addressed in Apache HTTP Server were resolved with Ubuntu Security Notice USN-5090-1 on September 27, 2021.
Several security issues were fixed in Apache HTTP Server.

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 ser...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu cache poisoning apache2 request splitting

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

Severity
critical
Lowest
Low
Medium
High
Critical

September 27, 2021

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu cache poisoning apache2 request splitting

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

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