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Ubuntu 16.04 ESM: USN-5090-2 Critical: Apache HTTP Server Denial Of Service

ubuntu
Calendar Grey September 27, 2021
Dist Ubuntu Esm H88
Discover details regarding Ubuntu USN-5090-2 which tackles urgent security vulnerabilities in apache2, particularly those related to denial of service risks.
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:

USN-5090-1 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

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)

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 forwa...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical issue Ubuntu apache2

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+esm2
  apache2-bin                     2.4.18-2ubuntu3.17+esm2

Ubuntu 14.04 ESM:
  apache2                         2.4.7-1ubuntu4.22+esm2
  apache2-bin                     2.4.7-1ubuntu4.22+esm2

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

References

https://ubuntu.com/security/notices/USN-5090-2

https://ubuntu.com/security/notices/USN-5090-1

CVE-2021-34798, 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 critical issue Ubuntu apache2

Package Information

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