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Ubuntu Security Notice USN-5126-1

Ubuntu Security Notice USN-5126-1
Posted Oct 29, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5126-1 - Kishore Kumar Kothapalli discovered that Bind incorrectly handled the lame cache when processing responses. A remote attacker could possibly use this issue to cause Bind to consume resources, resulting in a denial of service.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2021-25219
SHA-256 | e833f7be44ded6cc531922bda9b1bff7df784334df711599764ef0c073a52ab0

Ubuntu Security Notice USN-5126-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5126-1
October 28, 2021

bind9 vulnerability
==========================================================================

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:

Bind could be made to consume resources if it received specially crafted
network traffic.

Software Description:
- bind9: Internet Domain Name Server

Details:

Kishore Kumar Kothapalli discovered that Bind incorrectly handled the lame
cache when processing responses. A remote attacker could possibly use this
issue to cause Bind to consume resources, resulting in a denial of service.

Update instructions:

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

Ubuntu 21.10:
bind9 1:9.16.15-1ubuntu1.1

Ubuntu 21.04:
bind9 1:9.16.8-1ubuntu3.2

Ubuntu 20.04 LTS:
bind9 1:9.16.1-0ubuntu2.9

Ubuntu 18.04 LTS:
bind9 1:9.11.3+dfsg-1ubuntu1.16

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

References:
https://ubuntu.com/security/notices/USN-5126-1
CVE-2021-25219

Package Information:
https://launchpad.net/ubuntu/+source/bind9/1:9.16.15-1ubuntu1.1
https://launchpad.net/ubuntu/+source/bind9/1:9.16.8-1ubuntu3.2
https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.9
https://launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.16
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