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Ubuntu Security Notice USN-5126-2

Ubuntu Security Notice USN-5126-2
Posted Oct 29, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5126-2 - USN-5126-1 fixed a vulnerability in Bind. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2021-25219
SHA-256 | 84bfe5f035a07b28c524d5511207a27c943a510340e420ed5c2d0481add22b33

Ubuntu Security Notice USN-5126-2

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-5126-2
October 28, 2021

bind9 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

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

Software Description:
- bind9: Internet Domain Name Server

Details:

USN-5126-1 fixed a vulnerability in Bind. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory 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 16.04 ESM:
bind9 1:9.10.3.dfsg.P4-8ubuntu1.19+esm1

Ubuntu 14.04 ESM:
bind9 1:9.9.5.dfsg-3ubuntu0.19+esm5

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

References:
https://ubuntu.com/security/notices/USN-5126-2
https://ubuntu.com/security/notices/USN-5126-1
CVE-2021-25219
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