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Ubuntu Security Notice USN-4737-1

Ubuntu Security Notice USN-4737-1
Posted Feb 18, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4737-1 - It was discovered that Bind incorrectly handled GSSAPI security policy negotiation. A remote attacker could use this issue to cause Bind to crash, resulting in a denial of service, or possibly execute arbitrary code. In the default installation, attackers would be isolated by the Bind AppArmor profile.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2020-8625
SHA-256 | 2bf46e97a6f3775a141176519c2d8406ecea005a42e0a840999b0f44e8d85446

Ubuntu Security Notice USN-4737-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4737-1
February 18, 2021

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

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Bind could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- bind9: Internet Domain Name Server

Details:

It was discovered that Bind incorrectly handled GSSAPI security policy
negotiation. A remote attacker could use this issue to cause Bind to crash,
resulting in a denial of service, or possibly execute arbitrary code. In
the default installation, attackers would be isolated by the Bind AppArmor
profile.

Update instructions:

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

Ubuntu 20.10:
bind9 1:9.16.6-3ubuntu1.1

Ubuntu 20.04 LTS:
bind9 1:9.16.1-0ubuntu2.6

Ubuntu 18.04 LTS:
bind9 1:9.11.3+dfsg-1ubuntu1.14

Ubuntu 16.04 LTS:
bind9 1:9.10.3.dfsg.P4-8ubuntu1.18

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

References:
https://usn.ubuntu.com/4737-1
CVE-2020-8625

Package Information:
https://launchpad.net/ubuntu/+source/bind9/1:9.16.6-3ubuntu1.1
https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.6
https://launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.14
https://launchpad.net/ubuntu/+source/bind9/1:9.10.3.dfsg.P4-8ubuntu1.18

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