USN-4468-1: Bind vulnerabilities
==========================================================================
Ubuntu Security Notice USN-4468-1
August 21, 2020
bind9 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Bind.
Software Description:
- bind9: Internet Domain Name Server
Details:
Emanuel Almeida discovered that Bind incorrectly handled certain TCP
payloads. A remote attacker could possibly use this issue to cause Bind to
crash, resulting in a denial of service. This issue only affected Ubuntu
20.04 LTS. (CVE-2020-8620)
Joseph Gullo discovered that Bind incorrectly handled QNAME minimization
when used in certain configurations. A remote attacker could possibly use
this issue to cause Bind to crash, resulting in a denial of service. This
issue only affected Ubuntu 20.04 LTS. (CVE-2020-8621)
Dave Feldman, Jeff Warren, and Joel Cunningham discovered that Bind
incorrectly handled certain truncated responses to a TSIG-signed request. A
remote attacker could possibly use this issue to cause Bind to crash,
resulting in a denial of service. (CVE-2020-8622)
Lyu Chiy discovered that Bind incorrectly handled certain queries. A remote
attacker could possibly use this issue to cause Bind to crash, resulting in
a denial of service. (CVE-2020-8623)
Joop Boonen discovered that Bind incorrectly handled certain subdomain
update-policy rules. A remote attacker granted privileges to change certain
parts of a zone could use this issue to change other contents of the zone,
contrary to expectations. This issue only affected Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2020-8624)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS:
bind9 1:9.16.1-0ubuntu2.3
Ubuntu 18.04 LTS:
bind9 1:9.11.3+dfsg-1ubuntu1.13
Ubuntu 16.04 LTS:
bind9 1:9.10.3.dfsg.P4-8ubuntu1.17
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4468-1
CVE-2020-8620, CVE-2020-8621, CVE-2020-8622, CVE-2020-8623,
CVE-2020-8624
Package Information:
https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.3
https://launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.13
https://launchpad.net/ubuntu/+source/bind9/1:9.10.3.dfsg.P4-8ubuntu1.17
A Bind security update has been released for Ubuntu Linux 20.04 LTS, 18.04 LTS, and 16.04 LTS.
