A Bind security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, 20.10, and 21.04.
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Ubuntu Security Notice USN-4929-1
April 29, 2021
bind9 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.10
- 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:
Greg Kuechle discovered that Bind incorrectly handled certain incremental
zone updates. A remote attacker could possibly use this issue to cause Bind
to crash, resulting in a denial of service. (CVE-2021-25214)
Siva Kakarla discovered that Bind incorrectly handled certain DNAME
records. A remote attacker could possibly use this issue to cause Bind to
crash, resulting in a denial of service. (CVE-2021-25215)
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.
(CVE-2021-25216)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
bind9 1:9.16.8-1ubuntu3.1
Ubuntu 20.10:
bind9 1:9.16.6-3ubuntu1.2
Ubuntu 20.04 LTS:
bind9 1:9.16.1-0ubuntu2.8
Ubuntu 18.04 LTS:
bind9 1:9.11.3+dfsg-1ubuntu1.15
Ubuntu 16.04 LTS:
bind9 1:9.10.3.dfsg.P4-8ubuntu1.19
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4929-1
CVE-2021-25214, CVE-2021-25215, CVE-2021-25216
Package Information:
https://launchpad.net/ubuntu/+source/bind9/1:9.16.8-1ubuntu3.1
https://launchpad.net/ubuntu/+source/bind9/1:9.16.6-3ubuntu1.2
https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.8
https://launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.15
https://launchpad.net/ubuntu/+source/bind9/1:9.10.3.dfsg.P4-8ubuntu1.19
