USN-4929-1: Bind vulnerabilities

Releases

• Ubuntu 21.04
• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• 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

• bind9 - 1:9.16.1-0ubuntu2.8

Ubuntu 18.04

• bind9 - 1:9.11.3+dfsg-1ubuntu1.15

Ubuntu 16.04

• bind9 - 1:9.10.3.dfsg.P4-8ubuntu1.19

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

References

• CVE-2021-25215
• CVE-2021-25214
• CVE-2021-25216