USN-5332-2: Bind vulnerability

Releases

• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• bind9 - Internet Domain Name Server

Details

USN-5332-1 fixed a vulnerability in Bind. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Xiang Li, Baojun Liu, Chaoyi Lu, and Changgen Zou discovered that Bind
incorrectly handled certain bogus NS records when using forwarders. A
remote attacker could possibly use this issue to manipulate cache results.
(CVE-2021-25220)

Update instructions

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

Ubuntu 16.04

• bind9 - 1:9.10.3.dfsg.P4-8ubuntu1.19+esm2
  Available with Ubuntu Pro

Ubuntu 14.04

• bind9 - 1:9.9.5.dfsg-3ubuntu0.19+esm6
  Available with Ubuntu Pro

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

References

• CVE-2021-25220

Related notices

• USN-5332-1: dnsutils, libbind-export-dev, bind9-dev, libisccc160, bind9, libbind9-160, libisccc-export160, liblwres160, libirs-export160, bind9-doc, bind9-utils, libbind-dev, libdns-export1100, bind9-libs, bind9-host, libisc-export169, libisc169, libisccfg-export160, bind9-dnsutils, libdns1100, bind9utils, libirs160, libisccfg160