USN-5332-1: Bind vulnerabilities

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)

It was discovered that Bind incorrectly handled certain crafted TCP
streams. A remote attacker could possibly use this issue to cause Bind to
consume resources, leading to a denial of service. This issue only affected
Ubuntu 21.10. (CVE-2022-0396)

Update instructions

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

Ubuntu 21.10

• bind9 - 1:9.16.15-1ubuntu1.2

Ubuntu 20.04

• bind9 - 1:9.16.1-0ubuntu2.10

Ubuntu 18.04

• bind9 - 1:9.11.3+dfsg-1ubuntu1.17

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

References

• CVE-2021-25220
• CVE-2022-0396

Related notices

• USN-5332-2: bind9utils, libdns-export162, libbind9-140, libisc-export160, libbind-dev, bind9-host, libisccc140, libisccc-export140-udeb, dnsutils, libisccfg-export140, libirs141, libisccfg140, libdns100, bind9-doc, libbind-export-dev, libisc160, libirs-export141, lwresd, liblwres90, libbind9-90, host, liblwres141, libisccc90, libdns162, libisccc-export140, libisccfg90, bind9, libisc95