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Ubuntu 20.04 LTS: USN-4468-1 Critical: Bind Denial Of Service Risks

ubuntu
Calendar Grey August 21, 2020
Dist Ubuntu Esm H88
A new security advisory for Ubuntu highlights vulnerabilities in bind9 affecting multiple LTS releases and provides effective measures for remediation
Several security issues were fixed in Bind.

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 rem...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu update instructions bind9 TCP payloads update severity

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://ubuntu.com/security/notices/USN-4468-1

CVE-2020-8620, CVE-2020-8621, CVE-2020-8622, CVE-2020-8623,

CVE-2020-8624

Severity
critical
Lowest
Low
Medium
High
Critical

August 21, 2020

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu update instructions bind9 TCP payloads update severity

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

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