==========================================================================
Ubuntu Security Notice USN-4468-2
August 24, 2020
bind9 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 14.04 ESM
– Ubuntu 12.04 ESM
Summary:
Bind could be made to crash if it received a specially crafted
request.
Software Description:
– bind9: Internet Domain Name Server
Details:
USN-4468-1 fixed a vulnerability in Bind. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
Original advisory details:
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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 ESM:
bind9 1:9.9.5.dfsg-3ubuntu0.19+esm3
Ubuntu 12.04 ESM:
bind9 1:9.8.1.dfsg.P1-4ubuntu0.31
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4468-2
https://usn.ubuntu.com/4468-1
CVE-2020-8622
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