=========================================================================Ubuntu Security Notice USN-6183-2
July 18, 2023
bind9 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)
Summary:
Bind could be made to crash if it received specially crafted network traffic.
Software Description:
- bind9: Internet Domain Name Server
Details:
USN-6183-1 fixed vulnerabilities in Bind. This update provides the
corresponding updates for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04
LTS.
Original advisory details:
Shoham Danino, Anat Bremler-Barr, Yehuda Afek, and Yuval Shavitt discovered
that Bind incorrectly handled the cache size limit. A remote attacker could
possibly use this issue to consume memory, leading to a denial of service.
(CVE-2023-2828)
It was discovered that Bind incorrectly handled the recursive-clients
quota. A remote attacker could possibly use this issue to cause Bind to
crash, resulting in a denial of service. This issue only affected Ubuntu
22.04 LTS, Ubuntu 22.10, and Ubuntu 23.04. (CVE-2023-2911)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS (Available with Ubuntu Pro):
bind9 1:9.11.3+dfsg-1ubuntu1.19+esm1
Ubuntu 16.04 LTS (Available with Ubuntu Pro):
bind9 1:9.10.3.dfsg.P4-8ubuntu1.19+esm6
Ubuntu 14.04 LTS (Available with Ubuntu Pro):
bind9 1:9.9.5.dfsg-3ubuntu0.19+esm10
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6183-2
https://ubuntu.com/security/notices/USN-6183-1
CVE-2023-2828
