Exploit/Advisories

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Ubuntu Security Notice USN-5626-2
September 21, 2022

bind9 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

USN-5626-1 fixed several vulnerabilities in Bind. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Yehuda Afek, Anat Bremler-Barr, and Shani Stajnrod discovered that Bind
incorrectly handled large delegations. A remote attacker could possibly use
this issue to reduce performance, leading to a denial of service.
(CVE-2022-2795)

It was discovered that Bind incorrectly handled memory when processing
ECDSA DNSSEC verification. A remote attacker could use this issue to
consume resources, leading to a denial of service. (CVE-2022-38177)

Update instructions:

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

Ubuntu 16.04 ESM:
bind9 1:9.10.3.dfsg.P4-8ubuntu1.19+esm3

Ubuntu 14.04 ESM:
bind9 1:9.9.5.dfsg-3ubuntu0.19+esm7

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

References:
https://ubuntu.com/security/notices/USN-5626-2
https://ubuntu.com/security/notices/USN-5626-1
CVE-2022-2795, CVE-2022-38177

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