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Ubuntu Security Notice USN-6909-2
August 01, 2024

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

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

USN-6909-1 fixed several vulnerabilities in Bind. This update provides
the corresponding update for Ubuntu 18.04 LTS.

Original advisory details:

 Toshifumi Sakaguchi discovered that Bind incorrectly handled having a very
 large number of RRs existing at the same time. A remote attacker could
 possibly use this issue to cause Bind to consume resources, leading to a
 denial of service. (CVE-2024-1737)

 It was discovered that Bind incorrectly handled a large number of SIG(0)
 signed requests. A remote attacker could possibly use this issue to cause
 Bind to consume resources, leading to a denial of service. (CVE-2024-1975)

Update instructions:

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

Ubuntu 18.04 LTS
  bind9                           1:9.11.3+dfsg-1ubuntu1.19+esm4
                                  Available with Ubuntu Pro

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References:
  https://ubuntu.com/security/notices/USN-6909-2
  https://ubuntu.com/security/notices/USN-6909-1
  CVE-2024-1737, CVE-2024-1975