USN-6998-1: Unbound vulnerabilities

Releases

• Ubuntu 24.04 LTS
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• unbound - validating, recursive, caching DNS resolver

Details

It was discovered that Unbound incorrectly handled string comparisons,
which could lead to a NULL pointer dereference. An attacker could
potentially use this issue to cause a denial of service. (CVE-2024-43167)

It was discovered that Unbound incorrectly handled memory in
cfg_mark_ports, which could lead to a heap buffer overflow. A local
attacker could potentially use this issue to cause a denial of service
or execute arbitrary code. (CVE-2024-43168)

Update instructions

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

Ubuntu 24.04

• libunbound8 - 1.19.2-1ubuntu3.2
• unbound - 1.19.2-1ubuntu3.2
• unbound-host - 1.19.2-1ubuntu3.2

Ubuntu 22.04

• libunbound8 - 1.13.1-1ubuntu5.7
• unbound - 1.13.1-1ubuntu5.7
• unbound-host - 1.13.1-1ubuntu5.7

Ubuntu 20.04

• libunbound8 - 1.9.4-2ubuntu1.8
• unbound - 1.9.4-2ubuntu1.8
• unbound-host - 1.9.4-2ubuntu1.8

Ubuntu 18.04

• libunbound2 - 1.6.7-1ubuntu2.6+esm2
  Available with Ubuntu Pro
• unbound - 1.6.7-1ubuntu2.6+esm2
  Available with Ubuntu Pro
• unbound-host - 1.6.7-1ubuntu2.6+esm2
  Available with Ubuntu Pro

Ubuntu 16.04

• libunbound2 - 1.5.8-1ubuntu1.1+esm1
  Available with Ubuntu Pro
• unbound - 1.5.8-1ubuntu1.1+esm1
  Available with Ubuntu Pro
• unbound-host - 1.5.8-1ubuntu1.1+esm1
  Available with Ubuntu Pro

Ubuntu 14.04

• libunbound2 - 1.4.22-1ubuntu4.14.04.3+esm1
  Available with Ubuntu Pro
• unbound - 1.4.22-1ubuntu4.14.04.3+esm1
  Available with Ubuntu Pro
• unbound-host - 1.4.22-1ubuntu4.14.04.3+esm1
  Available with Ubuntu Pro

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

References

• CVE-2024-43167
• CVE-2024-43168