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Ubuntu 22.04 LTS USN-5569-1 Moderate: Unbound Domain Caching Issue

ubuntu
Calendar Grey August 16, 2022
Dist Ubuntu Esm H88
The notice details vulnerabilities linked to Unbound's caching mechanisms. Apply security updates to the impacted Ubuntu releases urgently.
Unbound could be made to cache rogue domain names.

Summary

Unbound could be made to cache rogue domain names.

Software Description:

- unbound: validating, recursive, caching DNS resolver

Details:

Xiang Li discovered that Unbound incorrectly handled delegation caching.

A remote attacker could use this issue to keep rogue domain names

resolvable long after they have been revoked.

Topics%20covered

Topics Covered

security advisory update moderate threat ubuntu unbound caching issue domain issue

Update Instructions

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

Ubuntu 22.04 LTS:
  libunbound8                     1.13.1-1ubuntu5.1
  unbound                         1.13.1-1ubuntu5.1

Ubuntu 20.04 LTS:
  libunbound8                     1.9.4-2ubuntu1.3
  unbound                         1.9.4-2ubuntu1.3

Ubuntu 18.04 LTS:
  libunbound2                     1.6.7-1ubuntu2.5
  unbound                         1.6.7-1ubuntu2.5

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

References

CVE-2022-30698, CVE-2022-30699

Severity
important
Lowest
Low
Medium
High
Critical

August 16, 2022

Topics%20covered

Topics Covered

security advisory update moderate threat ubuntu unbound caching issue domain issue

Package Information

https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.1
https://launchpad.net/ubuntu/+source/unbound/1.9.4-2ubuntu1.3
https://launchpad.net/ubuntu/+source/unbound/1.6.7-1ubuntu2.5

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