USN-4374-1: Unbound vulnerabilities

unbound vulnerabilities

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

Ubuntu 20.04 LTS
Ubuntu 19.10
Ubuntu 18.04 LTS

Summary

Several security issues were fixed in Unbound.

Software Description

unbound – validating, recursive, caching DNS resolver

Details

Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Unbound
incorrectly handled certain queries. A remote attacker could use this issue
to perform an amplification attack directed at a target. (CVE-2020-12662)

It was discovered that Unbound incorrectly handled certain malformed
answers. A remote attacker could possibly use this issue to cause Unbound
to crash, resulting in a denial of service. (CVE-2020-12663)

Update instructions

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

Ubuntu 20.04 LTS: libunbound8 – 1.9.4-2ubuntu1.1; unbound – 1.9.4-2ubuntu1.1
Ubuntu 19.10: libunbound8 – 1.9.0-2ubuntu1.1; unbound – 1.9.0-2ubuntu1.1
Ubuntu 18.04 LTS: libunbound2 – 1.6.7-1ubuntu2.3; unbound – 1.6.7-1ubuntu2.3

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

Source: USN-4374-1: Unbound vulnerabilities

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