USN-4906-1: Nettle vulnerability

Publication date

13 April 2021

Overview

Nettle could be made to crash or bypass signature verification if it opened a specially crafted certificate.


Packages

  • nettle - low level cryptographic library

Details

It was discovered that Nettle incorrectly handled signature verification.
A remote attacker could use this issue to cause Nettle to crash, resulting
in a denial of service, or possibly force invalid signatures.

It was discovered that Nettle incorrectly handled signature verification.
A remote attacker could use this issue to cause Nettle to crash, resulting
in a denial of service, or possibly force invalid signatures.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
20.10 groovy libnettle8 –  3.6-2ubuntu0.1
20.04 focal libnettle7 –  3.5.1+really3.5.1-2ubuntu0.1
18.04 bionic libnettle6 –  3.4-1ubuntu0.1
16.04 xenial libnettle6 –  3.2-1ubuntu0.16.04.2

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