Ubuntu 21.04 USN-4990-1 Moderate: Nettle Denial Of Service

ubuntu

June 17, 2021

Several security issues were fixed in Nettle.

Summary

Several security issues were fixed in Nettle.

Software Description:

- nettle: low level cryptographic library

Details:

It was discovered that Nettle incorrectly handled RSA decryption. A remote

attacker could possibly use this issue to cause Nettle to crash, resulting

in a denial of service. (CVE-2021-3580)

It was discovered that Nettle incorrectly handled certain padding oracles.

A remote attacker could possibly use this issue to perform a variant of the

Bleichenbacher attack. This issue only affected Ubuntu 18.04 LTS.

(CVE-2018-16869)

Topics Covered

security advisory denial of service software update ubuntu cryptographic nettle

Update Instructions

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

Ubuntu 21.04:
  libnettle8                      3.7-2.1ubuntu1.1

Ubuntu 20.10:
  libnettle8                      3.6-2ubuntu0.2

Ubuntu 20.04 LTS:
  libnettle7                      3.5.1+really3.5.1-2ubuntu0.2

Ubuntu 18.04 LTS:
  libnettle6                      3.4.1-0ubuntu0.18.04.1

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