[USN-4990-1] Nettle vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Thu Jun 17 11:35:48 UTC 2021

Ubuntu Security Notice USN-4990-1
June 17, 2021

nettle vulnerabilities

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

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


Several security issues were fixed in Nettle.

Software Description:
- nettle: low level cryptographic library


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.

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.

  CVE-2018-16869, CVE-2021-3580

Package Information:

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