USN-4990-1: Nettle vulnerabilities

Releases

• Ubuntu 21.04
• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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)

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

• libnettle7 - 3.5.1+really3.5.1-2ubuntu0.2

Ubuntu 18.04

• libnettle6 - 3.4.1-0ubuntu0.18.04.1

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

References

• CVE-2018-16869
• CVE-2021-3580