An OpenSSL security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.

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Ubuntu Security Notice USN-4662-1
December 08, 2020

openssl, openssl1.0 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

OpenSSL could be made to crash if it processed specially crafted input.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools
- openssl1.0: Secure Socket Layer (SSL) cryptographic library and tools

Details:

David Benjamin discovered that OpenSSL incorrectly handled comparing
certificates containing a EDIPartyName name type. A remote attacker could
possibly use this issue to cause OpenSSL to crash, resulting in a denial of
service.

Update instructions:

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

Ubuntu 20.10:
libssl1.1 1.1.1f-1ubuntu4.1

Ubuntu 20.04 LTS:
libssl1.1 1.1.1f-1ubuntu2.1

Ubuntu 18.04 LTS:
libssl1.0.0 1.0.2n-1ubuntu5.5
libssl1.1 1.1.1-1ubuntu2.1~18.04.7

Ubuntu 16.04 LTS:
libssl1.0.0 1.0.2g-1ubuntu4.18

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
  https://usn.ubuntu.com/4662-1
CVE-2020-1971

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu4.1
  https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1~18.04.7
  https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.5
  https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.18