An OpenSSL security update has been released for Ubuntu Linux 18.04 LTS.

USN-5845-1: OpenSSL vulnerabilities

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Ubuntu Security Notice USN-5845-1
February 07, 2023

openssl1.0 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

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

Details:

David Benjamin discovered that OpenSSL incorrectly handled X.400 address
processing. A remote attacker could possibly use this issue to read
arbitrary memory contents or cause OpenSSL to crash, resulting in a denial
of service. (CVE-2023-0286)

Octavio Galland and Marcel Böhme discovered that OpenSSL incorrectly
handled streaming ASN.1 data. A remote attacker could use this issue to
cause OpenSSL to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2023-0215)

Update instructions:

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

Ubuntu 18.04 LTS:
libssl1.0.0 1.0.2n-1ubuntu5.11

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

References:
https://ubuntu.com/security/notices/USN-5845-1
CVE-2023-0215, CVE-2023-0286

Package Information:
https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.11