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Ubuntu Security Notice USN-6632-1
February 13, 2024

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

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in OpenSSL.

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

Details:

David Benjamin discovered that OpenSSL incorrectly handled excessively long
X9.42 DH keys. A remote attacker could possibly use this issue to cause
OpenSSL to consume resources, leading to a denial of service.
(CVE-2023-5678)

Bahaa Naamneh discovered that OpenSSL incorrectly handled certain malformed
PKCS12 files. A remote attacker could possibly use this issue to cause
OpenSSL to crash, resulting in a denial of service. (CVE-2024-0727)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   libssl1.1                       1.1.1-1ubuntu2.1~18.04.23+esm4

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   libssl1.0.0                     1.0.2g-1ubuntu4.20+esm11

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

References:
   https://ubuntu.com/security/notices/USN-6632-1
   CVE-2023-5678, CVE-2024-0727