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Ubuntu Security Notice USN-6435-2
October 25, 2023

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

- Ubuntu 20.04 LTS

Summary:

OpenSSL could be made to consume resources and cause long delays
if it processed certain input.

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

Details:

USN-6435-1 fixed vulnerabilities in OpenSSL. This update
provides the corresponding updates for Ubuntu 20.04 LTS.

Original advisory details:

  It was discovered that OpenSSL incorrectly handled excessively large
  Diffie-Hellman parameters. An attacker could possibly use this issue
  to cause a denial of service. (CVE-2023-3446)

  Bernd Edlinger discovered that OpenSSL incorrectly handled excessively
  large Diffie-Hellman parameters. An attacker could possibly use this
  issue to cause a denial of service. (CVE-2023-3817)

Update instructions:

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

Ubuntu 20.04 LTS:
   libssl1.1                        1.1.1f-1ubuntu2.20
   openssl                         1.1.1f-1ubuntu2.20

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

References:
   https://ubuntu.com/security/notices/USN-6435-2
   https://ubuntu.com/security/notices/USN-6435-1
   CVE-2023-3446, CVE-2023-3817

Package Information:
   https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.20