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Ubuntu Security Notice USN-6435-1

Ubuntu Security Notice 6435-1 - 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. 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.

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Ubuntu Security Notice USN-6435-1
October 18, 2023

openssl vulnerabilities

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:

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:

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 18.04 LTS (Available with Ubuntu Pro):
libssl1.1 1.1.1-1ubuntu2.1~18.04.23+esm1
openssl 1.1.1-1ubuntu2.1~18.04.23+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
libssl1.0.0 1.0.2g-1ubuntu4.20+esm10
openssl 1.0.2g-1ubuntu4.20+esm10

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

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

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