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Ubuntu 20.04 USN-6435-2 Moderate OpenSSL Resource Denial of Service

ubuntu
Calendar Grey October 25, 2023
Dist Ubuntu Esm H88
Security flaws in OpenSSL for Ubuntu 20.04 LTS may result in excessive resource utilization, potentially causing service disruptions. Take action to update now!
OpenSSL could be made to consume resources and cause long delays if it processed certain input.

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)

Topics%20covered

Topics Covered

security advisory denial of service ubuntu openssl resource consumption resource issue

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

Ubuntu Security Notice USN-6435-2

Topics%20covered

Topics Covered

security advisory denial of service ubuntu openssl resource consumption resource issue

Package Information

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

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