1. Ubuntu Security Notices
  2. USN-4891-1

USN-4891-1: OpenSSL vulnerability

Publication date

25 March 2021

Overview

OpenSSL could be made to crash if it received specially crafted network traffic.

Releases

Packages

  • openssl - Secure Socket Layer (SSL) cryptographic library and tools

Details

It was discovered that OpenSSL incorrectly handled certain renegotiation
ClientHello messages. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service.

It was discovered that OpenSSL incorrectly handled certain renegotiation
ClientHello messages. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
20.10 groovy libssl1.1 –  1.1.1f-1ubuntu4.3
20.04 focal libssl1.1 –  1.1.1f-1ubuntu2.3
18.04 bionic libssl1.1 –  1.1.1-1ubuntu2.1~18.04.9

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References

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