USN-5051-2: OpenSSL vulnerability

Publication date

26 August 2021

Overview

OpenSSL could be made to crash or expose sensitive information if it received a specially crafted ASN.1 string.


Packages

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

Details

USN-5051-1 fixed a vulnerability in OpenSSL. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Ingo Schwarze discovered that OpenSSL incorrectly handled certain ASN.1
strings. A remote attacker could use this issue to cause OpenSSL to crash,
resulting in a denial of service, or possibly obtain sensitive information.
(CVE-2021-3712)

USN-5051-1 fixed a vulnerability in OpenSSL. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Ingo Schwarze discovered that OpenSSL incorrectly handled certain ASN.1
strings. A remote attacker could use this issue to cause OpenSSL to crash,
resulting in a denial of service, or possibly obtain sensitive information.
(CVE-2021-3712)

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
16.04 xenial libssl1.0.0 –  1.0.2g-1ubuntu4.20+esm1  
14.04 trusty libssl1.0.0 –  1.0.1f-1ubuntu2.27+esm3  

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