1. Ubuntu Security Notices
  2. USN-5787-2

USN-5787-2: Libksba vulnerability

Publication date

9 January 2023

Overview

Libksba could be made to crash or run programs if it processed specially crafted data.

Releases

Packages

  • libksba - X.509 and CMS support library

Details

USN-5787-1 fixed vulnerabilities in Libksba. This update provides the
corresponding updates for Ubuntu 16.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that Libksba incorrectly handled parsing CRL signatures.
A remote attacker could use this issue to cause Libksba to crash, resulting
in a denial of service, or possibly execute arbitrary code.

USN-5787-1 fixed vulnerabilities in Libksba. This update provides the
corresponding updates for Ubuntu 16.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that Libksba incorrectly handled parsing CRL signatures.
A remote attacker could use this issue to cause Libksba to crash, resulting
in a denial of service, or possibly execute arbitrary code.

Update instructions

In general, a standard system update will 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 libksba8 –  1.3.3-1ubuntu0.16.04.1+esm2  
14.04 trusty libksba8 –  1.3.0-3ubuntu0.14.04.2+esm2  

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References

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