1. Ubuntu Security Notices
  2. USN-5111-2

USN-5111-2: strongSwan vulnerability

Publication date

19 October 2021

Overview

Several security issues were fixed in strongSwan.

Releases

Packages

Details

USN-5111-1 fixed a vulnerability in strongSwan. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that strongSwan incorrectly handled replacing
certificates in the cache. A remote attacker could use this issue to cause
strongSwan to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-41991)

USN-5111-1 fixed a vulnerability in strongSwan. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that strongSwan incorrectly handled replacing
certificates in the cache. A remote attacker could use this issue to cause
strongSwan to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-41991)

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 libstrongswan –  5.3.5-1ubuntu3.8+esm1  
strongswan –  5.3.5-1ubuntu3.8+esm1  
14.04 trusty libstrongswan –  5.1.2-0ubuntu2.11+esm1  
strongswan –  5.1.2-0ubuntu2.11+esm1  

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References

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