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Ubuntu 16.04 and 14.04: USN-5111-2 StrongSwan Denial of Service

ubuntu
Calendar Grey October 19, 2021
Dist Ubuntu Esm H88
Ensure your Ubuntu 14.04 and 16.04 installations are upgraded to patch strongSwan flaws, thereby fortifying overall system security.
Several security issues were fixed in strongSwan.

Summary

Several security issues were fixed in strongSwan.

Software Description:

- strongswan: IPsec VPN solution

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)

Topics%20covered

Topics Covered

security advisory denial of service remote attack Ubuntu strongSwan

Update Instructions

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

Ubuntu 16.04 ESM:
  libstrongswan                   5.3.5-1ubuntu3.8+esm1
  strongswan                      5.3.5-1ubuntu3.8+esm1

Ubuntu 14.04 ESM:
  libstrongswan                   5.1.2-0ubuntu2.11+esm1
  strongswan                      5.1.2-0ubuntu2.11+esm1

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-5111-2

https://ubuntu.com/security/notices/USN-5111-1

CVE-2021-41991

Severity
important
Lowest
Low
Medium
High
Critical

October 19, 2021

Topics%20covered

Topics Covered

security advisory denial of service remote attack Ubuntu strongSwan

Package Information

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