Ubuntu Security Notice USN-5111-2
October 19, 2021
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 ESM
– Ubuntu 14.04 ESM
Several security issues were fixed in strongSwan.
– strongswan: IPsec VPN solution
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)
The problem can be corrected by updating your system to the following
Ubuntu 16.04 ESM:
Ubuntu 14.04 ESM:
In general, a standard system update will make all the necessary changes.