Ubuntu 21.10 USN-5111-1 Critical: StrongSwan Denial of Service

ubuntu

October 19, 2021

Several security issues were fixed in strongSwan.

Summary

Several security issues were fixed in strongSwan.

Software Description:

- strongswan: IPsec VPN solution

Details:

It was discovered that strongSwan incorrectly handled certain RSASSA-PSS

signatures. A remote attacker could use this issue to cause strongSwan to

crash, resulting in a denial of service. (CVE-2021-41990)

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 Covered

security advisory denial of service critical issue Ubuntu strongSwan

Update Instructions

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

Ubuntu 21.10:
  libstrongswan                   5.9.1-1ubuntu3.1
  strongswan                      5.9.1-1ubuntu3.1

Ubuntu 21.04:
  libstrongswan                   5.9.1-1ubuntu1.2
  strongswan                      5.9.1-1ubuntu1.2

Ubuntu 20.04 LTS:
  libstrongswan                   5.8.2-1ubuntu3.3
  strongswan                      5.8.2-1ubuntu3.3

Ubuntu 18.04 LTS:
  libstrongswan                   5.6.2-1ubuntu2.7
  strongswan                      5.6.2-1ubuntu2.7

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