Ubuntu alert USN-5651-2 (strongswan)

From:
             
 
"Leonidas S. Barbosa" <leo.barbosa@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-5651-2] strongSwan vulnerability
Date:
             
 
Mon, 03 Oct 2022 16:58:14 -0300
Message-ID:
             
 
<20221003195814.GA3447450@d4rkl41n>
==========================================================================
Ubuntu Security Notice USN-5651-2
October 03, 2022

strongswan vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

strongSwan could be made do denial of service if it received
a specially crafted certificate.

Software Description:
- strongswan: IPsec VPN solution

Details:

USN-5651-1 fixed a vulnerability in strongSwan. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

 Lahav Schlesinger discovered that strongSwan incorrectly handled certain OCSP URIs and
 and CRL distribution points (CDP) in certificates. A remote attacker could
 possibly use this issue to initiate IKE_SAs and send crafted certificates
 that contain URIs pointing to servers under their control, which can lead
 to a denial-of-service attack.

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+esm3
  strongswan                      5.3.5-1ubuntu3.8+esm3

Ubuntu 14.04 ESM:
  libstrongswan                   5.1.2-0ubuntu2.11+esm3
  strongswan                      5.1.2-0ubuntu2.11+esm3

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

References:
  https://ubuntu.com/security/notices/USN-5651-2
  https://ubuntu.com/security/notices/USN-5651-1
  CVE-2022-40617