Ubuntu alert USN-5111-2 (strongswan)

From:
             
 
"Leonidas S. Barbosa" <leo.barbosa@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-5111-2] strongSwan vulnerability
Date:
             
 
Tue, 19 Oct 2021 12:13:14 -0300
Message-ID:
             
 
<20211019151314.GA2593875@d4rkl41n>
==========================================================================
Ubuntu Security Notice USN-5111-2
October 19, 2021

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

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

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)

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
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