Updated Strongswan packages has been released for Ubuntu Linux 18.04 LTS, 16.04 LTS, and 14.04 LTS. This update addresses several security issues.

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Ubuntu Security Notice USN-3771-1
September 25, 2018

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in strongSwan.

Software Description:
- strongswan: IPsec VPN solution

Details:

It was discovered that strongSwan incorrectly handled IKEv2 key derivation.
A remote attacker could possibly use this issue to cause strongSwan to
crash, resulting in a denial of service. (CVE-2018-10811)

Sze Yiu Chau discovered that strongSwan incorrectly handled parsing OIDs in
the gmp plugin. A remote attacker could possibly use this issue to bypass
authorization. (CVE-2018-16151)

Sze Yiu Chau discovered that strongSwan incorrectly handled certain
parameters fields in the gmp plugin. A remote attacker could possibly use
this issue to bypass authorization. (CVE-2018-16152)

It was discovered that strongSwan incorrectly handled the stroke plugin. A
local administrator could use this issue to cause a denial of service, or
possibly execute arbitrary code. (CVE-2018-5388)

Update instructions:

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

Ubuntu 18.04 LTS:
libstrongswan 5.6.2-1ubuntu2.2
strongswan 5.6.2-1ubuntu2.2

Ubuntu 16.04 LTS:
libstrongswan 5.3.5-1ubuntu3.7
strongswan 5.3.5-1ubuntu3.7

Ubuntu 14.04 LTS:
libstrongswan 5.1.2-0ubuntu2.10
strongswan 5.1.2-0ubuntu2.10

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

References:
https://usn.ubuntu.com/usn/usn-3771-1
CVE-2018-10811, CVE-2018-16151, CVE-2018-16152, CVE-2018-5388

Package Information:
https://launchpad.net/ubuntu/+source/strongswan/5.6.2-1ubuntu2.2
https://launchpad.net/ubuntu/+source/strongswan/5.3.5-1ubuntu3.7
https://launchpad.net/ubuntu/+source/strongswan/5.1.2-0ubuntu2.10

  Strongswan Security Update for Ubuntu