strongswan: Denial of Service - Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2094
                         strongSwan vulnerability
                              22 August 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           strongswan
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-11185  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3397-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running strongswan check for an updated version of the software for
         their operating system.

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USN-3397-1: strongSwan vulnerability
Ubuntu Security Notice USN-3397-1
21st August, 2017

strongswan vulnerability

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

Ubuntu 17.04
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS
Summary

strongSwan could be made to crash or hang if it received specially crafted network traffic.

Software description

strongswan - IPsec VPN solution
Details

It was discovered that strongSwan incorrectly handled verifying
specific RSA signatures. A remote attacker could use this issue
to cause strongSwan to crash, resulting in a denial of service.

Update instructions

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

Ubuntu 17.04:
libstrongswan 5.5.1-1ubuntu3.2
strongswan 5.5.1-1ubuntu3.2
Ubuntu 16.04 LTS:
libstrongswan 5.3.5-1ubuntu3.4
strongswan 5.3.5-1ubuntu3.4
Ubuntu 14.04 LTS:
libstrongswan 5.1.2-0ubuntu2.7
strongswan 5.1.2-0ubuntu2.7
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2017-11185

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