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Debian LTS Advisory ([SECURITY] [DLA 1012-1] puppet security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
Versions of Puppet prior to 4.10.1 will deserialize data off the wire (from the agent to the server, in this case) with a attacker-specified format. This could be used to force YAML deserialization in an unsafe manner, which would lead to remote code execution.
Affected Software
Affected Software
puppet on Debian Linux
Detection Method
Detection Method
This check tests the installed software version using the apt package manager.
Solution
Solution
For Debian 7 'Wheezy', these problems have been fixed in version 2.7.23-1~deb7u4, by enabling PSON serialization on clients and refusing non-PSON formats on the server. We recommend that you upgrade your puppet packages. Make sure you update all your clients before you update the server otherwise older clients won't be able to connect to the server.