CVE-2017-2295 Amazon Linux Security Advisory for puppet3: ALAS-2017-849

Unsafe YAML deserialization:
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. This change constrains the format of data on the wire to PSON or safely decoded YAML. (CVE-2017-2295 )

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

Please refer to Amazon advisory ALAS-2017-849 for affected packages and patching details, or update with your package manager.

Patch:
Following are links for downloading patches to fix the vulnerabilities:

ALAS-2017-849: Amazon Linux (puppet3 (3.7.4-1.13.amzn1) on src)

ALAS-2017-849: Amazon Linux (puppet3 (3.7.4-1.13.amzn1) on noarch)