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Puppet Remote Code Execution

Puppet Remote Code Execution
Posted Jun 19, 2013
Authored by Ben Murphy

When making REST api calls, the puppet master takes YAML from an untrusted client, deserializes it, and then calls methods on the resulting object. A YAML payload can be crafted to cause the deserialization to construct an instance of any class available in the ruby process, which allows an attacker to execute code contained in the payload.

tags | advisory, ruby
advisories | CVE-2013-3567
MD5 | 2cb2c677113cd3811e4bad569b79bce9

Puppet Remote Code Execution

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Overview
CVE-2013-3567 (Unauthenticated Remote Code Execution Vulnerability)
Posted June 18, 2013

When making REST api calls, the puppet master takes YAML from an untrusted
client, deserializes it, and then calls methods on the resulting object. A YAML
payload can be crafted to cause the deserialization to construct an instance of
any class available in the ruby process, which allows an attacker to execute
code contained in the payload.
Status

Resolved in Puppet 2.7.22, 3.2.2
Resolved in Puppet Enterprise 2.8.2

Credits

Credit to Ben Murphy for the responsible disclosure of this vulnerability.


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