Puppet 2.7.x before 2.7.5, 2.6.x before 2.6.11, and 0.25.x allows local users to modify the permissions of arbitrary files via a symlink attack on the SSH authorized_keys file.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-3870
• https://puppet.com/security/cve/cve-2011-3870
• http://groups.google.com/group/puppet-announce/browse_thread/thread/91e3b46d2328a1cb
• http://lists.fedoraproject.org/pipermail/package-announce/2011-October/068053.html
• http://lists.fedoraproject.org/pipermail/package-announce/2011-October/068061.html
• http://lists.fedoraproject.org/pipermail/package-announce/2011-October/068093.html
• http://www.debian.org/security/2011/dsa-2314
• http://www.ubuntu.com/usn/USN-1223-1
• http://www.ubuntu.com/usn/USN-1223-2
• puppetlabs/puppet@88512e8
• puppetlabs/puppet@b29b178
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puppet/CVE-2011-3870.yml