lib/puppet/ssl/certificate_authority.rb in Puppet before 2.6.17 and 2.7.x before 2.7.18, and Puppet Enterprise before 2.5.2, does not properly restrict the characters in the Common Name field of a Certificate Signing Request (CSR), which makes it easier for user-assisted remote attackers to trick administrators into signing a crafted agent certificate via ANSI control sequences.

References

• https://nvd.nist.gov/vuln/detail/CVE-2012-3867
• puppetlabs/puppet@dfedaa5
• puppetlabs/puppet@f341962
• https://bugzilla.redhat.com/show_bug.cgi?id=839158
• http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00006.html
• http://lists.opensuse.org/opensuse-updates/2012-07/msg00036.html
• http://puppetlabs.com/security/cve/cve-2012-3867/
• http://www.debian.org/security/2012/dsa-2511
• http://www.ubuntu.com/usn/USN-1506-1
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puppet/CVE-2012-3867.yml
• https://www.puppet.com/security/cve/cve-2012-3867-insufficient-input-validation