What’s Vulnerable › Vulnerabilities

CVE-2011-3872

• Severity: low (CVSS 2.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-10-27 · updated 2026-06-16
• Weakness: CWE-20

Description

Puppet 2.6.x before 2.6.12 and 2.7.x before 2.7.6, and Puppet Enterprise (PE) Users 1.0, 1.1, and 1.2 before 1.2.4, when signing an agent certificate, adds the Puppet master's certdnsnames values to the X.509 Subject Alternative Name field of the certificate, which allows remote attackers to spoof a Puppet master via a man-in-the-middle (MITM) attack against an agent that uses an alternate DNS name for the master, aka "AltNames Vulnerability."

Affected products

• Puppet Agent: 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5 (+10)
• Puppet Enterprise: 1.2.0, 1.2.1, 1.2.2, 1.2.3
• Puppetlabs Puppet: 2.7.0, 2.7.1
• Puppetlabs Puppet Enterprise Users: 1.0, 1.1

References

• http://groups.google.com/group/puppet-announce/browse_thread/thread/e7edc3a71348f3e1
• http://puppetlabs.com/blog/important-security-announcement-altnames-vulnerability/
• http://secunia.com/advisories/46550
• http://secunia.com/advisories/46578
• http://secunia.com/advisories/46934
• http://secunia.com/advisories/46964
• http://www.securityfocus.com/bid/50356
• http://www.ubuntu.com/usn/USN-1238-1
• http://www.ubuntu.com/usn/USN-1238-2
• https://exchange.xforce.ibmcloud.com/vulnerabilities/70970
• https://puppet.com/security/cve/cve-2011-3872
• http://groups.google.com/group/puppet-announce/browse_thread/thread/e7edc3a71348f3e1

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