Plone 4.1.3 and earlier computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-4462
• https://exchange.xforce.ibmcloud.com/vulnerabilities/72018
• GHSA-pcwm-8jc3-qxvj
• http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
• http://secunia.com/advisories/47406
• http://www.kb.cert.org/vuls/id/903934
• http://www.nruns.com/_downloads/advisory28122011.pdf
• http://www.ocert.org/advisories/ocert-2011-003.html