GitHub Enterprise before 20120304 does not properly restrict the use of a hash to provide values for a model's attributes, which allows remote attackers to set the public_key[user_id] value via a modified URL for the public-key update form, related to a "mass assignment" vulnerability.

References

• https://nvd.nist.gov/vuln/detail/CVE-2012-2055
• https://exchange.xforce.ibmcloud.com/vulnerabilities/74812
• https://github.com/blog/1068-public-key-security-vulnerability-and-mitigation
• http://homakov.blogspot.com/2012/03/how-to.html
• http://lwn.net/Articles/488702/