Technical Description

A vulnerability has been identified in Ruby on Rails, which could be exploited by attackers to bypass security restrictions. This issue is caused by an error when handling the block passed to "authenticate_or_request_with_http_digest()", which could allow attackers to bypass authentication by providing an invalid username with an empty password.

Affected Products

Ruby on Rails version 2.3.2 and prior

Solution

Apply patches :
http://github.com/rails/rails/commit/056ddbdcfb07f0b5c7e6ed8a35f6c3b55b4ab489

References

http://www.vupen.com/english/advisories/2009/1802
http://weblog.rubyonrails.org/2009/6/3/security-problem-with-authenticate_with_http_digest
http://n8.tumblr.com/post/117477059/security-hole-found-in-rails-2-3s

Credits

Vulnerability reported by Nate.

ChangeLog

2009-07-07 : Initial release

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