Vulnerability CVE-2009-2422
Published: 2009-07-10   Modified: 2012-02-13

Description:
The example code for the digest authentication functionality (http_authentication.rb) in Ruby on Rails before 2.3.3 defines an authenticate_or_request_with_http_digest block that returns nil instead of false when the user does not exist, which allows context-dependent attackers to bypass authentication for applications that are derived from this example by sending an invalid username without a password.

Type:

CWE-287

 (Improper Authentication)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
David hansson -> Ruby on rails 

 References:
http://xforce.iss.net/xforce/xfdb/51528
http://www.vupen.com/english/advisories/2009/1802
http://www.securityfocus.com/bid/35579
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
http://support.apple.com/kb/HT4077
http://secunia.com/advisories/35702
http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html
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