National Cyber-Alert System
Vulnerability Summary for CVE-2009-2422
Original release date:07/10/2009
Last revised:07/13/2009
Source:
US-CERT/NIST
Overview
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.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
6.4
Exploitability Subscore:
10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type:Provides unauthorized access, Allows partial confidentiality, integrity, and availability violation; Allows unauthorized disclosure of information; Allows disruption of service
References to Advisories, Solutions, and Tools
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External Source: XF
Name: rubyonrails-validatedigest-sec-bypass(51528)
Type: Patch Information
External Source: VUPEN
Name: ADV-2009-1802
Type: Advisory; Patch Information
External Source: BID
Name: 35579
Type: Patch Information
External Source: CONFIRM
Name: http://weblog.rubyonrails.org/2009/6/3/security-problem-with-authenticate_with_http_digest
Type: Patch Information
External Source: MISC
Name: http://n8.tumblr.com/post/117477059/security-hole-found-in-rails-2-3s
Type: Patch Information
External Source: SECUNIA
Name: 35702
Type: Advisory