SB2011082908 - Input validation error in Ruby on Rails

Description

This security bulletin contains information about 1 vulnerability.

1) Input validation error (CVE-ID: CVE-2011-3187)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to to_s method in actionpack/lib/action_dispatch/middleware/remote_ip.rb in Ruby on Rails does not validate the X-Forwarded-For header in requests from IP addresses on a Class C network. A remote attacker can pass specially crafted input to the application and gain access to potentially sensitive information.

Remediation

Install update from vendor's website.

References

• http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0337.html
• http://webservsec.blogspot.com/2011/02/ruby-on-rails-vulnerability.html
• http://www.openwall.com/lists/oss-security/2011/08/17/1
• http://www.openwall.com/lists/oss-security/2011/08/19/11
• http://www.openwall.com/lists/oss-security/2011/08/20/1
• http://www.openwall.com/lists/oss-security/2011/08/22/13
• http://www.openwall.com/lists/oss-security/2011/08/22/14
• http://www.openwall.com/lists/oss-security/2011/08/22/5
• https://bugzilla.novell.com/show_bug.cgi?id=673010