rack/file.rb (Rack::File) in Rack 1.5.x before 1.5.2 and 1.4.x before...

Vulnerability Description

rack/file.rb (Rack::File) in Rack 1.5.x before 1.5.2 and 1.4.x before 1.4.5 allows attackers to access arbitrary files outside the intended root directory via a crafted PATH_INFO environment variable, probably a directory traversal vulnerability that is remotely exploitable, aka "symlink path traversals."

References

• https://groups.google.com/forum/#%21msg/rack-devel/mZsuRonD7G8/DpZIOmMLbOgJ
• https://gist.github.com/rentzsch/4736940
• http://secunia.com/advisories/52033
• http://rack.github.com/
• https://bugzilla.redhat.com/show_bug.cgi?id=909071
• https://groups.google.com/forum/#%21msg/rack-devel/bf937jPZxJM/1s6x95vIhmAJ
• https://github.com/rack/rack/commit/6f237e4c9fab649d3750482514f0fde76c56ab30
• http://lists.opensuse.org/opensuse-updates/2013-03/msg00048.html
• https://github.com/rack/rack/blob/master/lib/rack/file.rb#L56
• https://bugzilla.redhat.com/show_bug.cgi?id=909072