Sinatra rack-protection versions 1.5.4 and 2.0.0.rc3 and earlier contains a timing attack vulnerability in the CSRF token checking that can result in signatures can be exposed. This attack appear to be exploitable via network connectivity to the ruby application. This vulnerability appears to have been fixed in 1.5.5 and 2.0.0.
note: there is already a bump request at bug 645364
Gentoo Security Padawan
dev-ruby/rack-protection-1.5.5 has been added. we already have fixed versions for the 2.x series.
tree is clean