Unspecified vulnerability in Rack::Auth::AbstractRequest in Rack 1.1.x before 1.1.5, 1.2.x before 1.2.7, 1.3.x before 1.3.9, and 1.4.x before 1.4.4 allows remote attackers to cause a denial of service via unknown vectors related to "symbolized arbitrary strings."
https://bugzilla.redhat.com/show_bug.cgi?id=895384
http://www.debian.org/security/2013/dsa-2783
http://rhn.redhat.com/errata/RHSA-2013-0548.html
http://rhn.redhat.com/errata/RHSA-2013-0544.html
http://lists.opensuse.org/opensuse-updates/2013-03/msg00048.html