lib/rack/multipart.rb in Rack before 1.1.4, 1.2.x before 1.2.6, 1.3.x before 1.3.7, and 1.4.x before 1.4.2 uses an incorrect regular expression, which allows remote attackers to cause a denial of service (infinite loop) via a crafted Content-Disposion header.
rack.github.com/
rhn.redhat.com/errata/RHSA-2013-0544.html
rhn.redhat.com/errata/RHSA-2013-0548.html
access.redhat.com/errata/RHSA-2013:0544
access.redhat.com/errata/RHSA-2013:0548
access.redhat.com/knowledge/docs/
access.redhat.com/security/cve/CVE-2012-6109
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=895277
github.com/rack/rack/blob/master/README.rdoc
github.com/rack/rack/commit/c9f65df37a151821eb88ddd1dc404b83e52c52d5
groups.google.com/forum/#!msg/rack-devel/1w4_fWEgTdI/XAkSNHjtdTsJ
groups.google.com/forum/#%21msg/rack-devel/1w4_fWEgTdI/XAkSNHjtdTsJ
rhn.redhat.com/errata/RHSA-2013-0548.html