CVE-2012-6109: Medium severity rack-project rack vulnerability

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.

Upstream released [1] Rack 1.4.2, 1.3.7, 1.2.6, and 1.1.4 to fix a denial of service condition when Rack parses content with a certain Content-Disposition header as noted in the original report [2].

This has been fixed in git [3].

Additionally, a second flaw that was fixed in 1.4.4, 1.3.9, 1.2.7, and 1.1.5 was also announced [4] that creates a minor denial of service condition, this time in the Rack::Auth::AbstractRequest, where it symbolized arbitrary strings (apparently this has something to do with authentication, but there is no further information provided other than the fix [5] itself, which is noted as "a breaking API change").

[1] http://rack.github.com/ [2] https://groups.google.com/forum/#!msg/rack-devel/1w4fWEgTdI/XAkSNHjtdTsJ [3] https://github.com/rack/rack/commit/4fc44671b3cad569421f4f8b775c0590b86f575e [4] https://groups.google.com/forum/#!topic/rack-devel/ImYOqcGiksw/discussion [5] https://github.com/rack/rack/commit/0c76175fcccad74ba2f991c487d3669c28a297c8

— Red Hat