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.

James Tucker (raggi) reports:

CVE: CVE-2013-0263 Software: Rack (rack.github.com) Type of vulnerability: Timing attack, leading to potential RCE

Vulnerable code: https://github.com/rack/rack/blob/master/lib/rack/session/cookie.rb#L149 Patch: https://github.com/rack/rack/commit/0cd7e9aa397f8ebb3b8481d67dbac8b4863a7f07 https://github.com/rack/rack/commit/9a81b961457805f6d1a5c275d053068440421e11

Versions affected: All prior versions. Versions fixed: 1.1.6, 1.2.8, 1.3.10, 1.4.5, 1.5.2 Reporter: Ben Murphy

Reference: http://seclists.org/oss-sec/2013/q1/271

multipart/parser.rb in Rack 1.3.x before 1.3.8 and 1.4.x before 1.4.3 allows remote attackers to cause a denial of service (memory consumption and out-of-memory error) via a long string in a Multipart HTTP packet.

A 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").

[4] https://groups.google.com/forum/#!topic/rack-devel/ImYOqcGiksw/discussion [5] https://github.com/rack/rack/commit/0c76175fcccad74ba2f991c487d3669c28a297c8