Directory traversal vulnerability in WEBrick in Ruby 1.8 before
1.8.5-p115 and 1.8.6-p114, and 1.9 through 1.9.0-1, when running on
systems that support backslash (\) path separators or case-insensitive
file names, allows remote attackers to access arbitrary files via (1)
"..%5c" (encoded backslash) sequences or (2) filenames that match
patterns in the :NondisclosureName option.
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