Ruby 1.9.0以下のWEBrickにディレクトリ遷移攻撃脆弱性

Security 4月 22, 2008
(Last Updated On: 2008年4月22日)

WEBrick+Windowsでサービスしているところはあまり無いと思いますがファイルを不正に読み取られる可能性があります。

CVE-2008-1891

Overview

Directory traversal vulnerability in WEBrick in Ruby 1.9.0 and earlier, when using NTFS or FAT filesystems, allows remote attackers to read arbitrary CGI files via a trailing (1) + (plus), (2) %2b (encoded plus), (3) . (dot), (4) %2e (encoded dot), or (5) %20 (encoded space) character in the URI, possibly related to the WEBrick::HTTPServlet::FileHandler and WEBrick::HTTPServer.new functionality and the :DocumentRoot option.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base score: 5.0 (Medium) (AV:N/AC:L/Au:N/C:P/I:N/A:N) (legend)
Impact Subscore: 2.9
Exploitability Subscore: 10.0

Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information

投稿者: yohgaki