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Ruby WEBrick Information Disclosure Vulnerabilities
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Secunia Advisory:
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SA29232
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Release Date:
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2008-03-06
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Last Update:
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2008-04-15
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Popularity:
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3,155 views
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Critical:
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Moderately critical
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Impact:
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Exposure of system information
Exposure of sensitive information
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Ruby 1.8.x
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| CVE reference: | CVE-2008-1145
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Description:
Some vulnerabilities have been reported in Ruby, which can be exploited by malicious people to disclose sensitive information.
1) Input passed via the URL to applications using "WEBrick::HTTPServlet::FileHandler" or "WEBrick::HTTPServer.new" with the ":DocumentRoot" option is not properly sanitised before being used. This can be exploited to display arbitrary files via directory traversal attacks of the form "..%5c..%5c".
Successful exploitation requires that the application is running on an operating system accepting the backslash character as a path separator (e.g. Windows).
2) The vulnerability is caused due to an error within the "WEBrick::HTTPServlet::FileHandler" class, and within the "WEBrick::HTTPServer.new" method when handling the ":NondisclosureName" option. This can be exploited to disclose the content of arbitrary files with a filename matching the pattern specified in the ":NondisclosureName" option.
Successful exploitation requires that the application is running on an operating system using a case insensitive filesystem (e.g. Windows or Mac OS X).
The vulnerabilities are reported in versions prior to 1.8.4, 1.8.5 versions prior to 1.8.5-p115, 1.8.6 versions prior to 1.8.6-p114, and 1.9 versions prior to and including 1.9.0-1.
Solution:
Update to 1.8.5-p115 or 1.8.6-p114, or apply the vendor patch for version 1.9.0-1.
ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.0-1-webrick-vulnerability-fix.diff
Provided and/or discovered by:
The vendor credits Digital Security Research.
Changelog:
2008-03-11: Added CVE reference.
2008-04-15: Added link to US-CERT.
Original Advisory:
http://www.ruby-lang.org/en/news/2008/03/03/webrick-file-access-vulnerability/
Other References:
US-CERT VU#404515:
http://www.kb.cert.org/vuls/id/404515
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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