CVE-2008-1891

Published: 18 April 2008

Directory traversal vulnerability in WEBrick in Ruby 1.8.4 and earlier, 1.8.5 before 1.8.5-p231, 1.8.6 before 1.8.6-p230, 1.8.7 before 1.8.7-p22, and 1.9.0 before 1.9.0-2, 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.

Notes

this is only a problem if serving from a windows filesystem. This
configuration is known to be broken. From changelog addition in svn r16454:
Note: NTFS/FAT filesystem should not be published by the platforms
other than Windows. Pathname interpretation (including short
filename) is less than perfect.

Status

References

• https://www.cve.org/CVERecord?id=CVE-2008-1891
• NVD
• Launchpad
• Debian