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Ruby WEBrick vulnerable to directory traversal

Vulnerability Note VU#404515

Original Release Date: 2008-04-14 | Last Revised: 2008-04-14


Ruby WEBrick is vulnerable to a directory traversal on systems that support backslash (\) path separators. This vulnerability may allow an attacker to access arbitrary files outside of the web server root directory.


WEBrick is a Ruby library program to build HTTP servers. WEBrick contains a directory traversal vulnerability in systems that accept backslash (\) as a path separator. A remote attacker may be able to exploit this vulnerability by using encoded backslash sequences (..%5c). For more information please see "File access vulnerability of WEBrick."


A remote attacker could gain access to arbitrary files outside of the web server root directory.


Apply an Update

Ruby has released version 1.8.5-p115 and 1.8.6-p114 for the 1.8 series. For the 1.9 series, apply the patch referenced in "File access vulnerability of WEBrick."

Vendor Information

Affected   Unknown   Unaffected


Updated:  April 04, 2008



Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Please see

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A



Thanks to Alexandr Polyakov for reporting this vulnerability.

This document was written by John Hollenberger.

Other Information

CVE IDs: CVE-2008-1145
Severity Metric: 12.83
Date Public: 2008-03-06
Date First Published: 2008-04-14
Date Last Updated: 2008-04-14 19:20 UTC
Document Revision: 9

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