Vulnerability Note VU#404515

Overview

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.

Description

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."

Impact

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

Solution

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."

Systems Affected (Learn More)

Vendor	Status	Date Notified	Date Updated
Ruby	Affected	-	04 Apr 2008

If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

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

References

• http://seclists.org/bugtraq/2008/Mar/0056.html
• http://secunia.com/advisories/29232/
• http://www.ruby-lang.org/en/news/2008/03/03/webrick-file-access-vulnerability/
• http://www.securiteam.com/securitynews/5TP0F1PNQK.html

Credit

Thanks to Alexandr Polyakov for reporting this vulnerability.

This document was written by John Hollenberger.

Other Information

• CVE IDs: CVE-2008-1145
• Date Public: 06 Mar 2008
• Date First Published: 14 Apr 2008
• Date Last Updated: 14 Apr 2008
• Severity Metric: 12.83
• Document Revision: 9