Vulnerability Note VU#404515

Ruby WEBrick vulnerable to directory traversal

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.

I. 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."

II. Impact

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

III. 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

Vendor	Status	Date Updated
Ruby	Vulnerable	4-Apr-2008

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

Date Public	03/06/2008
Date First Published	04/14/2008 03:20:05 PM
Date Last Updated	04/14/2008
CERT Advisory
CVE Name	CVE-2008-1145
US-CERT Technical Alerts
Metric	12.83
Document Revision	9