Apache Tomcat <= 6.0.18 UTF8 Directory Traversal Vulnerability

From: emericboit@yahoo.fr
To: bugtraq@securityfocus.com
Subject: Apache Tomcat <= 6.0.18 UTF8 Directory Traversal Vulnerability

Title: Apache Tomcat Directory Traversal Vulnerability
Author: Simon Ryeo(bar4mi (at) gmail.com, barami (at) ahnlab.com)
Severity: High
Impact: Remote File Disclosure
Vulnerable Version: prior to 6.0.18
 - Best Choice: Upgrade to 6.0.18 (http://tomcat.apache.org)
 - Hot fix: Disable allowLinking or do not set URIencoding to utf8 in order to avoid this vulnerability.
 - Tomcat 5.5.x and 4.1.x Users: The fix will be included in the next releases. Please apply the hot fix until next release.
 - http://tomcat.apache.org/security.html
 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2938
 - 07.17.2008: Initiate notify (To Apache Security Team)
 - 08.02.2008: Responsed this problem fixed and released new version
 - 08.05.2008: Notify disclosure (To Apache Tomcat Security Team)
 - 08.10.2008: Responsed with some suggestions.

As Apache Security Team, this problem occurs because of JAVA side.
If your context.xml or server.xml allows 'allowLinking'and 'URIencoding' as
'UTF-8', an attacker can obtain your important system files.(e.g.  /etc/passwd)

If your webroot directory has three depth(e.g /usr/local/wwwroot), An
attacker can access arbitrary files as below. (Proof-of-concept)


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