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securityvulnsSecurityvulnsSECURITYVULNS:DOC:20328
HistoryAug 12, 2008 - 12:00 a.m.

Apache Tomcat <= 6.0.18 UTF8 Directory Traversal Vulnerability

2008-08-1200:00:00
vulners.com
35

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
Solution:

  • 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.
    References:
  • http://tomcat.apache.org/security.html
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2938
    History:
  • 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.

Description
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)

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

http://www.target.com/%c0%ae%c0%ae/%c0%ae%c0%ae/%c0%ae%c0%ae/foo/bar

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