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Home arrow SecurityAlert Database

Arrow  Topic :

Apache Tomcat <= 6.0.18 UTF8 Directory Traversal Vulnerability


Arrow  SecurityAlert : 4148
Arrow  CVE : CVE-2008-2938
Arrow  CWE : CWE-22
Arrow  SecurityRisk : Low  Security Risk Low  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Victim interaction required : No
Arrow  Exploit Available : Yes
  ExploitAlert :   4473
Arrow  Credit : bar4mi
Arrow  Published : 15.08.2008
Arrow  Updated : 22.08.2008

Arrow  Affected Software : Apache Software Foundation, Tomcat, 6.0.16



Arrow  Advisory Content :  

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



Arrow  References :

http://securityreason.com/expldownload/1/4473/1 (Exploit)
http://tomcat.apache.org/security-6.html
http://www.milw0rm.com/exploits/6229




Arrow  Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.
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