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Category:   Application (Web Server/CGI)  >   Apache Tomcat Vendors:   Apache Software Foundation
Apache Tomcat ResourceLinkFactory Flaw Lets Applications Access Global Resources
SecurityTracker Alert ID:  1037145
SecurityTracker URL:  http://securitytracker.com/id/1037145
CVE Reference:   CVE-2016-6797   (Links to External Site)
Date:  Oct 28 2016
Impact:   Disclosure of system information, Host/resource access via network, Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0.0 to 6.0.45, 7.0.0 to 7.0.70, 8.0.0.RC1 to 8.0.36, 8.5.0 to 8.5.4, 9.0.0.M1 to 9.0.0.M9
Description:   A vulnerability was reported in Apache Tomcat. An application can gain access to global resources the target system.

A web application can exploit a flaw in the ResourceLinkFactory to access arbitrary global JNDI resources.

Impact:   A web application can access arbitrary global JNDI resources.
Solution:   The vendor has issued a fix (6.0.47, 7.0.72, 8.0.37, 8.5.5, 9.0.0.M10).

The vendor advisories are available at:

http://tomcat.apache.org/security-6.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-8.html
http://tomcat.apache.org/security-9.html

Vendor URL:  tomcat.apache.org/security-8.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 18 2017 (IBM Issues Fix for IBM Rational License Key Server) Apache Tomcat ResourceLinkFactory Flaw Lets Applications Access Global Resources
IBM has issued a fix for IBM Rational License Key Server Administration and Reporting Tool.
Aug 3 2017 (Red Hat Issues Fix) Apache Tomcat ResourceLinkFactory Flaw Lets Applications Access Global Resources
Red Hat has issued a fix for Red Hat Enterprise Linux 7.



 Source Message Contents

Subject:  [oss-security] [SECURITY] CVE-2016-6797 Apache Tomcat Unrestricted Access to Global Resources

CVE-2016-6797 Apache Tomcat Unrestricted Access to Global Resources

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.0.M1 to 9.0.0.M9
Apache Tomcat 8.5.0 to 8.5.4
Apache Tomcat 8.0.0.RC1 to 8.0.36
Apache Tomcat 7.0.0 to 7.0.70
Apache Tomcat 6.0.0 to 6.0.45
Earlier, unsupported versions may also be affected.

Description
The ResourceLinkFactory did not limit web application access to global
JNDI resources to those resources explicitly linked to the web
application. Therefore, it was possible for a web application to access
any global JNDI resource whether an explicit ResourceLink had been
configured or not.

Mitigation
Users of affected versions should apply one of the following mitigations
- Upgrade to Apache Tomcat 9.0.0.M10 or later
- Upgrade to Apache Tomcat 8.5.5 or later
- Upgrade to Apache Tomcat 8.0.37 or later
- Upgrade to Apache Tomcat 7.0.72 or later
  (Apache Tomcat 7.0.71 has the fix but was not released)
- Upgrade to Apache Tomcat 6.0.47 or later
  (Apache Tomcat 6.0.46 has the fix but was not released)

Credit:
This issue was discovered by the Apache Tomcat Security Team.

References:
[1] http://tomcat.apache.org/security-9.html
[2] http://tomcat.apache.org/security-8.html
[3] http://tomcat.apache.org/security-7.html
[4] http://tomcat.apache.org/security-6.html
 
 


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