Apache Tomcat NIO HTTP Connector Cache Bug Lets Remote Users Obtain Potentially Sensitive Information from Other User Requests
SecurityTracker Alert ID: 1037432|
SecurityTracker URL: http://securitytracker.com/id/1037432
(Links to External Site)
Updated: Jan 5 2017|
Original Entry Date: Dec 13 2016
Disclosure of user information|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): 6.0.16 to 6.0.48, 7.0.0 to 7.0.73, 8.0.0.RC1 to 8.0.39, 8.5.0 to 8.5.8, 9.0.0.M1 to 9.0.0.M13|
A vulnerability was reported in Apache Tomcat. A remote user can obtain potentially sensitive information on the target system.|
A remote user can send a specially crafted request to trigger a flaw in the NIO HTTP Connector and cause data to be added to the processor cache multiple times, which may allow the remote user to view potentially sensitive information from other user requests.
Systems using the NIO HTTP connector are affected.
Evgenij Ryazanov reported this vulnerability.
A remote user can obtain potentially sensitive information from other user requests.|
The vendor has issued a fix (6.0.49, 7.0.74, and 8.0.40 [pending]; 8.5.9, 9.0.0.M15).|
The vendor advisories are available at:
Vendor URL: tomcat.apache.org/security-9.html (Links to External Site)
Access control error|
|Underlying OS: Linux (Any), UNIX (Any), Windows (Any)|
This archive entry has one or more follow-up message(s) listed below.|
Source Message Contents
Subject: [oss-security] [SECURITY] CVE-2016-8745 Apache Tomcat Information Disclosure|
CVE-2016-8745 Apache Tomcat Information Disclosure
Vendor: The Apache Software Foundation
Apache Tomcat 9.0.0.M1 to 9.0.0.M13
Apache Tomcat 8.5.0 to 8.5.8
Earlier versions are not affected.
The refactoring of the Connector code for 8.5.x onwards introduced a
regression in the error handling of the send file code for the NIO HTTP
connector. An error during send file processing resulted in the current
Processor object being added to the Processor cache multiple times. This
in turn meant that the same Processor could be used for concurrent
requests. Sharing a Processor can result in information leakage between
requests including, not not limited to, session ID and the response body.
Users of the NIO HTTP connector with the affected versions should apply
one of the following mitigations
- Switch to the NIO2 HTTP or APR HTTP connector
- Disable send file
- Upgrade to Apache Tomcat 9.0.0.M15 or later
(Apache Tomcat 9.0.0.M14 has the fix but was not released)
- Upgrade to Apache Tomcat 8.5.9 or later
This issue was reported publicly as Bug 60409  and the security
implications identified by the Tomcat security team.