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Category:   Application (Web Server/CGI)  >   Apache Tomcat Vendors:   Apache Software Foundation
Apache Tomcat HTTP BIO Connector Error Discloses Information From Different Requests to Remote Users
SecurityTracker Alert ID:  1025303
SecurityTracker URL:
CVE Reference:   CVE-2011-1475   (Links to External Site)
Date:  Apr 7 2011
Impact:   Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.0.0 - 7.0.11
Description:   A vulnerability was reported in Apache Tomcat. A remote user may be able to obtain information from a different request.

When using HTTP pipelining, the system may return information from a different request to a remote user. The vulnerability resides in the HTTP BIO connector.

Brad Piles reported this vulnerability.

Impact:   A remote user may be able to obtain information from a different request.
Solution:   The vendor has issued a fix (7.0.12).

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  [SECURITY] CVE-2011-1475 Apache Tomcat information disclosure

CVE-2011-1475 Apache Tomcat information disclosure

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
- Tomcat 7.0.0 to 7.0.11
- Earlier versions are not affected

Changes introduced to the HTTP BIO connector to support Servlet 3.0
asynchronous requests did not fully account for HTTP pipelining. As a
result, when using HTTP pipelining a range of unexpected behaviours
occurred including the mixing up of responses between requests. While
the mix-up in responses was only observed between requests from the same
user, a mix-up of responses for requests from different users may also
be possible.

Users of affected versions should apply one of the following mitigations:
- Upgrade to a Tomcat 7.0.12 or later
- Switch to the NIO or APR/native HTTP connectors that do not exhibit
this issue

This issue was identified by Brad Piles and reported via the public ASF
Bugzilla issue tracking system.
The Apache Tomcat security team requests that security vulnerability
reports are made privately to in the first


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