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Category:   Application (Web Server/CGI)  >   Apache Tomcat Vendors:   Apache Software Foundation
Apache Tomcat JK ISAPI Connector Buffer Overflow May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1036969
SecurityTracker URL:  http://securitytracker.com/id/1036969
CVE Reference:   CVE-2016-6808   (Links to External Site)
Date:  Oct 6 2016
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): JK 1.2.0 - 1.2.41
Description:   A vulnerability was reported in Apache Tomcat JK ISAPI Connector. A remote user may be able to execute arbitrary code on the target system.

A remote user can send a specially crafted URI to the target virtual host to trigger a buffer overflow in the JK ISAPI connector and potentially execute arbitrary code on the target system.

[Editor's note: The report does not confirm code execution.]

The Apache Tomcat Security Team reported this vulnerability.

Impact:   A remote user may be able to execute arbitrary code on the target system.
Solution:   The vendor has issued a fix (JK ISAPI Connector 1.2.42).

The vendor advisory is available at:

http://tomcat.apache.org/security-jk.html#Fixed_in_Apache_Tomcat_JK_Connector_1.2.42

Vendor URL:  tomcat.apache.org/security-jk.html#Fixed_in_Apache_Tomcat_JK_Connector_1.2.42 (Links to External Site)
Cause:   Boundary 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 26 2017 (Red Hat Issues Fix for Red Hat JBoss Core Services) Apache Tomcat JK ISAPI Connector Buffer Overflow May Let Remote Users Execute Arbitrary Code
Red Hat has issued a fix for Red Hat JBoss Core Services for Red Hat Enterprise Linux 6 and 7.



 Source Message Contents

Subject:  [oss-security] [SECURITY] CVE-2016-6808 Apache Tomcat JK ISAPI Connector buffer overflow

CVE-2016-6808 Apache Tomcat JK ISAPI Connector buffer overflow

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:
- Apache Tomcat JK ISAPI Connector 1.2.0 to 1.2.41

Description
The IIS/ISAPI specific code implements special handling when a virtual
host is present. The virtual host name and the URI are concatenated to
create a virtual host mapping rule. The length checks prior to writing
to the target buffer for this rule did not take account of the length of
the virtual host name, creating the potential for a buffer overflow.
It is not known if this overflow is exploitable.

Mitigation
Users of affected versions should apply one of the following mitigations
- Upgrade to Apache Tomcat JK ISAPI Connector 1.2.42
- Where available, use IIS configuration to restrict the maximum URI
  length to 4095 - (the length of the longest virtual host name)

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


References:
[1] http://tomcat.apache.org/security-jk.html
 
 


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