Products bundled with Apache Tomcat are subject to a potential security exposure due to the Java HashTable implementation which can result in a Denial of Service (DoS) exposure when using Web based applications such as IBM Rational DOORS Web Access (DWA).
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CVE ID: CVE-2011-4858
Description: Apache Tomcat before 5.5.35, 6.x before 6.0.35, and 7.x before 7.0.23 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.
Affected Products and Versions
DOORS Web Access is deployed on Apache Tomcat 6.0.32 or earlier and is therefore impacted by this vulnerability which can cause performance or Denial of Service (DoS) issues.
You are advised to update to version 6.0.35 of Apache Tomcat to protect against this vulnerability. The download can be found here: http://tomcat.apache.org/download-60.cgi#6.0.35.
Review technote 1580689: How to upgrade Tomcat bundled with the IBM Rational DOORS Web Access server for details.
Workarounds and Mitigations
* 15 February 2012: Original copy published
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.