CVE-2003-0866: Apache Tomcat Denial of Service vulnerability in the Catalina package
Summary
CVE-2003-0866: Apache Tomcat Denial of Service vulnerability in the Catalina package. Affects org.apache.tomcat:tomcat versions >= 4.0, < 4.1.0. Fixed in 4.1.0. How to fix ↓
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Background
Apache Tomcat is an open-source web server and servlet container that is used to serve Java applications. The Catalina package is a component of Tomcat responsible for handling HTTP requests. It is an essential part of the server's functionality and allows for the processing of incoming requests. However, versions of Tomcat 4.0.x up to 4.0.6 are vulnerable to a Denial of Service (DoS) attack when receiving requests that do not follow the HTTP protocol.
Vulnerability Detail
The vulnerability in the Catalina package of Tomcat allows remote attackers to cause a denial of service by sending multiple requests that do not adhere to the HTTP protocol. When Tomcat encounters such requests, it rejects them. However, this rejection process consumes server resources, leading to a potential DoS condition. The impact of this vulnerability can range from degraded server performance to complete unavailability, depending on the severity and volume of the attack.
How To Fix
Minimum fixed version
4.1.0
This is the first release that contains the fix.
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Workaround
If upgrading to a fixed version is not immediately feasible, a temporary workaround can be implemented. One possible workaround is to deploy a reverse proxy or load balancer in front of the vulnerable Tomcat server. The proxy or load balancer can be configured to filter out requests that do not adhere to the HTTP protocol, preventing them from reaching the vulnerable server. This can help mitigate the risk of a DoS attack while planning and implementing the upgrade to a fixed version.
Conclusion
The Apache Tomcat vulnerability in the Catalina package exposes servers to potential denial of service attacks. It is crucial to upgrade to a fixed version of Tomcat, such as version 4.1.0 or later, to mitigate the risk. In the meantime, implementing a temporary workaround, such as deploying a reverse proxy or load balancer, can provide additional protection. For further assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a denial of service condition, potentially causing degraded server performance or complete unavailability.
Versions 4.0.x up to 4.0.6 of Tomcat are vulnerable to this issue.
You can use Vulert Playground (https://vulert.com/scanner) to check if your application is affected by this vulnerability. Vulert Playground allows you to analyze your pom.xml file and provides real-time alerts for open-source vulnerabilities.
Yes, upgrading to Tomcat version 4.1.0 or later resolves the vulnerability.
A temporary workaround is to deploy a reverse proxy or load balancer in front of the vulnerable Tomcat server to filter out non-compliant requests.
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