CVE-2023-28709 : Exploit Details and Defense Strategies

This CVE-2023-28709 pertains to an incomplete fix for CVE-2023-24998 in Apache Tomcat versions 8.5.85 to 8.5.87, 9.0.71 to 9.0.73, 10.1.5 to 10.1.7, and 11.0.0-M2 to 11.0.0-M4. This vulnerability could lead to a denial of service if specific non-default HTTP connector settings were utilized.

Understanding CVE-2023-28709

CVE-2023-28709 highlights a security loophole in Apache Tomcat that could potentially be exploited for a denial of service attack.

What is CVE-2023-28709?

The vulnerability allows for bypassing upload request part limitations, resulting in a possible denial of service, if the maxParameterCount value is reached using query string parameters and a request with exactly this count of parameters is submitted.

The Impact of CVE-2023-28709

If this vulnerability is exploited, it could lead to a denial of service attack, impacting the availability of the Apache Tomcat web server and potentially disrupting services that rely on it.

Technical Details of CVE-2023-28709

This section provides more detailed technical insights into the vulnerability.

Vulnerability Description

The incomplete fix for CVE-2023-24998 in the specified versions of Apache Tomcat allows an attacker to bypass upload request part limitations by manipulating query string parameters, potentially leading to a denial of service.

Affected Systems and Versions

The impacted versions include Apache Tomcat 8.5.85 to 8.5.87, 9.0.71 to 9.0.73, 10.1.5 to 10.1.7, and 11.0.0-M2 to 11.0.0-M4.

Exploitation Mechanism

Exploiting this vulnerability involves reaching the maxParameterCount using query string parameters and submitting a request with exactly this count of parameters, thereby bypassing the upload request part limitations.

Mitigation and Prevention

To safeguard systems from the risks associated with CVE-2023-28709, certain mitigation strategies can be implemented.

Immediate Steps to Take

Update Apache Tomcat to a patched version that addresses this vulnerability.
Monitor network traffic and behavior for any signs of exploitation.

Long-Term Security Practices

Regularly apply security patches and updates to ensure software integrity.
Implement best practices for secure configuration of web servers to minimize vulnerabilities.

Patching and Updates

It is crucial to apply the latest security patches released by Apache Software Foundation for the affected versions of Apache Tomcat to remediate the vulnerability and enhance the security posture of the system.