CVE-2023-41835 : What You Need to Know

Apache Struts vulnerability allows attackers to cause excessive disk usage by performing a Multipart request with fields that exceed the maxStringLength limit. Upgrading to fixed versions is recommended.

Understanding CVE-2023-41835

This CVE involves a vulnerability in Apache Struts that can lead to excessive disk usage on the server.

What is CVE-2023-41835?

When a Multipart request with fields exceeding the maxStringLength limit is executed, the upload files will remain on the server's disk even if the request is denied.

The Impact of CVE-2023-41835

The vulnerability could result in excessive disk consumption and potentially lead to denial of service if disk space is completely exhausted.

Technical Details of CVE-2023-41835

This section provides specific technical details about the CVE.

Vulnerability Description

The issue occurs when certain fields in a Multipart request exceed the predefined limit, causing files to be saved on the server despite denial.

Affected Systems and Versions

Product: Apache Struts
Vendor: Apache Software Foundation
Affected Versions:
Apache Struts 2.0.0 (<= 2.5.31)
Apache Struts 6.1.2.1 (<= 6.3.0)

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted Multipart requests with oversized fields to exhaust disk space.

Mitigation and Prevention

To address this vulnerability, immediate steps and long-term security practices are recommended.

Immediate Steps to Take

Users are advised to upgrade to Apache Struts versions Struts 2.5.32, 6.1.2.2, or 6.3.0.1 or newer, which contain fixes for this issue.

Long-Term Security Practices

Implement proper input validation mechanisms and monitor disk usage to detect abnormal behavior that could indicate an attack.

Patching and Updates

Regularly check for security updates and patches from Apache Software Foundation to stay protected against known vulnerabilities.