CVE-2026-24729: Interinfo DreamMaker RCE Vulnerability

CVE-2026-24729 Overview

An unrestricted upload of file with dangerous type vulnerability (CWE-434) has been identified in the file upload function of Interinfo DreamMaker. This critical vulnerability allows remote attackers to upload malicious class files, leading to arbitrary system command execution on affected systems. The vulnerability affects versions released before 2025/10/22.

Critical Impact

Remote attackers can achieve full system compromise through arbitrary command execution by uploading malicious Java class files without authentication or restrictions.

Affected Products

• Interinfo DreamMaker versions before 2025/10/22

Discovery Timeline

• 2026-01-30 - CVE-2026-24729 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2026-24729

Vulnerability Analysis

This vulnerability stems from a fundamental failure to validate file types during the upload process. The file upload function in Interinfo DreamMaker does not properly restrict the types of files that can be uploaded, allowing attackers to submit executable content such as Java class files. Once uploaded, these malicious files can be executed by the server, granting attackers the ability to run arbitrary system commands with the privileges of the application.

The network-accessible nature of this vulnerability combined with no authentication requirements makes it particularly dangerous. An attacker requires no prior access or credentials to exploit this flaw, and no user interaction is needed for successful exploitation. The impact extends beyond the vulnerable component, potentially affecting adjacent systems in the same network environment.

Root Cause

The root cause of CVE-2026-24729 is improper input validation in the file upload functionality. The application fails to implement adequate file type restrictions, allowing dangerous file types such as .class files to be uploaded. Properly secured file upload mechanisms should validate file extensions, verify MIME types, inspect file headers (magic bytes), and ideally store uploaded files in locations that prevent direct execution.

Attack Vector

The attack leverages the network-accessible file upload endpoint in Interinfo DreamMaker. An attacker crafts a malicious Java class file containing code to execute system commands. By uploading this file through the vulnerable upload function, the attacker can then trigger its execution, resulting in remote code execution on the target server.

The exploitation flow typically involves:

1. Identifying the vulnerable file upload endpoint in Interinfo DreamMaker
2. Crafting a malicious Java class file with embedded command execution capabilities
3. Uploading the malicious file through the unrestricted upload function
4. Triggering execution of the uploaded class file
5. Gaining arbitrary command execution on the target system

For additional technical details, refer to the Zuso AI Security Advisory.

Detection Methods for CVE-2026-24729

Indicators of Compromise

• Presence of unexpected .class files in upload directories or web-accessible locations
• Unusual process spawning from Java or web application processes
• Outbound connections from the DreamMaker application to unknown external hosts
• Evidence of command execution artifacts in system logs correlating with file upload timestamps

Detection Strategies

• Monitor file upload directories for executable file types including .class, .jar, .jsp, and .war files
• Implement file integrity monitoring on directories accessible by the DreamMaker application
• Deploy web application firewall (WAF) rules to detect and block uploads of Java class files
• Review web server access logs for POST requests to upload endpoints with suspicious file extensions

Monitoring Recommendations

• Enable verbose logging on the DreamMaker application to capture all file upload activities
• Configure SIEM alerts for detection of Java class file creation in non-standard directories
• Monitor for unusual child processes spawned by the web application or Java runtime
• Implement network traffic analysis to detect potential command and control communications following exploitation

How to Mitigate CVE-2026-24729

Immediate Actions Required

• Update Interinfo DreamMaker to a version released on or after 2025/10/22
• Implement strict file upload validation including allowlisting of permitted file extensions
• Restrict upload directory permissions to prevent execution of uploaded files
• Consider temporarily disabling the file upload functionality until patches are applied

Patch Information

Interinfo has addressed this vulnerability in DreamMaker versions released on or after 2025/10/22. Organizations should prioritize updating to the latest available version. For detailed patch information, consult the Zuso AI Security Advisory.

Workarounds

• Configure web server to deny execution of files in upload directories using appropriate directives
• Implement a Web Application Firewall (WAF) to filter and block malicious file uploads
• Restrict network access to the file upload functionality to trusted IP ranges only
• Deploy file type verification at multiple layers including client-side, server-side, and at the reverse proxy level

If immediate patching is not possible, administrators should implement strict file upload controls by configuring their web server to prevent execution of uploaded content. For Apache servers, this can be achieved by adding execution restrictions to the upload directory configuration. For Nginx, ensure that locations serving uploaded files do not pass requests to backend processors. Additionally, consider implementing file extension allowlisting at the application level to permit only safe file types such as images and documents.