A critical vulnerability exists in multiple versions of Adobe ColdFusion that allows a high-privileged attacker to upload a malicious file and execute arbitrary code on the server. Successful exploitation could lead to a complete compromise of the affected system, allowing an attacker to steal data, disrupt services, or gain a foothold in the network.

The vulnerability is an Unrestricted Upload of File with Dangerous Type. An authenticated attacker with high privileges can exploit this flaw to bypass file type restrictions and upload a malicious file (e.g., a .cfm or .jsp web shell) to a web-accessible directory on the server. By subsequently accessing the uploaded file via a URL, the attacker can trigger its execution, leading to arbitrary code execution with the permissions of the ColdFusion service account. The exploit does not require interaction from any other user and allows the attacker to affect resources beyond the security scope of the application itself.

This vulnerability is rated as critical severity with a CVSS score of 9.1. A successful exploit would result in a complete compromise of the affected ColdFusion server. The potential business impact is severe, including the theft or manipulation of sensitive data, deployment of ransomware, complete service disruption, and the use of the compromised server as a pivot point to attack other internal network resources. This can lead to significant financial loss, reputational damage, and regulatory penalties related to data breaches.

Immediate Action: Apply the security updates provided by the vendor to all affected ColdFusion instances immediately. After patching, review web server access logs and file systems for any indicators of compromise, such as suspicious file uploads or unusual access patterns.

Proactive Monitoring: Implement enhanced monitoring on ColdFusion servers. This includes monitoring for the creation of executable file types (e.g., .cfm, .jsp, .cfc) in unexpected directories, scrutinizing web access logs for requests to non-standard files, and monitoring for unusual processes being spawned by the ColdFusion service.

Compensating Controls: If immediate patching is not feasible, implement the following controls to reduce risk:

• Utilize a Web Application Firewall (WAF) with rules specifically designed to inspect and block malicious file uploads.
• Strictly enforce file system permissions to prevent the ColdFusion service account from writing to web-accessible directories where it is not required.
• Perform outbound network traffic filtering to block potential command-and-control (C2) connections from the server.
• Isolate the ColdFusion server from other critical network segments.

Public Exploit Available: false

Given the critical CVSS score of 9.1 and the potential for complete system compromise, immediate remediation is strongly recommended. Organizations must prioritize applying the vendor-supplied patches to all affected ColdFusion servers. Although this vulnerability is not currently listed on the CISA KEV catalog, its high severity makes it a prime candidate for future inclusion. The requirement for a high-privileged attacker reduces the immediate attack surface, but this should not diminish the urgency of patching, as privilege escalation vulnerabilities or credential theft could provide an attacker with the necessary access.