Flowise 3.1.3 Arbitrary Code Execution Exploit Published

A critical arbitrary code execution (ACE) vulnerability has been publicly disclosed and an exploit published on Exploit-DB (EDB-52623) targeting Flowise version 3.1.3 and earlier. Flowise is an open-source low-code platform for building custom LLM (Large Language Model) orchestration flows. The availability of a working exploit means that unpatched Flowise instances exposed to the internet are at severe risk of compromise, allowing unauthorized attackers to execute arbitrary commands on the underlying server. This significantly elevates the threat level for organizations utilizing Flowise, as successful exploitation can lead to full system control, data exfiltration, and further network lateral movement, making immediate patching imperative for all affected systems.

Attack Chain

1. Initial Access: Attacker identifies an internet-exposed instance of Flowise version 3.1.3 or earlier using reconnaissance techniques like Shodan or similar scanning tools.
2. Exploitation: The attacker crafts and sends a malicious request exploiting the arbitrary code execution vulnerability (EDB-52623) within the Flowise web application.
3. Command Execution: The vulnerable Flowise application processes the attacker's request, which includes embedded commands or code, resulting in their execution on the underlying server with the privileges of the web server process.
4. Shell Access: The attacker gains initial shell access or command execution capability on the compromised server, often by leveraging commonly available system utilities or reverse shell techniques.
5. Establish Persistence: The attacker may then establish persistence mechanisms, such as creating new user accounts, modifying system services, deploying web shells, or scheduling tasks to maintain access.
6. Lateral Movement and Data Exfiltration: With persistent access, the attacker proceeds with internal network reconnaissance, lateral movement to other systems, and exfiltration of sensitive data from the compromised environment.
7. Impact Fulfillment: The ultimate objective is typically data theft, deployment of ransomware, or using the compromised server as a pivot point for further attacks against the organization or its partners.

Impact

The impact of this arbitrary code execution vulnerability is severe, potentially leading to full system compromise of the server hosting Flowise. Successful exploitation can grant attackers complete control over the affected system, enabling them to steal sensitive data, deploy malware (e.g., ransomware, cryptominers), pivot to other systems within the network, or disrupt business operations. Organizations across all sectors using Flowise 3.1.3 or earlier, particularly those exposing instances to the public internet, are at risk. Data breaches, operational downtime, and reputational damage are direct consequences of unpatched systems.

Recommendation

• Immediately patch all Flowise instances to a version higher than 3.1.3 to remediate the arbitrary code execution vulnerability (EDB-52623).
• Monitor webserver logs for suspicious requests targeting Flowise endpoints, specifically looking for anomalous parameters or command injection attempts related to the arbitrary code execution vulnerability.
• Implement robust network segmentation for Flowise deployments, isolating them from critical internal systems and sensitive data stores.