CVE-2004-1631 in Work Flow Engine
Summary
by MITRE
Open WorkFlow Engine (OpenWFE) 1.4.x allows remote attackers to conduct port scans of remote hosts by specifying the target in an rmi:// Worklist URL, then using the response times to infer the results.
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Analysis
by VulDB Data Team • 07/08/2017
The Open WorkFlow Engine OpenWFE version 1.4.x contains a significant security vulnerability that enables remote attackers to perform port scanning operations against arbitrary hosts through the manipulation of Worklist URLs. This vulnerability specifically leverages the rmi:// protocol specification within Worklist URLs to establish connections with remote systems. The flaw exists in how the system processes and handles remote method invocation requests, creating an indirect channel for reconnaissance activities that can be exploited without direct authentication or authorization.
The technical implementation of this vulnerability stems from the engine's insufficient validation and handling of remote URLs within the Worklist processing framework. When an rmi:// URL is specified in a Worklist, the OpenWFE engine attempts to establish a connection to the remote host to verify the resource's availability. Attackers can craft malicious Worklist entries that point to target systems and observe the response timing characteristics to determine which ports are open or closed on the target network. This timing-based inference technique allows for passive port scanning without the need for active network probes that would typically trigger intrusion detection systems.
The operational impact of this vulnerability extends beyond simple reconnaissance as it provides attackers with valuable information about network topology and service availability. The ability to perform port scans using this method can reveal the presence of additional services, operating system fingerprints, and potential attack vectors that might not be visible through traditional scanning methods. This vulnerability essentially transforms the workflow engine into an unwitting reconnaissance tool that can be leveraged to map network infrastructure and identify potential targets for further exploitation. The timing-based nature of the attack also makes it difficult to detect through conventional network monitoring approaches since the traffic appears legitimate within the context of normal workflow operations.
This vulnerability aligns with CWE-693 Protection Mechanism Failure, as the system fails to properly implement security controls that would prevent unauthorized access to network resources through legitimate workflow processing mechanisms. The flaw also maps to several ATT&CK techniques including T1046 Network Service Scanning and T1049 System Network Connections Discovery, as it enables attackers to discover network services and connections without direct system access. The vulnerability represents a classic example of how legitimate system features can be abused to create security weaknesses, particularly in distributed computing environments where remote method invocation protocols are commonly used for system integration. Organizations using OpenWFE 1.4.x should immediately implement network-level restrictions on outbound rmi:// connections and consider disabling remote URL processing capabilities until a proper security patch is applied. Additionally, monitoring for unusual patterns in workflow processing that involve remote URL resolution can help detect exploitation attempts and provide early warning of potential reconnaissance activities.