CVE-2014-7202 in ZeroMQ
Summary
by MITRE
stream_engine.cpp in libzmq (aka ZeroMQ/C++)) 4.0.5 before 4.0.5 allows man-in-the-middle attackers to conduct downgrade attacks via a crafted connection request.
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Analysis
by VulDB Data Team • 03/30/2022
The vulnerability identified as CVE-2014-7202 affects the stream_engine.cpp component within libzmq version 4.0.5 and earlier, representing a significant security flaw in the ZeroMQ messaging library that enables man-in-the-middle attackers to execute downgrade attacks through malicious connection requests. This vulnerability resides in the core streaming engine responsible for establishing and managing network connections between ZeroMQ endpoints, making it a critical component for secure message passing in distributed systems. The flaw specifically impacts the authentication and encryption negotiation processes during connection establishment, creating opportunities for attackers to manipulate the security parameters and force connections to use weaker cryptographic methods than initially intended.
The technical implementation of this vulnerability stems from insufficient validation of security parameters during the connection handshake process within the stream_engine.cpp module. When a client attempts to establish a connection with a ZeroMQ server, the protocol negotiation phase allows for various security mechanisms including encryption and authentication. The flaw occurs because the system fails to properly validate or enforce the security requirements specified by the connecting parties, enabling an attacker positioned in the network path to intercept the connection request and modify the security parameters to downgrade the connection to a less secure configuration. This weakness aligns with CWE-310, which categorizes cryptographic issues related to improper implementation of security protocols, and specifically relates to the lack of proper security parameter validation during protocol negotiation phases.
The operational impact of this vulnerability extends beyond simple network security concerns as it fundamentally undermines the trust model of ZeroMQ applications that rely on secure communication channels. Attackers can exploit this weakness to force connections to use unencrypted communication or weaker encryption algorithms, potentially exposing sensitive data transmitted through ZeroMQ networks. In environments where ZeroMQ is used for financial transactions, healthcare data exchange, or other security-sensitive applications, this downgrade attack could lead to data breaches, unauthorized access to confidential information, and complete compromise of the application's security posture. The vulnerability affects both client and server components of ZeroMQ implementations, making it particularly dangerous as it can be exploited from either end of a communication channel.
Mitigation strategies for CVE-2014-7202 require immediate patching of affected libzmq installations to version 4.0.5 or later, which contains the necessary security fixes to properly validate connection security parameters. Organizations should also implement network monitoring to detect anomalous connection patterns that might indicate downgrade attacks, particularly focusing on unexpected changes in encryption protocols or authentication methods during connection establishment. The ZeroMQ project's security advisory recommends enabling explicit security requirements for all connections and implementing proper certificate validation mechanisms to prevent unauthorized modification of security parameters. Additionally, network segmentation and firewall rules should be configured to limit direct access to ZeroMQ endpoints, reducing the attack surface available for man-in-the-middle exploitation. This vulnerability demonstrates the importance of proper protocol negotiation validation and aligns with ATT&CK technique T1071.004 for application layer protocol manipulation, emphasizing the need for robust security parameter enforcement in distributed messaging systems.