CVE-2016-8598 in libcsp
Summary
by MITRE
Buffer overflow in the zmq interface in csp_if_zmqhub.c in the libcsp library v1.4 and earlier allows hostile computers connected via a zmq interface to execute arbitrary code via a long packet.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/14/2025
The vulnerability identified as CVE-2016-8598 represents a critical buffer overflow flaw within the libcsp library version 1.4 and earlier, specifically affecting the zmq (ZeroMQ) interface implementation. This issue resides in the csp_if_zmqhub.c source file, where improper input validation and boundary checking mechanisms fail to adequately handle packet data exceeding predetermined buffer limits. The libcsp library serves as a communication stack for space applications and embedded systems, facilitating network communication between various nodes in space missions and ground stations. The zmq interface specifically enables communication over the ZeroMQ messaging library, which is widely used for high-performance asynchronous messaging in distributed applications.
The technical exploitation of this vulnerability occurs when a remote attacker sends a maliciously crafted packet through the zmq interface that exceeds the allocated buffer space. This overflow condition allows an attacker to overwrite adjacent memory locations, potentially corrupting program execution flow and enabling arbitrary code execution on the target system. The flaw stems from insufficient bounds checking during packet processing, where packet data is directly copied into fixed-size buffers without proper validation of the incoming data length. This type of vulnerability maps directly to CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of unsafe memory handling practices in networked applications. The attack vector requires network connectivity through the zmq interface, making it particularly concerning for distributed systems where network boundaries may be poorly secured.
The operational impact of this vulnerability extends beyond simple code execution, as it fundamentally compromises the integrity and availability of systems relying on libcsp for communication. In space applications and embedded systems environments, where reliability and security are paramount, such a flaw could lead to mission-critical failures or unauthorized access to sensitive operational data. The vulnerability affects systems that depend on the ZeroMQ messaging protocol for inter-node communication, potentially enabling attackers to gain control over networked devices, manipulate communication flows, or cause system crashes. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and control through remote access capabilities, and T1210 for exploitation of remote services. The impact is particularly severe in environments where multiple nodes communicate through the same zmq hub, as a single compromised node could potentially affect the entire communication network.
Mitigation strategies for CVE-2016-8598 require immediate patching of the libcsp library to version 1.5 or later, which includes proper buffer size validation and input sanitization mechanisms. Organizations should implement network segmentation and access controls to limit exposure of zmq interfaces to untrusted networks, while also deploying intrusion detection systems to monitor for suspicious packet patterns. Input validation should be strengthened at multiple layers, including application-level checks and network-level filtering to prevent oversized packets from reaching vulnerable components. The fix addresses the root cause by implementing proper bounds checking and using safe memory manipulation functions that prevent buffer overflows. Additionally, system administrators should conduct thorough vulnerability assessments of all systems using affected libcsp versions, while implementing monitoring protocols to detect potential exploitation attempts. The vulnerability highlights the importance of secure coding practices in embedded systems and emphasizes the need for regular security updates in mission-critical applications.