CVE-2018-19166 in peercoin
Summary
by MITRE
peercoin through 0.6.4 (a chain-based proof-of-stake cryptocurrency) allows a remote denial of service, exploitable by an attacker who acquires even a small amount of stake/coins in the system. The attacker sends invalid headers/blocks, which are stored on the victim's disk.
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Analysis
by VulDB Data Team • 02/04/2024
The vulnerability identified as CVE-2018-19166 affects peercoin version 0.6.4 and earlier, representing a critical denial of service weakness within a chain-based proof-of-stake cryptocurrency system. This flaw demonstrates how even minimal stake ownership can enable attackers to disrupt network operations, creating a significant security concern for cryptocurrency protocols that rely on stake-based consensus mechanisms. The vulnerability operates through a sophisticated attack vector that exploits the inherent trust model of blockchain networks.
The technical flaw stems from insufficient validation of headers and blocks within the peercoin protocol, allowing malicious actors to submit invalid transaction data that gets permanently stored on victim nodes' disks. This represents a classic case of inadequate input sanitization and validation controls, where the system fails to properly verify the legitimacy of incoming blockchain data before committing it to local storage. The attack mechanism specifically targets the block validation process, exploiting a gap in the protocol's integrity checking mechanisms that permits malformed data to persist within the node's database.
The operational impact of this vulnerability extends beyond simple service disruption, creating a persistent resource consumption problem that can gradually degrade node performance and potentially lead to complete system failure. Attackers with minimal stake ownership can systematically fill victim nodes with invalid data, consuming disk space and processing power while maintaining the ability to continue the attack indefinitely. This creates a scenario where legitimate network participants face increasing operational costs and reduced system reliability, undermining the fundamental principles of distributed consensus and network robustness that cryptocurrency systems depend upon.
The vulnerability aligns with CWE-20, which addresses "Improper Input Validation," and demonstrates how insufficient validation controls can lead to resource exhaustion and denial of service conditions. From an ATT&CK framework perspective, this represents a technique that leverages the network's trust model to execute resource exhaustion attacks through the manipulation of legitimate network protocols. The attack requires minimal resources to execute but can cause significant damage to network infrastructure, making it particularly dangerous for cryptocurrency networks that rely on distributed node participation for security and functionality.
Mitigation strategies should focus on implementing robust input validation mechanisms that filter out invalid headers and blocks before storage, along with enhanced monitoring systems that detect unusual disk usage patterns and data storage anomalies. Network operators should consider implementing rate limiting and transaction filtering controls that prevent the propagation of malformed data throughout the network. Additionally, protocol-level improvements should address the root cause by requiring more stringent validation checks and implementing automated cleanup mechanisms for invalid data to prevent long-term storage issues while maintaining the integrity and availability of legitimate blockchain data.