CVE-2017-12119 in JSON-RPC
Summary
by MITRE
An exploitable unhandled exception vulnerability exists in multiple APIs of CPP-Ethereum JSON-RPC. Specially crafted JSON requests can cause an unhandled exception resulting in denial of service. An attacker can send malicious JSON to trigger this vulnerability.
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Analysis
by VulDB Data Team • 02/02/2023
The vulnerability identified as CVE-2017-12119 represents a critical security flaw within the CPP-Ethereum JSON-RPC implementation that exposes systems to potential denial of service attacks through unhandled exception conditions. This issue manifests in multiple application programming interfaces within the Ethereum client software, specifically targeting the way the system processes malformed or specially crafted JSON requests. The vulnerability stems from inadequate input validation and error handling mechanisms that fail to properly process unexpected data formats or values, leading to abrupt system termination when encountering malformed JSON structures.
The technical exploitation of this vulnerability occurs when an attacker submits carefully constructed JSON payloads to the affected APIs, which trigger unhandled exceptions within the software execution flow. These exceptions typically arise from the software's inability to gracefully handle edge cases or malformed data structures that fall outside the expected parameter ranges or data types. When such malformed inputs are processed, the system experiences a crash or abrupt termination, effectively rendering the JSON-RPC service unavailable to legitimate users and creating a denial of service condition. The vulnerability is particularly dangerous because it can be triggered through simple network requests without requiring authentication or specialized privileges, making it accessible to any attacker with network access to the affected system.
From an operational perspective, this vulnerability poses significant risks to Ethereum node operators and blockchain infrastructure providers who rely on the CPP-Ethereum client for their network operations. The denial of service impact can disrupt critical network services, affect transaction processing capabilities, and potentially compromise the overall stability of Ethereum-based networks. The vulnerability's accessibility means that attackers can easily exploit it to disrupt services without requiring deep technical knowledge or privileged access. Organizations using this software may experience service interruptions, increased operational overhead from incident response activities, and potential reputational damage from service disruptions that affect their users and partners.
The underlying cause of this vulnerability aligns with CWE-400, which addresses "Uncontrolled Resource Consumption," and demonstrates poor exception handling practices that are commonly exploited in denial of service attacks. This weakness directly relates to the ATT&CK technique T1499.004, which covers "Eclipse Attack" and "Resource Exhaustion," where attackers can consume system resources through malformed inputs. The vulnerability represents a classic example of how insufficient input validation and error handling can create exploitable conditions in network services. Organizations should implement robust input validation mechanisms, proper exception handling procedures, and comprehensive logging to detect and prevent such attacks. Mitigation strategies include applying the vendor-provided patches, implementing rate limiting mechanisms, and deploying network monitoring solutions to detect anomalous JSON request patterns that may indicate exploitation attempts.
The broader implications of this vulnerability extend beyond immediate service disruption to highlight fundamental security weaknesses in blockchain infrastructure implementations. It demonstrates the importance of secure coding practices and proper error handling in mission-critical systems where service availability is paramount. The vulnerability also underscores the need for regular security assessments and timely patch management in distributed systems where multiple nodes may be exposed to similar attack vectors. Organizations should consider implementing additional security controls such as API gateways with enhanced validation, intrusion detection systems, and comprehensive incident response procedures to address the potential impact of such vulnerabilities.