CVE-2018-15890 in EthereumJ
Summary
by MITRE
An issue was discovered in EthereumJ 1.8.2. There is Unsafe Deserialization in ois.readObject in mine/Ethash.java and decoder.readObject in crypto/ECKey.java. When a node syncs and mines a new block, arbitrary OS commands can be run on the server.
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Analysis
by VulDB Data Team • 10/07/2023
The vulnerability CVE-2018-15890 represents a critical unsafe deserialization flaw within EthereumJ version 1.8.2 that fundamentally compromises the security of Ethereum nodes operating with this software. This issue stems from improper handling of serialized data structures during the node synchronization and mining processes, creating a pathway for remote code execution attacks. The vulnerability specifically affects two key components within the EthereumJ codebase where deserialization occurs without adequate validation or sanitization of incoming data.
The technical implementation of this vulnerability manifests in two primary locations within the EthereumJ framework. The first occurs in the ois.readObject method within the mine/Ethash.java file, while the second vulnerability exists in the decoder.readObject method located in crypto/ECKey.java. Both of these methods are invoked during critical node operations including block synchronization and mining activities. When an Ethereum node processes incoming data from the network during these operations, the deserialization process fails to validate the integrity and source of the serialized objects, allowing malicious actors to craft specially crafted serialized data that executes arbitrary operating system commands on the affected server. This represents a classic unsafe deserialization vulnerability that enables remote code execution through carefully constructed malicious input.
The operational impact of CVE-2018-15890 extends far beyond simple data corruption or denial of service conditions. An attacker who successfully exploits this vulnerability can gain complete control over the compromised Ethereum node, potentially using it as a pivot point for further attacks within the network infrastructure. The vulnerability is particularly dangerous because it can be triggered during normal node operations when synchronizing with the network or mining new blocks, meaning that any node running EthereumJ 1.8.2 is at risk. This attack vector aligns with ATT&CK technique T1059.007 for command and script interpreter execution, as the malicious payload executes operating system commands directly on the target system. The vulnerability also maps to CWE-502 which specifically addresses unsafe deserialization, where the software deserializes untrusted data without proper validation, leading to arbitrary code execution.
Security practitioners should recognize this vulnerability as a critical threat requiring immediate remediation. The recommended mitigation strategy involves upgrading to a patched version of EthereumJ that implements proper input validation and sanitization for all deserialization operations. Additionally, network segmentation and monitoring should be implemented to detect anomalous deserialization activities that might indicate exploitation attempts. Organizations should also consider implementing application whitelisting policies and restricting network access to Ethereum nodes to minimize the attack surface. The vulnerability demonstrates the importance of secure coding practices in cryptocurrency implementations and highlights the need for thorough security testing of serialization mechanisms in distributed ledger systems. This issue serves as a stark reminder that the security of blockchain infrastructure depends heavily on proper input validation and the prevention of unsafe deserialization patterns that can lead to complete system compromise.