CVE-2018-16733 in Go Ethereum
Summary
by MITRE
In Go Ethereum (aka geth) before 1.8.14, TraceChain in eth/api_tracer.go does not verify that the end block is after the start block.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 05/07/2023
The vulnerability identified as CVE-2018-16733 affects the Go Ethereum client software commonly known as geth version 1.8.14 and earlier. This security flaw resides within the eth/api_tracer.go component of the software, specifically within the TraceChain functionality that enables blockchain tracing operations. The issue stems from insufficient input validation mechanisms that fail to properly verify the logical relationship between start and end block parameters during chain tracing operations. This oversight creates a potential security risk that could be exploited by malicious actors to manipulate blockchain analysis operations.
The technical flaw manifests in the absence of proper validation logic that would ensure the end block number is greater than the start block number when executing TraceChain operations. This validation gap allows attackers to submit malformed parameters where the end block precedes the start block, potentially causing unexpected behavior in the tracing mechanism. The vulnerability represents a classic case of inadequate input validation that can lead to operational instability and potentially enable further exploitation vectors. According to CWE classification, this corresponds to CWE-129: Improper Validation of Array Index, as the system fails to validate the logical ordering of block indices used in chain tracing operations.
The operational impact of this vulnerability extends beyond simple functional disruption to encompass potential security implications for blockchain analysis and monitoring activities. When an attacker provides an end block that occurs before the start block, the tracing functionality may exhibit undefined behavior, potentially leading to crashes, incorrect results, or information disclosure. This flaw could be particularly problematic in environments where automated monitoring systems rely on TraceChain functionality for blockchain analysis, as it could result in system instability or incorrect diagnostic information. The vulnerability affects the integrity of blockchain tracing operations and could potentially be leveraged to disrupt services or gain unauthorized insights into blockchain data processing.
Mitigation strategies for CVE-2018-16733 involve upgrading to geth version 1.8.14 or later, which includes the necessary validation checks to prevent invalid block range parameters from being processed. Organizations should also implement proper input validation controls at the application level and consider additional monitoring for anomalous parameter usage patterns in blockchain tracing operations. The fix implemented in the patched version enforces proper validation of block number relationships, ensuring that end block numbers must be greater than or equal to start block numbers before processing can proceed. Security practitioners should also consider implementing network-level controls to detect and prevent unusual parameter combinations that might indicate attempted exploitation of this vulnerability. This remediation aligns with the principle of least privilege and defense in depth strategies recommended in cybersecurity frameworks, ensuring that all inputs are properly validated before processing within critical system components.