CVE-2020-7609 in node-rules
Summary
by MITRE
node-rules including 3.0.0 and prior to 5.0.0 allows injection of arbitrary commands. The argument rules of function "fromJSON()" can be controlled by users without any sanitization.
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Analysis
by VulDB Data Team • 06/03/2024
The vulnerability identified as CVE-2020-7609 affects the node-rules library version 3.0.0 through 4.9.9, presenting a critical command injection flaw that enables remote attackers to execute arbitrary code on affected systems. This vulnerability resides within the fromJSON() function where user-controllable input is directly processed without proper sanitization or validation, creating a dangerous attack surface that can be exploited by malicious actors to gain unauthorized system access.
The technical implementation of this vulnerability stems from insufficient input validation within the library's rule processing mechanism. When the fromJSON() function processes user-provided JSON data containing rule definitions, it fails to properly sanitize or escape special characters that could be interpreted as shell commands. This lack of input sanitization creates a direct path for command injection attacks where attackers can manipulate the rules parameter to execute arbitrary system commands with the privileges of the affected application. The vulnerability maps directly to CWE-78, which specifically addresses improper neutralization of special elements used in OS commands, making it a classic command injection flaw that has been extensively documented in cybersecurity literature.
The operational impact of this vulnerability extends beyond simple code execution, as it can lead to complete system compromise when exploited by attackers. An attacker who successfully exploits this vulnerability can perform actions such as reading sensitive files, executing arbitrary commands, establishing persistent backdoors, or even escalating privileges to gain root access on the affected system. The severity is amplified by the fact that the vulnerability affects a widely used rule engine library, meaning that any application or service utilizing node-rules in its rule processing functionality becomes a potential target for exploitation. This creates a significant risk for organizations that depend on rule-based systems for business logic processing, as the attack surface is not limited to a single application but can affect entire infrastructure components that rely on this library.
Organizations should immediately implement mitigations including upgrading to node-rules version 5.0.0 or later, which contains the necessary patches to address the input sanitization issues. Additionally, implementing proper input validation at application level, using parameterized queries, and employing defensive programming practices can help reduce the risk of exploitation. Network segmentation and monitoring for unusual command execution patterns can provide additional layers of defense. The vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter, making it particularly dangerous in environments where attackers can leverage such capabilities to establish persistent access and conduct further reconnaissance or lateral movement activities. Regular security assessments and vulnerability scanning should be conducted to identify any other potentially affected systems that may be utilizing vulnerable versions of this library.