CVE-2020-8298 in fs-path
Summary
by MITRE • 03/05/2021
fs-path node module before 0.0.25 is vulnerable to command injection by way of user-supplied inputs via the `copy`, `copySync`, `remove`, and `removeSync` methods.
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Analysis
by VulDB Data Team • 03/28/2021
The fs-path node module vulnerability identified as CVE-2020-8298 represents a critical command injection flaw that affects versions prior to 0.0.25. This vulnerability stems from insufficient input validation within the module's file system operations, specifically impacting the copy, copySync, remove, and removeSync methods. The flaw allows malicious actors to inject arbitrary commands through user-supplied inputs, potentially compromising the underlying system. The vulnerability manifests when the module processes file system operations that involve user-provided paths or filenames, creating an attack surface where untrusted input can be interpreted as executable commands rather than simple file system references.
The technical implementation of this vulnerability aligns with CWE-78, which specifically addresses OS command injection flaws in software systems. When user-supplied data is directly incorporated into system commands without proper sanitization or validation, attackers can manipulate the execution flow of the application. The fs-path module's methods fail to properly escape or validate special characters that have meaning in shell contexts, such as semicolons, pipes, or command substitution operators. This allows attackers to craft malicious input that gets executed as shell commands, potentially leading to complete system compromise. The vulnerability exists because the module does not implement proper input sanitization techniques that would prevent the interpretation of user input as command syntax rather than literal file path references.
Operationally, this vulnerability poses significant risks to applications that rely on the fs-path module for file system operations. Attackers could exploit this weakness to execute arbitrary commands with the privileges of the application process, potentially leading to data exfiltration, system compromise, or denial of service conditions. The impact extends beyond simple command execution as the vulnerability affects core file system operations that are fundamental to many applications, making it particularly dangerous in environments where the module is used extensively. Systems running vulnerable versions may experience unauthorized access, privilege escalation, or complete system takeover depending on the execution context and available permissions. The vulnerability is especially concerning in web applications or services that accept user input for file operations, as these represent common attack vectors for command injection exploits.
Mitigation strategies for CVE-2020-8298 primarily involve upgrading to version 0.0.25 or later of the fs-path module, which includes proper input validation and sanitization measures. Organizations should conduct comprehensive inventory checks to identify all systems using vulnerable versions and implement immediate patching procedures. Additional defensive measures include implementing proper input validation at multiple layers, using parameterized file operations instead of shell command execution, and employing principle of least privilege configurations to limit the impact of potential exploitation. Security monitoring should be enhanced to detect unusual file system activity patterns that might indicate exploitation attempts. The vulnerability also highlights the importance of following secure coding practices as outlined in the OWASP Top Ten and MITRE ATT&CK framework, particularly in preventing command injection attacks through proper input validation and secure coding methodologies. Regular security assessments and dependency management practices should be implemented to prevent similar vulnerabilities from emerging in other components of the software supply chain.