CVE-2020-7640 in pixl-class
Summary
by MITRE
pixl-class prior to 1.0.3 allows execution of arbitrary commands. The members argument of the create function 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-2020-7640 affects the pixl-class library version prior to 1.0.3, presenting a critical command injection flaw that enables unauthorized arbitrary code execution. This security weakness resides within the create function's handling of the members argument, which lacks any input sanitization or validation mechanisms. The flaw fundamentally stems from improper handling of user-controllable data that flows directly into system execution contexts without adequate security controls.
The technical implementation of this vulnerability demonstrates a classic command injection pattern where user-provided input is concatenated or passed directly to system commands without proper sanitization. When the create function processes the members argument, it fails to validate or escape special characters that could alter the intended command execution flow. This design flaw creates an environment where malicious actors can inject harmful commands that will execute with the privileges of the affected application. The vulnerability operates at the application layer and can be exploited through various attack vectors that manipulate the members parameter during function invocation.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete control over the affected system's execution environment. An attacker who can influence the members argument can execute arbitrary commands on the target system, potentially leading to full system compromise, data exfiltration, or lateral movement within the network. The lack of input validation creates a persistent security risk that affects all versions prior to 1.0.3, making it particularly dangerous for organizations that have not updated their implementations. This vulnerability directly maps to CWE-77 and CWE-88 within the CWE taxonomy, representing command injection flaws that allow execution of arbitrary code through improper input handling.
Mitigation strategies for this vulnerability require immediate implementation of input sanitization and validation controls. Organizations should upgrade to pixl-class version 1.0.3 or later, which includes proper input validation mechanisms for the members argument. Additionally, implementing proper parameter validation, input escaping, and using secure coding practices such as prepared statements or parameterized queries can prevent similar vulnerabilities. The remediation approach should follow ATT&CK technique T1059.001 for command and script injection, ensuring that all user inputs are properly validated and sanitized before processing. Security teams should also consider implementing web application firewalls and runtime application self-protection mechanisms to detect and prevent exploitation attempts. Regular security assessments and code reviews focusing on input handling and command execution patterns will help identify and remediate similar vulnerabilities in other components of the application stack.