CVE-2020-36199 in TinyCheck
Summary
by MITRE • 01/26/2021
TinyCheck before commits 9fd360d and ea53de8 was vulnerable to command injection due to insufficient checks of input parameters in several places.
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Analysis
by VulDB Data Team • 02/19/2021
The vulnerability identified as CVE-2020-36199 affects TinyCheck versions prior to commits 9fd360d and ea53de8, presenting a critical command injection flaw that stems from inadequate input validation mechanisms. This security weakness manifests in multiple locations within the application where user-supplied parameters are not properly sanitized before being incorporated into system commands. The flaw represents a fundamental failure in input validation practices that directly violates established security principles and industry standards such as CWE-77 which specifically addresses command injection vulnerabilities.
TinyCheck is designed as a network monitoring and analysis tool that processes various input parameters from users to perform network packet capture and analysis functions. The command injection vulnerability occurs when the application accepts user input and directly incorporates it into shell commands without proper sanitization or escaping mechanisms. Attackers can exploit this weakness by crafting malicious input that gets executed as system commands, potentially allowing arbitrary code execution on the affected system. This type of vulnerability falls under the ATT&CK technique T1059.001 which encompasses command and scripting interpreter execution, making it particularly dangerous in network monitoring contexts where elevated privileges may be required.
The operational impact of this vulnerability extends beyond simple command execution, as it can potentially allow attackers to gain full control over the affected system. When user input flows directly into system commands without proper validation, attackers can manipulate the execution flow to perform unauthorized actions such as file manipulation, process termination, or even privilege escalation. The vulnerability's presence in multiple locations within the codebase suggests a systemic issue with input handling practices, indicating that the application may be susceptible to similar flaws throughout its architecture. This widespread nature of the vulnerability makes it particularly concerning as it likely affects core functionality rather than isolated components.
Mitigation strategies for CVE-2020-36199 must focus on implementing comprehensive input validation and sanitization measures across all user-facing interfaces. The most effective approach involves adopting parameterized command execution where user input is properly escaped or encoded before being incorporated into system calls. Organizations should implement proper input filtering mechanisms that validate data types, lengths, and formats while ensuring that special characters commonly used in command injection attacks are appropriately handled. The fix should include updating to versions that incorporate commits 9fd360d and ea53de8 which contain the necessary patches to address the input validation gaps. Additionally, implementing proper access controls and privilege separation can limit the potential damage from successful exploitation attempts, though the primary defense remains robust input validation as specified in CWE-174 and aligned with ATT&CK framework recommendations for preventing command injection attacks.