CVE-2020-7882 in anySign4PC
Summary
by MITRE • 11/22/2021
Using the parameter of getPFXFolderList function, attackers can see the information of authorization certification and delete the files. It occurs because the parameter contains path traversal characters(ie. '../../../')
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Analysis
by VulDB Data Team • 11/25/2021
The vulnerability identified as CVE-2020-7882 represents a critical path traversal flaw within a system's getPFXFolderList function that enables unauthorized access to sensitive certification data and file deletion capabilities. This vulnerability arises from insufficient input validation and sanitization of user-supplied parameters, allowing attackers to manipulate file paths through maliciously constructed input strings containing traversal sequences such as '../../../'. The affected system processes these parameters without proper authorization checks or path validation, creating an avenue for attackers to navigate beyond intended directories and access protected certificate files that contain sensitive authorization information.
The technical implementation of this vulnerability stems from the function's failure to properly sanitize input parameters before using them in file system operations. When an attacker supplies a parameter containing path traversal sequences, the system processes these characters directly without validation, allowing the attacker to move up directory levels and access files outside the intended scope. This flaw directly maps to CWE-22 Path Traversal vulnerability classification, which occurs when untrusted input is used to construct file paths without proper validation, enabling attackers to access files outside the intended directory structure. The vulnerability can be exploited through various attack vectors including web applications, command-line interfaces, or any system component that accepts user input for file operations.
The operational impact of this vulnerability extends beyond simple information disclosure to include potential data destruction and system compromise. Attackers can not only view sensitive certification files containing authorization credentials but also delete critical system files, potentially leading to service disruption or complete system compromise. The exposure of authorization certification information creates opportunities for privilege escalation attacks where attackers can impersonate legitimate users or systems. This vulnerability aligns with ATT&CK technique T1078 Valid Accounts, as it enables attackers to leverage legitimate authorization information to gain unauthorized access to protected resources. The ability to delete files introduces additional risk for denial of service attacks and data integrity compromise.
Mitigation strategies for CVE-2020-7882 should focus on implementing robust input validation and sanitization mechanisms that prevent path traversal sequences from being processed. The most effective approach involves implementing strict parameter validation that filters out or removes traversal characters from user input before any file system operations are performed. System administrators should also implement proper access controls and authorization checks to ensure that only authorized users can access sensitive certification files. Additionally, implementing a whitelist approach for file operations, where only predetermined safe paths are allowed, can prevent unauthorized directory traversal. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other system components. The remediation process should include updating the getPFXFolderList function to properly sanitize input parameters and implement proper path validation mechanisms that align with industry best practices for secure file system operations. Organizations should also consider implementing automated security scanning tools that can detect similar path traversal vulnerabilities in their codebase.