CVE-2022-31570 in ceneo-web-scrapper
Summary
by MITRE • 07/11/2022
The adriankoczuruek/ceneo-web-scrapper repository through 2021-03-15 on GitHub allows absolute path traversal because the Flask send_file function is used unsafely.
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Analysis
by VulDB Data Team • 07/21/2022
The vulnerability identified as CVE-2022-31570 resides within the adriankoczuruek/ceneo-web-scrapper repository, a web scraping tool designed to collect product data from e-commerce platforms. This repository, as of March 15, 2021, contains a critical security flaw that stems from improper implementation of file handling within a Flask web application framework. The vulnerability specifically manifests when the application employs the Flask send_file function without adequate input validation or sanitization measures, creating a path traversal attack vector that can be exploited by malicious actors to access arbitrary files on the server.
The technical flaw occurs because the Flask send_file function, when used without proper parameter validation, accepts user-supplied input directly as part of the file path parameter. This allows attackers to manipulate the file path through specially crafted requests that include directory traversal sequences such as ../ or ..\.. This vulnerability maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The flaw represents a fundamental security misconfiguration where the application fails to implement proper input sanitization and access control mechanisms before processing file requests.
The operational impact of this vulnerability is significant as it provides attackers with the ability to access sensitive files that should remain protected within the application's directory structure. An attacker could potentially retrieve configuration files containing database credentials, application secrets, or other sensitive information that might lead to further compromise of the system. Additionally, the vulnerability could enable unauthorized access to source code files, potentially exposing implementation details that could be leveraged for additional attacks. The threat landscape for this vulnerability aligns with ATT&CK technique T1213.002, which covers data from information repositories, as attackers can extract valuable data through unauthorized file access.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms before any file operations are performed. The recommended approach involves using a whitelist-based system that only allows specific, pre-approved file paths or implementing proper path normalization techniques that prevent directory traversal sequences from being processed. Developers should avoid using user-supplied input directly in file path construction and instead employ secure coding practices such as validating file paths against a known safe set of directories. The Flask application should also implement proper access controls and authentication mechanisms to ensure that only authorized users can access file retrieval functionality. Additionally, implementing proper logging and monitoring of file access patterns can help detect and respond to potential exploitation attempts, while adhering to security best practices outlined in the OWASP Top Ten Project for preventing path traversal vulnerabilities in web applications.