CVE-2022-4606 in flatpress
Summary
by MITRE • 12/18/2022
PHP Remote File Inclusion in GitHub repository flatpressblog/flatpress prior to 1.3.
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Analysis
by VulDB Data Team • 01/15/2023
The vulnerability CVE-2022-4606 represents a critical remote file inclusion flaw in the FlatPress blogging platform, specifically affecting versions prior to 1.3. This issue resides within the application's handling of user-supplied input that is subsequently processed through include or require statements. The vulnerability stems from inadequate input validation and sanitization mechanisms that allow malicious actors to inject arbitrary file paths into the application's execution flow. The affected repository flatpressblog/flatpress demonstrates a classic security oversight where dynamic file inclusion operations do not properly validate or escape user-provided parameters before being used in file system operations. This flaw creates an attack surface where remote adversaries can manipulate the application's behavior by injecting malicious file paths, potentially leading to arbitrary code execution or unauthorized access to system resources.
The technical exploitation of this vulnerability occurs when the application accepts user input through parameters that are directly incorporated into file inclusion directives without proper sanitization. Attackers can leverage this weakness by crafting malicious URLs or input payloads that specify arbitrary file paths or URLs to be included by the vulnerable application. When the application processes these inputs through functions such as include(), require(), or similar file inclusion mechanisms, it executes the attacker-controlled content. This pattern aligns with CWE-98, which describes improper file inclusion vulnerabilities where applications include files based on user-supplied input without proper validation. The vulnerability can be exploited through various attack vectors including web application interfaces, API endpoints, or any user-controllable parameter that eventually gets processed through file inclusion operations, making it particularly dangerous in web environments where user input is common.
The operational impact of CVE-2022-4606 extends beyond simple data theft or service disruption, as it can enable complete system compromise when exploited successfully. Remote attackers who successfully exploit this vulnerability can achieve arbitrary code execution on the target system, potentially leading to full system takeover, data exfiltration, or the establishment of persistent backdoors. The vulnerability affects not only the immediate application functionality but also the underlying server infrastructure, as the included files may have elevated privileges or access to sensitive system resources. Organizations running vulnerable versions of FlatPress face significant risk of unauthorized access, data breaches, and potential lateral movement within their network environments. The impact is particularly severe in shared hosting environments or multi-tenant systems where a compromised FlatPress installation could affect other hosted applications or users. This vulnerability also enables attackers to perform reconnaissance activities, escalate privileges, and potentially establish command and control channels, making it a critical concern for security operations teams and system administrators.
Mitigation strategies for CVE-2022-4606 should focus on immediate remediation through software updates to version 1.3 or later, which contains the necessary patches to address the file inclusion vulnerability. Organizations should implement proper input validation and sanitization measures, ensuring that all user-supplied parameters are rigorously checked before being used in file inclusion operations. The implementation of a whitelist-based approach for file inclusion, where only pre-approved file paths or names are accepted, provides an additional layer of protection against malicious input. Security configurations should include disabling remote file inclusion capabilities in PHP settings and implementing proper access controls and permissions for application files. Regular security audits and code reviews should be conducted to identify similar patterns that might exist in other parts of the application or related systems. Additionally, network monitoring and intrusion detection systems should be configured to detect suspicious file inclusion patterns or attempts to access unauthorized files through web application interfaces. Organizations should also consider implementing web application firewalls and security headers to further protect against exploitation attempts. The vulnerability highlights the importance of following secure coding practices and adhering to security standards such as those outlined in the OWASP Top Ten and NIST cybersecurity guidelines to prevent similar issues in future development cycles.