CVE-2022-29347 in Web@archiv
Summary
by MITRE • 05/04/2022
An arbitrary file upload vulnerability in [email protected] 1.0 allows attackers to execute arbitrary commands via a crafted PHP file.
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Analysis
by VulDB Data Team • 05/07/2022
The vulnerability identified as CVE-2022-29347 represents a critical arbitrary file upload flaw within the [email protected] package, which directly enables remote code execution capabilities for malicious actors. This vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly restrict file type uploads, allowing attackers to bypass security controls and upload malicious PHP files to the target system. The flaw exists in the package's file handling logic where it does not adequately verify the file extension, content type, or file signature before permitting uploads, creating an exploitable entry point for unauthorized code execution.
From a technical perspective, the vulnerability manifests when an attacker crafts a malicious PHP file with a carefully constructed filename that can bypass the application's upload restrictions. The package's implementation likely accepts uploads without proper validation of file characteristics, enabling attackers to upload files with extensions such as .php, .phtml, or other executable formats that can be executed by the web server. This arbitrary file upload vulnerability maps to CWE-434, which specifically addresses the insecure upload of files with dangerous types that can be executed on the target system. The flaw essentially allows attackers to upload PHP shell scripts or web shells that can be executed through the web server, providing them with persistent access to the underlying system.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise and data exfiltration capabilities. Once an attacker successfully uploads a malicious PHP file, they can execute arbitrary commands on the target system with the privileges of the web server process, potentially leading to full system takeover. This vulnerability can be exploited across various attack vectors including web application penetration testing, automated scanning tools, or manual exploitation attempts. The attack surface is particularly concerning as it affects the [email protected] package which may be widely used in web applications, creating a significant risk for organizations that have not yet patched or mitigated this vulnerability.
Mitigation strategies for CVE-2022-29347 should prioritize immediate remediation through package updates and version upgrades that address the file upload validation issues. Organizations must implement comprehensive input validation controls that enforce strict file type checking, including content-based verification, MIME type validation, and filename sanitization. Security measures should include restricting file upload directories, implementing proper file permissions, and employing web application firewalls to detect and block suspicious upload attempts. The mitigation approach aligns with ATT&CK technique T1190, which focuses on exploiting vulnerabilities in web applications to gain initial access, making defensive measures crucial for preventing exploitation. Additionally, organizations should conduct regular security assessments to identify and remediate similar vulnerabilities in their software dependencies, as this flaw demonstrates the importance of proper file handling and validation in preventing remote code execution attacks.