CVE-2022-1811 in publify
Summary
by MITRE • 05/23/2022
Unrestricted Upload of File with Dangerous Type in GitHub repository publify/publify prior to 9.2.9.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 05/29/2022
The vulnerability identified as CVE-2022-1811 represents a critical security flaw in the publify blogging platform where the application fails to properly validate file uploads, allowing attackers to upload malicious files with dangerous extensions. This issue affects versions prior to 9.2.9 and stems from insufficient input validation mechanisms within the file upload functionality. The vulnerability creates a pathway for remote code execution and arbitrary file manipulation through the unrestricted acceptance of potentially harmful file types.
The technical root cause of this vulnerability aligns with CWE-434 which describes the weakness of unrestricted upload of file with dangerous type. The flaw occurs when the application does not adequately verify file extensions, MIME types, or file contents before accepting uploads. Attackers can exploit this by uploading files with extensions such as .php, .jsp, .asp, or other server-side script formats that can be executed by the web server. The vulnerability essentially bypasses the intended security controls that should prevent the upload of executable code or potentially harmful files.
The operational impact of CVE-2022-1811 is severe and multifaceted, encompassing potential complete system compromise, data exfiltration, and service disruption. An attacker who successfully exploits this vulnerability can gain unauthorized access to the server, execute arbitrary commands, and potentially establish persistent backdoors. This vulnerability directly maps to several techniques in the MITRE ATT&CK framework, particularly those related to initial access through web application attacks and privilege escalation via command execution. The vulnerability can be exploited through various attack vectors including phishing, social engineering, or direct exploitation of the vulnerable web application interface.
Organizations using publify versions prior to 9.2.9 should immediately implement multiple layers of defense to mitigate this risk. The primary mitigation involves upgrading to version 9.2.9 or later, which includes proper file type validation and sanitization mechanisms. Additional protective measures include implementing strict file extension filtering, validating file contents against known malicious patterns, and restricting file upload capabilities to authenticated users only. Network-based solutions such as web application firewalls can provide additional protection by monitoring for suspicious upload patterns. Regular security audits and penetration testing should be conducted to ensure proper implementation of file upload validation controls. The vulnerability also highlights the importance of following secure coding practices and implementing proper input validation as recommended in OWASP Top Ten and NIST cybersecurity guidelines.