CVE-2018-9208 in jQuery Picture Cut
Summary
by MITRE
Unauthenticated arbitrary file upload vulnerability in jQuery Picture Cut <= v1.1Beta
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Analysis
by VulDB Data Team • 04/10/2020
The CVE-2018-9208 vulnerability represents a critical security flaw in the jQuery Picture Cut plugin version 1.1Beta, which allows unauthenticated attackers to upload arbitrary files to vulnerable web servers. This vulnerability stems from insufficient input validation and access control mechanisms within the plugin's file upload functionality, creating a pathway for malicious actors to bypass authentication requirements and execute unauthorized file operations on affected systems. The flaw specifically impacts web applications that utilize this particular version of the jQuery Picture Cut plugin, which is commonly employed for image manipulation and cropping features in content management systems and web applications.
The technical implementation of this vulnerability resides in the plugin's handling of file upload requests where proper validation checks are either missing or inadequately implemented. Attackers can exploit this weakness by crafting malicious HTTP requests that bypass authentication mechanisms and directly target the file upload endpoint. The vulnerability enables the upload of executable files, script files, or other malicious content that can be executed on the target server, potentially leading to complete system compromise. This type of vulnerability falls under the CWE-434 category, which specifically addresses "Unrestricted Upload of File with Dangerous Type," representing a well-documented pattern of insecure file handling practices that have been consistently exploited in various web application attacks.
The operational impact of this vulnerability extends beyond simple file uploads, as it creates a persistent threat vector that can be leveraged for further attack phases within the kill chain. Once an attacker successfully uploads malicious content, they can execute code remotely, potentially establishing persistent backdoors, escalating privileges, or using the compromised server as a launchpad for attacking other systems within the network. This vulnerability aligns with several ATT&CK techniques including T1190 for Exploit Public-Facing Application and T1059 for Command and Scripting Interpreter, as it enables attackers to execute arbitrary commands through uploaded malicious files. The unauthenticated nature of the exploit means that no valid credentials are required to exploit the vulnerability, significantly increasing the attack surface and reducing the barrier to successful exploitation.
Organizations utilizing affected versions of the jQuery Picture Cut plugin should immediately implement mitigations including updating to patched versions, implementing strict file type validation, restricting upload directories, and applying proper access controls. The vulnerability demonstrates the critical importance of validating file uploads at multiple layers including client-side, server-side, and network-level controls. Security measures should include implementing Content Security Policies, restricting file extensions, performing MIME type validation, and ensuring that uploaded files are stored in non-executable directories. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other plugins and web applications. The incident highlights the necessity of maintaining up-to-date software libraries and implementing comprehensive security controls around file handling operations to prevent similar exploitation scenarios.