CVE-2023-28170 in Theme Demo Import Plugin
Summary
by MITRE • 12/20/2023
Unrestricted Upload of File with Dangerous Type vulnerability in Themely Theme Demo Import.This issue affects Theme Demo Import: from n/a through 1.1.1.
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Analysis
by VulDB Data Team • 12/20/2023
The Unrestricted Upload of File with Dangerous Type vulnerability in the Themely Theme Demo Import plugin represents a critical security flaw that allows attackers to upload malicious files to vulnerable WordPress installations. This vulnerability specifically impacts versions of the Theme Demo Import plugin ranging from unspecified initial versions through 1.1.1, creating a persistent threat window where countless websites remain exposed to potential compromise. The issue stems from inadequate validation and sanitization of file uploads, enabling unauthorized individuals to bypass security controls that should prevent execution of dangerous file types.
The technical nature of this vulnerability aligns with CWE-434, which describes the weakness of allowing unrestricted file upload with dangerous types. Attackers can exploit this flaw by uploading malicious files such as php scripts, shell scripts, or other executable content that can be executed on the web server. The vulnerability essentially removes all restrictions on file type validation, permitting uploads of files that could contain malicious code designed to establish persistent access, exfiltrate data, or perform other harmful activities against the compromised system. This flaw operates at the intersection of insufficient input validation and inadequate output encoding, creating an attack surface where file extensions are not properly verified.
The operational impact of this vulnerability extends far beyond simple unauthorized file uploads, as it provides attackers with a potential foothold for more sophisticated attacks within WordPress environments. Once malicious files are successfully uploaded, threat actors can leverage them to execute arbitrary code on the target server, potentially leading to complete system compromise and data breaches. The vulnerability affects WordPress sites that rely on demo import functionality, which is commonly used during theme installation and testing phases, making it particularly dangerous as legitimate administrative activity often triggers the vulnerable code paths. This creates a scenario where security controls may be bypassed during routine administrative tasks, expanding the attack window significantly.
Organizations should implement immediate mitigation strategies to address this vulnerability, including updating to patched versions of the Theme Demo Import plugin whenever available and applying proper file upload restrictions at multiple layers of defense. The recommended approach involves implementing strict file type validation that rejects executable files and implements content-based checks alongside traditional extension filtering. Security measures should include restricting upload directories to prevent execution of uploaded content, implementing proper file permissions, and establishing network-level controls that monitor for suspicious file upload patterns. Additionally, organizations should conduct regular security assessments of their WordPress installations to identify similar vulnerabilities in other plugins and themes, as this type of flaw is common across many web applications where user input validation is insufficient.
This vulnerability demonstrates the critical importance of maintaining current security practices and regularly updating third-party components within web applications. The ATT&CK framework categorizes this type of vulnerability under T1190 - Exploit Public-Facing Application, highlighting how attackers can leverage such flaws to gain initial access to target systems. Organizations must prioritize defensive measures including network segmentation, regular security monitoring, and comprehensive vulnerability management programs to protect against similar threats that could exploit weak file upload validation mechanisms and other input sanitization failures.