CVE-2020-36070 in Yoyager
Summary
by MITRE • 04/26/2023
Insecure Permission vulnerability found in Yoyager v.1.4 and before allows a remote attacker to execute arbitrary code via a crafted .php file to the media component.
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Analysis
by VulDB Data Team • 07/06/2025
The vulnerability identified as CVE-2020-36070 represents a critical insecure permission flaw within the Yoyager application version 1.4 and earlier releases. This vulnerability resides within the media component of the software, creating a pathway for remote attackers to gain unauthorized execution privileges. The flaw stems from inadequate access controls and improper file handling mechanisms that allow malicious actors to upload and execute arbitrary code through specially crafted php files.
The technical implementation of this vulnerability involves the media component's failure to properly validate file uploads and enforce appropriate permission controls. When a remote attacker successfully uploads a malicious php file to the media component, the system does not adequately verify the file type or execution permissions, thereby allowing the uploaded payload to be executed within the application's runtime environment. This represents a classic path to remote code execution through insecure file upload mechanisms, which aligns with CWE-434, specifically addressing insecure file upload vulnerabilities where applications accept files without proper validation and security checks.
From an operational impact perspective, this vulnerability exposes organizations using Yoyager v.1.4 or earlier to significant security risks including complete system compromise, data exfiltration, and potential lateral movement within network environments. The remote exploitation capability means that attackers can leverage this vulnerability from any location without requiring physical access to the system, making it particularly dangerous for web-facing applications. The vulnerability essentially allows attackers to establish persistent backdoors, execute malicious commands, and potentially escalate privileges to gain administrative control over the affected system.
The exploitation of this vulnerability demonstrates characteristics consistent with ATT&CK technique T1505.003, which involves server-side web shell deployment through insecure file upload mechanisms. Organizations may experience unauthorized access to sensitive data, system integrity compromise, and potential regulatory compliance violations depending on the nature of data processed by the affected application. The vulnerability's impact extends beyond immediate system compromise as it can serve as a foothold for more sophisticated attacks targeting network infrastructure and additional systems within the organization's attack surface.
Mitigation strategies should focus on implementing proper input validation and file type restrictions for media uploads, enforcing strict permission controls on uploaded files, and applying immediate patches to upgrade to versions of Yoyager that address this vulnerability. Organizations should also implement network segmentation, monitor for unusual file upload activities, and conduct regular security assessments to identify similar insecure permission patterns in other components of their software ecosystem. The remediation process should include comprehensive code reviews to identify and address similar vulnerabilities in the media handling components and overall file upload mechanisms throughout the application architecture.