CVE-2023-5604 in Asgaros Forum Plugin
Summary
by MITRE • 11/27/2023
The Asgaros Forum WordPress plugin before 2.7.1 allows forum administrators, who may not be WordPress (super-)administrators, to set insecure configuration that allows unauthenticated users to upload dangerous files (e.g. .php, .phtml), potentially leading to remote code execution.
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Analysis
by VulDB Data Team • 07/12/2024
The vulnerability identified as CVE-2023-5604 affects the Asgaros Forum WordPress plugin version 2.7.1 and earlier, presenting a critical security risk through improper access control mechanisms. This flaw enables forum administrators to configure the plugin in a manner that permits unauthenticated users to upload potentially malicious files, creating a pathway for remote code execution. The vulnerability stems from insufficient validation and authorization checks within the file upload functionality, allowing users with limited privileges to manipulate plugin settings that should be restricted to super administrators only. The security implications are particularly severe because the affected plugin operates within the WordPress ecosystem where administrative privileges are carefully segmented to maintain system integrity and prevent unauthorized access to critical system functions.
The technical implementation of this vulnerability involves a privilege escalation mechanism where forum administrators can modify configuration parameters that control file upload restrictions. Specifically, the plugin fails to properly validate whether the user attempting to change upload settings possesses the appropriate administrative clearance. This misconfiguration allows users with forum administrator roles to disable security measures that would normally prevent execution of potentially dangerous file types such as php and phtml scripts. The underlying flaw aligns with CWE-285, which addresses insufficient authorization in security-critical functions, and represents a classic case of inadequate access control validation. The vulnerability exists in the plugin's settings management interface where configuration changes are applied without proper verification of user credentials and permission levels.
From an operational perspective, this vulnerability creates a significant attack surface that can be exploited by malicious actors to gain unauthorized control over affected WordPress installations. The impact extends beyond simple privilege escalation as it allows attackers to execute arbitrary code on the server, potentially leading to complete system compromise. Attackers can upload web shells or other malicious payloads that provide persistent access to the compromised system, enabling data exfiltration, lateral movement, and further exploitation of network resources. The vulnerability's exploitation is particularly concerning because it does not require authentication to perform the initial upload, making it accessible to anyone with access to the forum interface. This aligns with ATT&CK technique T1505.003 for server-side web shell execution and T1078 for valid accounts usage, as the compromised system can be leveraged for ongoing unauthorized access and command execution.
Mitigation strategies for CVE-2023-5604 primarily focus on immediate plugin updates to version 2.7.1 or later, which contain the necessary security patches to address the privilege escalation issue. System administrators should also implement additional defensive measures including restricting access to plugin configuration settings, monitoring file upload activities, and implementing web application firewalls to detect and block suspicious upload attempts. Regular security audits of WordPress plugins and themes are essential to identify similar vulnerabilities that may exist in other third-party components. The vulnerability highlights the importance of principle of least privilege enforcement and proper role-based access control implementation within WordPress plugins, ensuring that administrative functions requiring elevated privileges are appropriately restricted. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates and maintain comprehensive backup strategies to recover from potential exploitation attempts.