CVE-2023-52331 in Apex Central
Summary
by MITRE • 01/23/2024
A post-authenticated server-side request forgery (SSRF) vulnerability in Trend Micro Apex Central could allow an attacker to interact with internal or local services directly.
Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
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Analysis
by VulDB Data Team • 12/22/2025
The vulnerability identified as CVE-2023-52331 represents a critical server-side request forgery flaw within Trend Micro Apex Central, a comprehensive security management platform designed to monitor and control various security appliances and services. This vulnerability resides in the server-side processing logic that handles external requests, creating a pathway for malicious actors to manipulate the application's behavior and potentially access internal network resources that should remain isolated from external exposure. The flaw specifically manifests when the application processes user-supplied input that controls the destination of HTTP requests, allowing crafted inputs to redirect traffic to internal services without proper validation or authorization checks. The vulnerability classification aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities where applications fail to properly validate or sanitize user-provided URLs or endpoints. This weakness enables attackers to bypass normal network segmentation and access services that are typically restricted to internal networks, potentially exposing sensitive infrastructure components to unauthorized access.
The technical implementation of this vulnerability requires an attacker to first establish a foothold on the target system through a separate authentication bypass or code execution vulnerability, as the exploit itself requires post-authentication privileges to function effectively. Once authenticated, the attacker can leverage the SSRF capability to make requests to internal services such as databases, management interfaces, or other internal systems that are normally protected by network firewalls and access controls. The vulnerability operates by accepting user-controllable input that determines the target of outbound HTTP requests, but fails to properly validate or sanitize this input before processing. This allows an attacker to specify internal IP addresses, localhost references, or other internal endpoints that would normally be inaccessible from external network segments. The attack vector typically involves crafting malicious requests that contain internal service URLs or IP addresses, which the vulnerable application then processes and forwards without proper authorization or network boundary validation, effectively creating a tunnel through the application's security controls.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could enable attackers to conduct reconnaissance of internal network infrastructure, potentially leading to further privilege escalation or lateral movement within the compromised environment. Security professionals should note that the vulnerability's exploitation requires a prior compromise of the target system, making it less likely to be exploited directly from the internet but still highly concerning when combined with other vulnerabilities that could provide initial access. The potential for internal service enumeration and access to sensitive data stored in internal databases or management interfaces creates significant risk for organizations relying on Apex Central for security operations. According to ATT&CK framework, this vulnerability maps to T1190 - Proxying, where attackers use compromised systems to relay requests through internal networks, and T1046 - Network Service Scanning, which could be facilitated by the ability to access internal services directly. Organizations may also face compliance implications if internal systems containing sensitive data become accessible through this vulnerability, particularly in regulated environments where network segmentation is required by standards such as pci dss, hipaa, or soc 2.
Mitigation strategies for CVE-2023-52331 should focus on implementing strict input validation and sanitization for all user-controllable parameters that influence outbound request destinations. Organizations should deploy network segmentation controls to limit access between different network zones, particularly ensuring that management interfaces and internal services are properly isolated from user-facing applications. Application-level protections should include implementing allowlists for valid destination URLs or IP ranges, disabling unnecessary outbound connectivity, and implementing proper authentication and authorization checks for all internal service interactions. Security teams should also consider implementing web application firewalls that can detect and block suspicious patterns in outbound request parameters, as well as monitoring for unusual outbound traffic patterns that may indicate exploitation attempts. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other applications and services, while also ensuring that proper patch management procedures are in place to quickly address any future vulnerabilities that may be discovered in Trend Micro products or other security infrastructure components. The vulnerability serves as a reminder of the importance of maintaining proper network boundaries and implementing defense-in-depth strategies to protect against attacks that leverage compromised systems to access internal resources.