CVE-2025-46385 in Emby
Summary
by MITRE • 07/20/2025
CWE-918 Server-Side Request Forgery (SSRF)
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/20/2025
Server-Side Request Forgery represents a critical vulnerability where attackers can manipulate a server into making unintended requests to internal or external systems. This weakness falls under the broader category of insecure direct object references and allows adversaries to bypass access controls by leveraging the server's network privileges. The vulnerability typically occurs when user input is directly used in constructing URLs without proper validation or sanitization, enabling attackers to redirect requests through the vulnerable server. According to the Common Weakness Enumeration framework, CWE-918 specifically addresses scenarios where servers process external or internal resource identifiers without adequate security measures. The attack vector often involves manipulating parameters such as hostnames, ports, or protocols in HTTP requests, allowing threat actors to access internal network resources that should otherwise be protected by firewalls or access controls.
The operational impact of SSRF vulnerabilities can be severe and far-reaching, potentially exposing sensitive internal systems, databases, and services to unauthorized access. Attackers may use this vulnerability to scan internal networks, access administrative interfaces, retrieve confidential data, or even establish command and control channels. The attack surface expands significantly when servers are configured with default credentials or when internal systems lack proper authentication mechanisms. This weakness is particularly dangerous in cloud environments where servers might have elevated privileges and access to multiple services within the same network infrastructure. Network security professionals often observe that SSRF attacks frequently target misconfigured load balancers, application servers, or proxy systems that process user-supplied URLs without sufficient validation.
Mitigation strategies for SSRF vulnerabilities require a multi-layered approach combining input validation, network segmentation, and proper access controls. Organizations should implement strict URL validation mechanisms that reject suspicious protocols such as file://, dict://, or gopher:// which are commonly exploited in SSRF attacks. The principle of least privilege must be enforced by ensuring servers only have access to necessary internal resources through firewall rules and network segmentation. Additionally, implementing outbound traffic filtering and monitoring can help detect anomalous requests originating from vulnerable applications. Security controls should include validating that requested URLs conform to expected patterns and rejecting any input that attempts to reference internal IP ranges or privileged ports. Organizations can also leverage security frameworks such as the ATT&CK matrix to understand potential attack patterns and implement corresponding defensive measures.
The prevalence of SSRF vulnerabilities across various technologies demonstrates the persistent nature of this weakness in modern applications. Many popular frameworks and libraries have been found vulnerable to SSRF attacks, particularly those that handle HTTP requests or process external resources without proper sanitization. The vulnerability often manifests in web applications, APIs, and microservices architectures where user input is processed through server-side components. Security testing should include comprehensive validation of all parameters that could influence URL construction and network requests. Regular security assessments and penetration testing help identify potential SSRF vectors before they can be exploited by malicious actors. Organizations implementing robust security measures typically see reduced risk exposure when proper input validation, network access controls, and monitoring systems are in place to detect and prevent unauthorized server-side requests.
Modern defense strategies against SSRF vulnerabilities emphasize both preventive and detective controls. Prevention involves implementing strict input validation rules that filter out dangerous protocols and address ranges, while detection focuses on monitoring network traffic for suspicious patterns and unusual request behaviors. The use of security automation tools and intrusion detection systems can help identify potential SSRF attempts in real-time. Organizations should also consider implementing service mesh architectures or API gateways that provide centralized control over external communications and can enforce security policies consistently across applications. Regular updates to security frameworks, including adherence to industry standards such as OWASP Top Ten and NIST cybersecurity guidelines, help maintain effective protection against evolving SSRF attack techniques.