CVE-2018-15657 in SureMDM
Summary
by MITRE
An SSRF issue was discovered in 42Gears SureMDM before 2018-11-27 via the /api/DownloadUrlResponse.ashx "url" parameter.
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Analysis
by VulDB Data Team • 11/16/2025
The vulnerability CVE-2018-15657 represents a server-side request forgery flaw in 42Gears SureMDM software prior to version 2018-11-27. This issue exists within the application's handling of external resource requests through the /api/DownloadUrlResponse.ashx endpoint, specifically in the "url" parameter processing. The flaw allows an attacker to manipulate the url parameter to make the application fetch resources from arbitrary locations, potentially enabling unauthorized access to internal systems or sensitive data. This vulnerability falls under the category of CWE-918, which describes server-side request forgery where an attacker can manipulate a server to make requests to internal resources that would normally be inaccessible from the external network.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the DownloadUrlResponse.ashx handler. When a user submits a request containing a url parameter, the application fails to properly validate or restrict the input, allowing malicious actors to specify targets that could include internal network addresses, localhost references, or other sensitive endpoints. The vulnerability is particularly concerning because it operates at the server level, where the application may have elevated privileges and access to internal network resources that are not typically exposed to external users. This creates a potential attack vector for reconnaissance, data exfiltration, or further exploitation of internal systems.
The operational impact of this vulnerability extends beyond simple information disclosure. An attacker could leverage the SSRF flaw to perform internal network scanning, access internal APIs, or even attempt to exploit other vulnerabilities within the internal network infrastructure. The attack surface is significantly expanded because the vulnerable application may be running with elevated privileges, potentially allowing access to administrative interfaces, database connections, or other critical internal services. This vulnerability can be particularly dangerous in enterprise environments where mobile device management systems often have access to sensitive corporate data and internal network resources. The flaw can be exploited through simple HTTP requests, making it accessible to attackers with minimal technical expertise while still providing substantial potential for damage.
Mitigation strategies for CVE-2018-15657 should focus on implementing robust input validation and parameter sanitization within the affected endpoint. Organizations should ensure that all external resource requests are properly validated against a whitelist of acceptable domains or IP addresses, with strict restrictions on localhost, private network ranges, and internal addresses. The implementation should follow the principle of least privilege, ensuring that the application does not have unnecessary access to internal resources. Additionally, network segmentation and firewall rules should be implemented to restrict access to internal services from external-facing applications. Regular security updates and patch management are essential, as this vulnerability was addressed in version 2018-11-27 of SureMDM. Organizations should also implement monitoring and logging for unusual external resource requests to detect potential exploitation attempts. The vulnerability aligns with ATT&CK technique T1106 for execution through legitimate user processes, and T1071 for application layer protocol usage, making it a significant concern for enterprise security posture and compliance requirements.