CVE-2025-48817 in Windows
Summary
by MITRE • 07/08/2025
Relative path traversal in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 08/16/2025
This vulnerability represents a critical security flaw in remote desktop client implementations that enables attackers to perform relative path traversal attacks leading to arbitrary code execution. The issue stems from inadequate input validation and path resolution mechanisms within the remote desktop protocol client software, where user-supplied paths or filenames are not properly sanitized before being processed. When an attacker crafts malicious input containing directory traversal sequences such as ../ or ..\, the client may inadvertently resolve these paths relative to unintended directories, potentially allowing access to sensitive system resources or files that should remain protected. This weakness falls under the common weakness enumeration CWE-23 which specifically addresses improper restriction of operations within a limited scope and aligns with ATT&CK technique T1059.3.001 for command and scripting interpreter usage. The operational impact of such vulnerabilities extends beyond simple file access, as attackers can leverage this weakness to escalate privileges, execute malicious payloads, or establish persistent backdoors within the target environment. In typical scenarios, an attacker might exploit this vulnerability by sending specially crafted remote desktop connection parameters or configuration files that contain malicious path traversal sequences, effectively bypassing normal access controls and security boundaries. The attack surface is particularly concerning in enterprise environments where remote desktop services are extensively used for legitimate business purposes, as a successful exploitation could provide attackers with full system compromise capabilities.
The technical implementation of this vulnerability often occurs when the client application fails to properly validate or canonicalize file paths before processing them within the remote desktop session context. This typically manifests when the client handles remote file operations, configuration file parsing, or connection parameter validation without adequate sanitization measures. The flaw becomes exploitable when the application processes user input that contains path traversal sequences and resolves them against system directories without proper access controls or path normalization. Security standards such as NIST SP 800-53 and ISO/IEC 27001 emphasize the importance of input validation and secure coding practices to prevent such vulnerabilities, while the CWE catalog specifically identifies this pattern as a common vector for privilege escalation attacks. Organizations implementing remote desktop solutions must ensure that all path resolution operations are performed with strict validation and access control mechanisms to prevent attackers from manipulating file paths to gain unauthorized access to system resources.
Mitigation strategies for this vulnerability require comprehensive defensive measures spanning multiple layers of the security infrastructure. Network administrators should implement strict input validation on all remote desktop client configurations and connection parameters, ensuring that any path-related inputs are properly sanitized before processing. The principle of least privilege must be enforced by configuring remote desktop services to operate with minimal required permissions and restricting access to only authorized users and systems. Regular security assessments and penetration testing should include specific checks for path traversal vulnerabilities within remote desktop implementations, utilizing automated scanning tools alongside manual code reviews. Organizations should also implement network segmentation and monitoring solutions that can detect anomalous path traversal attempts or unusual file access patterns during remote desktop sessions. The implementation of secure coding practices including parameterized queries, input sanitization, and proper path resolution functions helps prevent exploitation opportunities while maintaining legitimate functionality. Additionally, security patches and updates should be applied promptly to address known vulnerabilities in remote desktop client software, as vendors frequently release fixes for discovered path traversal flaws. These measures collectively reduce the attack surface and provide defense-in-depth capabilities that protect against both current and emerging threats targeting remote desktop client implementations.