CVE-2025-26664 in Windows
Summary
by MITRE • 04/08/2025
Buffer over-read in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 04/08/2025
The vulnerability in question represents a critical buffer over-read flaw within the Windows Routing and Remote Access Service that enables unauthorized remote attackers to extract sensitive information from affected systems. This issue specifically impacts the RRAS component responsible for managing network routing and remote access functionalities, making it a significant concern for enterprise environments that rely on these services for connectivity and security. The vulnerability stems from inadequate input validation and memory management within the service's processing routines, creating an opportunity for attackers to manipulate data structures and trigger unintended memory access patterns.
The technical implementation of this flaw involves the RRAS service failing to properly validate buffer boundaries when processing incoming network requests or configuration data. When malformed input is received, the service attempts to read beyond allocated memory regions, potentially exposing sensitive data such as stack contents, heap information, or other system memory segments that contain confidential information. This over-read behavior aligns with common software security vulnerabilities classified under CWE-125 as "Out-of-bounds Read" and represents a fundamental flaw in defensive programming practices. The vulnerability can be exploited through network-based attacks without requiring authentication, making it particularly dangerous for systems accessible from untrusted networks or the internet.
The operational impact of this vulnerability extends beyond simple information disclosure, as the leaked memory contents could potentially contain credentials, session tokens, cryptographic keys, or other sensitive data that could be leveraged for further attacks. Attackers might use the disclosed information to perform credential harvesting, conduct advanced persistent threats, or exploit additional vulnerabilities within the network infrastructure. The nature of RRAS services makes them attractive targets since they often operate with elevated privileges and maintain connections to various network segments. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1567 (Exfiltration Over Web Service) techniques, demonstrating how information gathering can lead to broader compromise opportunities.
Mitigation strategies should focus on immediate patch deployment through Microsoft security updates, which address the underlying buffer management issues in the RRAS implementation. Organizations should also implement network segmentation to limit exposure of RRAS services to untrusted networks and consider disabling unnecessary remote access capabilities until patches are applied. Additional protective measures include monitoring network traffic for anomalous patterns that might indicate exploitation attempts, implementing intrusion detection systems with signature-based detection for known exploit patterns, and conducting regular security assessments of routing infrastructure components. The vulnerability highlights the importance of robust input validation and memory safety practices in network service implementations, emphasizing the need for comprehensive security testing including fuzzing and static analysis to identify similar issues in other system components.