CVE-2024-49089 in Windows
Summary
by MITRE • 12/12/2024
Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 01/08/2025
The Windows Routing and Remote Access Service (RRAS) represents a critical component within Microsoft Windows operating systems that provides network routing capabilities and remote access services to organizations. This service enables users to establish secure connections to remote networks through various protocols including Point-to-Point Protocol (PPP), Layer 2 Tunneling Protocol (L2TP), and Secure Socket Tunneling Protocol (SSTP). The vulnerability identified as CVE-2024-49089 specifically targets the remote code execution capabilities within RRAS, presenting a severe threat to enterprise network infrastructure. This vulnerability exists within the service's handling of remote connections and authentication processes, creating potential attack vectors for malicious actors seeking unauthorized system access. The flaw manifests in the improper validation of input parameters during remote connection establishment, allowing attackers to inject malicious code that executes with elevated privileges. The impact extends beyond individual system compromise as RRAS typically operates with high-privilege accounts, potentially enabling attackers to gain administrative control over entire network segments.
The technical exploitation of CVE-2024-49089 occurs through a buffer overflow condition within the RRAS service implementation, specifically affecting the processing of authentication requests from remote clients. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions that can lead to arbitrary code execution. Attackers can leverage this flaw by sending specially crafted authentication packets to the RRAS service, causing memory corruption that allows for code injection. The vulnerability exists in the service's handling of user credentials and connection parameters, particularly when processing PPP authentication requests. The flaw is particularly dangerous because it requires minimal privileges to exploit and can be executed remotely without requiring prior authentication. The attack surface includes all Windows systems running RRAS with the Remote Access Connection Manager service enabled, affecting Windows Server 2016, Windows Server 2019, and Windows Server 2022 versions. Network-based exploitation is possible since the vulnerable service listens on standard network ports, making it accessible to attackers on the network perimeter.
The operational impact of this vulnerability extends beyond simple system compromise to threaten entire enterprise network infrastructures. Organizations relying on RRAS for remote access services face significant risk of unauthorized network infiltration, particularly in environments where the service is exposed to untrusted networks. The vulnerability can enable attackers to establish persistent backdoors within network infrastructure, allowing for extended surveillance and lateral movement throughout the organization. This threat is compounded by the fact that RRAS typically operates with elevated privileges, meaning successful exploitation could provide attackers with administrative access to network resources. The vulnerability affects organizations using RRAS for various purposes including site-to-site VPN connections, remote desktop services, and dial-up networking. Security incidents involving this vulnerability could result in data breaches, system compromise, and disruption of critical business services. The attack vector is particularly concerning for organizations with remote workforce capabilities, as the vulnerability could be exploited to gain access to internal networks from external locations.
Mitigation strategies for CVE-2024-49089 must address both immediate remediation and long-term security posture improvements. Microsoft has released security patches for this vulnerability through regular Windows updates, and organizations should prioritize immediate deployment of these patches across all affected systems. Network segmentation and access control measures should be implemented to limit exposure of RRAS services to untrusted networks. The principle of least privilege should be enforced by disabling RRAS services on systems where they are not required, particularly in environments where remote access is not necessary. Security monitoring should be enhanced to detect anomalous authentication patterns and unusual network traffic originating from RRAS services. Organizations should implement network intrusion detection systems capable of identifying and blocking malicious authentication packets targeting this vulnerability. The ATT&CK framework categorizes this vulnerability under T1190 for exploitation of remote services and T1059 for command and scripting interpreter execution, indicating the need for comprehensive endpoint detection and response capabilities. Regular security assessments should be conducted to identify and remediate similar vulnerabilities within network infrastructure components, ensuring that all remote access services are properly configured and maintained. Additionally, organizations should consider implementing zero trust network architectures that minimize the attack surface of critical services like RRAS while maintaining necessary business functionality.