CVE-2012-0152 in Windows
Summary
by MITRE
The Remote Desktop Protocol (RDP) service in Microsoft Windows Server 2008 R2 and R2 SP1 and Windows 7 Gold and SP1 allows remote attackers to cause a denial of service (application hang) via a series of crafted packets, aka "Terminal Server Denial of Service Vulnerability."
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Analysis
by VulDB Data Team • 03/21/2021
The CVE-2012-0152 vulnerability represents a critical denial of service flaw within Microsoft's Remote Desktop Protocol implementation that affects Windows Server 2008 R2 and its service pack versions, as well as Windows 7 systems. This vulnerability specifically targets the Terminal Services component that handles remote desktop connections, creating a scenario where malicious actors can exploit the protocol's handling of certain packet sequences to induce application hangs and system instability. The vulnerability falls under the category of protocol-level flaws that can be exploited without requiring authentication or elevated privileges, making it particularly dangerous in enterprise environments where remote access capabilities are extensively utilized.
The technical mechanism behind this vulnerability involves the improper handling of specific RDP packet structures by the Terminal Services service. When the service receives a sequence of crafted packets that manipulate the protocol's state machine or connection handling logic, it enters a condition where it becomes unresponsive or enters an infinite loop, effectively causing the application to hang. This occurs because the protocol implementation lacks proper input validation and boundary checking for certain packet fields that control connection state transitions. The flaw is classified as a CWE-129 weakness, specifically related to insufficient boundary checking, and represents a classic example of a buffer over-read or state machine manipulation attack vector.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise business continuity and availability of critical systems. Organizations relying on remote desktop access for administrative tasks, employee connectivity, or system maintenance face significant risks when this vulnerability exists in their environment. The denial of service condition can persist for extended periods, requiring system restarts to restore normal operations, which can result in substantial downtime and productivity losses. From an attacker perspective, this vulnerability aligns with ATT&CK technique T1499.004, which focuses on network denial of service attacks, and represents a low-effort, high-impact method for disrupting services without requiring sophisticated exploitation capabilities.
Mitigation strategies for CVE-2012-0152 should include immediate deployment of Microsoft's security patches and updates, particularly the MS12-006 update that specifically addresses this vulnerability. Organizations should also implement network segmentation and access controls to limit exposure of RDP services to trusted networks only, while monitoring for unusual traffic patterns that might indicate exploitation attempts. Network-level protections such as firewall rules that restrict RDP access to specific IP ranges and the implementation of RDP-specific security measures like network level authentication can significantly reduce the attack surface. Additionally, regular vulnerability assessments and penetration testing should be conducted to identify and remediate similar protocol-level weaknesses that may exist in other network services. The vulnerability demonstrates the importance of proper input validation in protocol implementations and highlights the need for robust error handling mechanisms in network services that process external data streams.