CVE-2011-1968 in Windows
Summary
by MITRE
The Remote Desktop Protocol (RDP) implementation in Microsoft Windows XP SP2 and SP3 and Windows Server 2003 SP2 does not properly process packets in memory, which allows remote attackers to cause a denial of service (reboot) by sending crafted RDP packets triggering access to an object that (1) was not properly initialized or (2) is deleted, as exploited in the wild in 2011, aka "Remote Desktop Protocol Vulnerability."
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Analysis
by VulDB Data Team • 01/12/2025
The CVE-2011-1968 vulnerability represents a critical denial of service flaw within Microsoft Windows operating systems that has significant implications for enterprise network security. This vulnerability specifically targets the Remote Desktop Protocol implementation in Windows XP Service Pack 2 and 3, as well as Windows Server 2003 Service Pack 2, making it particularly dangerous given the widespread deployment of these systems in corporate environments. The vulnerability operates at the protocol level, exploiting weaknesses in how RDP processes incoming network packets, which creates a pathway for remote attackers to disrupt system availability without requiring authentication or elevated privileges.
The technical mechanism behind this vulnerability involves improper memory management within the RDP implementation where packets are processed without adequate validation of object states. When attackers send specially crafted RDP packets, the system attempts to access memory objects that either have not been properly initialized or have already been deleted from memory. This creates a condition known as a use-after-free vulnerability, which falls under CWE-416, where a program accesses memory after it has been freed. The exploitation occurs when the RDP service processes these malformed packets and attempts to reference invalid memory locations, causing the system to crash and reboot automatically. This behavior aligns with ATT&CK technique T1499.004, which covers network denial of service attacks targeting system availability.
The operational impact of this vulnerability extends beyond simple system disruption, as it represents a significant threat to business continuity and network stability. Organizations running affected systems face the risk of unannounced service outages that can affect productivity and customer access to critical services. The vulnerability's exploitation in the wild during 2011 demonstrated its practical danger, as attackers could remotely reboot systems without requiring any authentication credentials, making it particularly attractive for malicious actors seeking to disrupt operations. The widespread nature of Windows XP and Server 2003 deployments at the time meant that this vulnerability could potentially affect numerous systems across different organizations, creating a cascading effect that could impact entire network infrastructures.
Mitigation strategies for CVE-2011-1968 primarily focus on immediate patching and network-level protections. Microsoft released security updates that addressed the memory handling issues within the RDP implementation, and organizations should prioritize applying these patches to all affected systems. Network segmentation and access control measures can provide additional protection by limiting RDP access to trusted networks and implementing firewall rules that restrict RDP traffic to necessary sources only. The implementation of intrusion detection systems can help identify attempts to exploit this vulnerability by monitoring for unusual RDP packet patterns. Organizations should also consider disabling RDP access where possible and implementing alternative remote access solutions with better security track records. Additionally, monitoring systems for unexpected reboots and implementing robust backup and recovery procedures ensures that organizations can quickly restore services if exploitation occurs, while maintaining compliance with security standards such as those outlined in the NIST Cybersecurity Framework and ISO 27001 requirements for system availability and integrity.