CVE-2001-0860 in Windows
Summary
by MITRE
Terminal Services Manager MMC in Windows 2000 and XP trusts the Client Address (IP address) that is provided by the client instead of obtaining it from the packet headers, which allows clients to spoof their public IP address, e.g. through a Network Address Translation (NAT).
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Analysis
by VulDB Data Team • 04/14/2019
The vulnerability identified as CVE-2001-0860 resides within the Terminal Services Manager Microsoft Management Console component of Windows 2000 and Windows XP operating systems. This security flaw represents a classic case of trust validation failure where the system places undue confidence in client-provided information rather than independently verifying it through network packet analysis. The Terminal Services Manager operates as a graphical interface for managing remote desktop services, making it a critical component for system administration and remote access operations.
The technical implementation of this vulnerability stems from the Terminal Services Manager's reliance on the Client Address field transmitted by the client during connection establishment. Rather than extracting the actual source IP address from the network packet headers, the system accepts the address provided by the client without proper validation. This design decision creates a fundamental security weakness that can be exploited through simple network manipulation techniques. The vulnerability is particularly concerning because it directly impacts the authentication and authorization mechanisms that should prevent unauthorized access to remote desktop services.
The operational impact of this vulnerability extends beyond simple IP address spoofing to encompass broader security implications for remote desktop environments. An attacker exploiting this flaw can effectively mask their true network location by presenting a different IP address to the Terminal Services Manager. This capability becomes particularly dangerous when operating behind Network Address Translation devices, where multiple internal hosts share a single public IP address. The vulnerability enables attackers to bypass network-based access controls that might otherwise restrict connections based on IP address ranges or specific authorized locations.
This vulnerability maps directly to CWE-284, which addresses improper access control issues in software systems. The flaw demonstrates a clear failure in implementing proper input validation and source verification mechanisms. From an adversarial perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1071.004 tactic for application layer protocol usage, specifically targeting remote desktop services. The ability to spoof IP addresses in this context provides attackers with a method to evade network-based detection systems and potentially gain unauthorized access to systems.
The exploitation of this vulnerability requires minimal technical sophistication and can be accomplished through standard network manipulation techniques. Attackers need only configure their client software to present a different IP address in the Client Address field during Terminal Services connection attempts. This makes the vulnerability particularly dangerous as it can be leveraged by adversaries with limited technical expertise while still providing significant access privileges. The impact is amplified in environments where Terminal Services are configured with less restrictive access controls or where network segmentation is insufficient to prevent lateral movement.
Organizations should implement immediate mitigations including network-level restrictions on Terminal Services access, enhanced firewall rules that validate source IP addresses, and deployment of network monitoring solutions that can detect anomalous connection patterns. The recommended approach involves configuring Terminal Services to enforce strict IP address validation and implementing network access control lists that prevent unauthorized IP address spoofing. Additionally, system administrators should consider disabling Terminal Services when not required and implementing stronger authentication mechanisms including multi-factor authentication to reduce the overall risk exposure. Regular network audits and security assessments should be conducted to identify potential exploitation attempts and ensure proper implementation of access controls.