CVE-2001-0162 in Windows
Summary
by MITRE
WinCE 3.0.9348 generates predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.
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Analysis
by VulDB Data Team • 11/25/2024
The vulnerability described in CVE-2001-0162 represents a critical weakness in the Windows CE 3.0 operating system that affects network security through predictable sequence number generation. This issue specifically impacts the TCP protocol implementation within the embedded operating system, creating a significant attack surface that adversaries can exploit to compromise network communications. The vulnerability stems from the predictable nature of Initial Sequence Numbers generated by the WinCE 3.0 TCP stack, which violates fundamental security principles required for secure network communication protocols.
The technical flaw in this vulnerability resides in the cryptographic randomness of TCP Initial Sequence Numbers within the Windows CE 3.0 implementation. According to the Common Weakness Enumeration framework, this corresponds to weakness category CWE-330, which addresses the use of insufficiently random values. The predictable ISN generation occurs because the operating system's TCP stack uses a deterministic algorithm or insufficient entropy sources when generating sequence numbers for new TCP connections. This weakness directly enables attackers to perform TCP sequence number prediction attacks, where an attacker can accurately guess the next sequence number in an established connection, allowing for connection hijacking and spoofing operations.
The operational impact of this vulnerability is severe and far-reaching within embedded systems environments where Windows CE 3.0 is deployed. Attackers can exploit this weakness to perform man-in-the-middle attacks, hijack active TCP sessions, and potentially gain unauthorized access to network services running on affected devices. The vulnerability particularly affects industrial control systems, embedded network appliances, and mobile devices that rely on Windows CE 3.0 for their network operations. According to the MITRE ATT&CK framework, this vulnerability maps to technique T1071.004 for application layer protocol: DNS and T1566.001 for credential access through credential dumping, as attackers can leverage connection hijacking to gain access to sensitive communications and potentially extract credentials transmitted over the compromised connections.
Mitigation strategies for this vulnerability require immediate system updates and configuration changes to address the predictable sequence number generation. Organizations should implement the latest security patches provided by Microsoft for Windows CE 3.0, as well as consider network-level protections such as TCP sequence number randomization at the firewall level. The implementation of additional security controls including encrypted communications, intrusion detection systems, and network monitoring can help detect and prevent exploitation attempts. According to industry best practices and NIST guidelines, system administrators should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts, while ensuring that affected systems are properly isolated from critical network infrastructure until appropriate patches are deployed.