CVE-2005-0045 in Windows
Summary
by MITRE
The Server Message Block (SMB) implementation for Windows NT 4.0, 2000, XP, and Server 2003 does not properly validate certain SMB packets, which allows remote attackers to execute arbitrary code via Transaction responses containing (1) Trans or (2) Trans2 commands, aka the "Server Message Block Vulnerability," and as demonstrated using Trans2 FIND_FIRST2 responses with large file name length fields.
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Analysis
by VulDB Data Team • 07/05/2025
The CVE-2005-0045 vulnerability represents a critical buffer overflow flaw in the Server Message Block implementation across multiple Windows operating systems including NT 4.0, 2000, XP, and Server 2003. This vulnerability specifically affects the SMB protocol handling mechanism that processes transaction responses, creating a pathway for remote code execution attacks. The flaw manifests when the system receives specially crafted SMB packets containing Trans or Trans2 commands, particularly in FIND_FIRST2 responses where file name length fields exceed normal parameters. This vulnerability operates at the network protocol level and demonstrates how improper input validation in core system components can lead to severe security implications. The vulnerability has been classified under CWE-121 as a stack-based buffer overflow, which occurs when data is written beyond the boundaries of a fixed-length buffer. The ATT&CK framework categorizes this as a remote code execution technique through protocol manipulation, specifically leveraging SMB as the attack vector.
The technical implementation of this vulnerability exploits the lack of proper bounds checking in SMB packet processing routines. When Windows systems receive Transaction responses with oversized file name fields, the system's memory management routines fail to validate the incoming data length before copying it into fixed-size buffers. This allows attackers to overwrite adjacent memory locations including return addresses and control data structures, effectively enabling arbitrary code execution. The vulnerability is particularly dangerous because it operates at the kernel level within the SMB service, meaning successful exploitation can result in complete system compromise without requiring local user privileges. The specific Trans2 FIND_FIRST2 command creates a scenario where the file name length field is processed without adequate validation, allowing attackers to craft malicious responses that trigger the buffer overflow condition. This type of vulnerability represents a classic example of how network protocol implementations can be exploited when proper input sanitization and bounds checking are not implemented.
The operational impact of CVE-2005-0045 is severe and far-reaching across enterprise environments that rely on Windows SMB services for file sharing and network communication. Attackers can leverage this vulnerability to gain unauthorized access to systems, potentially leading to data breaches, system compromise, and lateral movement within networks. The vulnerability affects systems that are widely deployed in corporate environments, making it particularly attractive to threat actors seeking to exploit unpatched systems. Organizations running these older Windows versions face significant risk as the vulnerability allows for privilege escalation without requiring authentication, creating a direct pathway to system control. The exploitation requires only network access to the target system, making it a highly scalable attack vector that can be automated using various exploitation frameworks. Security professionals must consider the widespread nature of this vulnerability when assessing network security posture, as it affects systems that were once considered secure but have since become legacy components in many organizations.
Mitigation strategies for CVE-2005-0045 require immediate action including applying Microsoft security patches released in March 2005 as part of the Microsoft Security Bulletin MS05-011. Organizations should disable SMB services on systems where they are not required, particularly on perimeter devices and servers that do not need file sharing capabilities. Network segmentation and firewall rules should be implemented to restrict SMB traffic between trusted network segments, limiting potential attack vectors. The implementation of intrusion detection systems capable of identifying suspicious SMB packet patterns can provide additional monitoring capabilities. Security administrators should also consider disabling the SMBv1 protocol entirely, as it is vulnerable to multiple attacks including this one and has been superseded by SMBv2 and later versions. Regular vulnerability scanning and patch management processes should be implemented to identify and remediate similar issues in other system components. Additionally, implementing network access controls and monitoring for unusual SMB activity can help detect potential exploitation attempts, while regular security awareness training should emphasize the importance of timely patch deployment to prevent exploitation of known vulnerabilities.