CVE-2017-0145 in Windows
Summary
by MITRE
The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607; and Windows Server 2016 allows remote attackers to execute arbitrary code via crafted packets, aka "Windows SMB Remote Code Execution Vulnerability." This vulnerability is different from those described in CVE-2017-0143, CVE-2017-0144, CVE-2017-0146, and CVE-2017-0148.
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Analysis
by VulDB Data Team • 12/26/2024
The vulnerability identified as CVE-2017-0145 represents a critical remote code execution flaw within the Server Message Block version 1 protocol implementation in multiple Microsoft Windows operating systems. This vulnerability specifically affects Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, and 1607, as well as Windows Server 2016. The flaw resides in the SMBv1 server component that handles network file sharing operations, making it particularly dangerous in enterprise environments where file sharing is prevalent. The vulnerability enables remote attackers to execute arbitrary code on affected systems without authentication, creating a significant attack surface that could lead to complete system compromise.
The technical root cause of this vulnerability stems from improper input validation within the SMBv1 server implementation when processing specially crafted packets. The flaw occurs during the handling of specific SMB protocol requests that contain malformed data structures, leading to memory corruption conditions that can be exploited to gain remote code execution privileges. This type of vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. The vulnerability's exploitation requires an attacker to send malicious SMB packets to the target system, which then triggers the buffer overflow condition in the SMB server component. The attack vector is particularly concerning because SMBv1 is often enabled by default in older Windows versions, and the protocol is commonly used in network environments for file sharing and authentication services.
From an operational impact perspective, this vulnerability poses severe risks to enterprise networks and organizations that have not migrated away from SMBv1 protocols. The ability to execute arbitrary code remotely without authentication makes this vulnerability particularly attractive to threat actors, as it can be exploited to establish persistent backdoors, escalate privileges, or deploy additional malware payloads. The vulnerability's impact extends beyond individual system compromise to potentially enable lateral movement within networks, as SMBv1 is frequently used for authentication and file sharing between systems. Organizations running affected Windows versions are at risk of complete network compromise, especially in environments where legacy systems still rely on SMBv1 for operations. The vulnerability's exploitation can lead to data breaches, system downtime, and significant financial losses due to the potential for widespread impact across networked systems.
Mitigation strategies for CVE-2017-0145 should focus on immediate remediation through Microsoft security updates, which were released as part of the patch Tuesday updates in March 2017. Organizations should prioritize disabling SMBv1 protocol entirely on all affected systems, as this represents the most effective long-term solution to prevent exploitation. The Windows SMBv1 server component can be disabled using registry modifications or group policy configurations, and network administrators should implement firewall rules to block SMB traffic on ports 139 and 445. Additionally, organizations should conduct comprehensive vulnerability assessments to identify any remaining systems that may still be running SMBv1, as the protocol is vulnerable to several other exploits including the infamous WannaCry ransomware attack that leveraged similar SMB vulnerabilities. The implementation of network monitoring solutions and intrusion detection systems can help detect exploitation attempts, while regular security audits should ensure that SMBv1 remains disabled across all networked systems. This vulnerability aligns with ATT&CK technique T1075, which covers use of legitimate credentials for lateral movement, and T1210, which covers exploitation of remote services, making comprehensive network security measures essential for protecting against both this specific vulnerability and similar threats.