CVE-2023-21797 in Windows
Summary
by MITRE • 02/14/2023
Microsoft ODBC Driver Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 03/15/2023
The Microsoft ODBC Driver Remote Code Execution Vulnerability identified as CVE-2023-21797 represents a critical security flaw that enables remote attackers to execute arbitrary code on affected systems. This vulnerability specifically impacts the ODBC (Open Database Connectivity) driver components used for database connectivity in Microsoft environments, making it particularly dangerous for enterprise networks that rely heavily on database operations and connectivity. The flaw exists within the way the ODBC driver processes certain input data, creating a pathway for malicious actors to bypass normal security controls and gain unauthorized access to system resources.
The technical implementation of this vulnerability stems from improper input validation within the ODBC driver's processing mechanisms, which falls under the Common Weakness Enumeration category of CWE-121. This weakness occurs when the driver fails to properly validate and sanitize data inputs before processing them, leading to potential buffer overflow conditions or memory corruption scenarios. Attackers can exploit this by crafting malicious database connection strings or data payloads that trigger the vulnerable code path, ultimately allowing them to execute malicious code with the privileges of the affected process. The vulnerability is particularly concerning because it can be exploited remotely without requiring authentication, making it an attractive target for automated attacks and zero-day exploitation campaigns.
From an operational perspective, the impact of CVE-2023-21797 extends far beyond simple code execution capabilities. Organizations utilizing Microsoft ODBC drivers across their infrastructure face significant risk of data breaches, system compromise, and potential lateral movement within their networks. The vulnerability can facilitate privilege escalation attacks and provide attackers with persistent access to critical database systems and the sensitive information they contain. According to ATT&CK framework methodology, this vulnerability maps to multiple techniques including T1059.007 for command and script interpreter and T1046 for network service discovery, as attackers can use the compromised system to explore network resources and identify additional targets for exploitation. The remote nature of the exploit means that attackers can target systems from outside the network perimeter, significantly expanding their attack surface and reducing the effectiveness of traditional network security controls.
Mitigation strategies for CVE-2023-21797 should prioritize immediate patch deployment from Microsoft, as the vendor has released security updates addressing the specific vulnerability in affected ODBC driver versions. Organizations should also implement network segmentation and access controls to limit the potential impact of successful exploitation attempts. Additional protective measures include monitoring for unusual database connection patterns, implementing network intrusion detection systems, and conducting regular vulnerability assessments to identify systems that may be running unpatched versions of the ODBC driver. Security teams should also consider implementing application whitelisting policies and disabling unnecessary database connectivity features to reduce the attack surface. The vulnerability's classification as a remote code execution flaw necessitates immediate attention and comprehensive remediation efforts across all affected systems to prevent potential compromise of critical enterprise data and infrastructure resources.