CVE-2003-1246 in Integrity Protection Driver
Summary
by MITRE
NtCreateSymbolicLinkObject in ntdll.dll in Integrity Protection Driver (IPD) 1.2 and 1.3 allows local users to create and overwrite arbitrary files via a symlink attack on \winnt\system32\drivers using the subst command.
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Analysis
by VulDB Data Team • 07/04/2017
The vulnerability identified as CVE-2003-1246 represents a critical privilege escalation flaw within the Windows operating system's kernel-mode component known as the Integrity Protection Driver (IPD). This vulnerability exists in the NtCreateSymbolicLinkObject function within ntdll.dll, which is part of the Windows NT kernel subsystem responsible for managing system resources and security policies. The flaw specifically affects IPD versions 1.2 and 1.3, which are security components designed to protect system integrity by preventing unauthorized modifications to critical system files and directories. The vulnerability stems from inadequate validation of symbolic link creation operations within the kernel, allowing local attackers to exploit a race condition or improper access control mechanisms when creating symbolic links in the protected \winnt\system32\drivers directory structure.
The technical exploitation of this vulnerability occurs through a carefully crafted symlink attack that leverages the subst command to manipulate the file system namespace. When a local user executes the attack, they can create a symbolic link that points to a target file within the system32\drivers directory, effectively allowing them to overwrite or manipulate files that should normally be protected by the IPD security mechanisms. This creates a scenario where the attacker can bypass the intended security controls by exploiting the lack of proper file system access validation during symbolic link creation. The attack vector specifically targets the Windows NT operating system architecture where the IPD component is designed to enforce strict access controls over critical system directories, but fails to properly validate symbolic link operations that could lead to arbitrary file overwrite scenarios. This vulnerability directly relates to CWE-264, which addresses permissions, privileges, and access controls in software systems, and demonstrates how improper access control validation can lead to privilege escalation.
The operational impact of this vulnerability is severe as it provides local users with the ability to escalate their privileges to system level access, potentially enabling complete system compromise. Once exploited, the attacker can manipulate critical system files, install malicious drivers, or modify system configurations that would normally be protected by the IPD security framework. The vulnerability is particularly dangerous because it operates at the kernel level, making it extremely difficult to detect and remediate without proper system administration intervention. The attack requires local access to the system but does not require network connectivity or specialized tools beyond standard Windows command-line utilities, making it an attractive target for attackers who have already gained a foothold on a compromised system. This vulnerability aligns with ATT&CK technique T1068, which describes local privilege escalation through kernel exploits, and demonstrates how attackers can leverage system-level flaws to gain unauthorized access to critical system resources.
Mitigation strategies for this vulnerability should focus on immediate patching of affected IPD versions, as Microsoft released security updates to address the specific flaw in the symbolic link creation process within ntdll.dll. System administrators should implement strict access controls over system directories, particularly the system32\drivers folder, and monitor for unauthorized symbolic link creation activities. The recommended approach includes disabling the subst command functionality where possible, implementing proper file system permissions, and ensuring that all systems are running the latest security patches. Additionally, organizations should conduct regular security audits to identify and remediate similar access control vulnerabilities in other kernel components, as this vulnerability demonstrates how improper validation of system calls can lead to privilege escalation. The vulnerability also underscores the importance of maintaining up-to-date security frameworks and implementing defense-in-depth strategies that include monitoring for anomalous file system operations and symbolic link creation patterns that could indicate exploitation attempts.