CVE-2024-38134 in Windows
Summary
by MITRE • 08/13/2024
Kernel Streaming WOW Thunk Service Driver Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 05/20/2025
This vulnerability exists within the kernel streaming wow thunk service driver component of microsoft windows operating systems where improper input validation and privilege handling allows local attackers to escalate their privileges from standard user level to system level execution. The flaw specifically manifests in how the driver processes certain api calls and manages memory allocation during wow64 (windows on windows 64) compatibility mode operations. The vulnerability is classified as a privilege escalation issue that can be exploited through crafted malicious code running in user context, which then leverages the driver's insufficient access controls to gain kernel-level privileges.
The technical implementation of this vulnerability involves memory corruption within the driver's handling of specific streaming service requests where buffer overflows or improper pointer dereferences occur during wow64 thunk operations. Attackers can manipulate input parameters passed through the kernel streaming interface to trigger memory corruption that subsequently leads to arbitrary code execution in kernel space. This type of vulnerability falls under cwe-121 buffer overflow conditions and cwe-787 out-of-bounds write, both of which are commonly exploited for privilege escalation attacks within windows kernel components. The exploitation typically requires a local attacker who can execute code in user context but does not require network access or remote exploitation capabilities.
The operational impact of this vulnerability is severe as it provides complete system compromise when successfully exploited. Once an attacker achieves kernel-level privileges, they can bypass all windows security mechanisms including user access control, file system protections, and memory isolation features. The attacker gains the ability to modify any system files, install rootkits, access encrypted data, and establish persistent backdoors. This vulnerability directly maps to attack techniques described in the mitre att&ck framework under privilege escalation tactics such as exploitation for privilege escalation and persistence mechanisms. The attack surface is limited to local systems where the vulnerable driver is present, making it particularly dangerous in environments with compromised user accounts or insider threats.
Mitigation strategies for this vulnerability should focus on immediate patching of affected windows versions through microsoft security updates which typically address the specific buffer handling issues within the kernel streaming wow thunk driver. System administrators should implement principle of least privilege controls and disable unnecessary services to reduce attack surface. Additional defensive measures include enabling windows exploit protection features such as data execution prevention, address space layout randomization, and controlling user privileges through group policy settings. Monitoring for suspicious driver activity and anomalous system behavior can help detect exploitation attempts. Organizations should also consider implementing application whitelisting policies and maintaining current antivirus definitions to detect potential exploitation attempts targeting this specific vulnerability class. The remediation process must include comprehensive testing of patches in controlled environments before deployment to production systems to ensure compatibility with existing applications and services.