CVE-2008-5725 in PowerStrip
Summary
by MITRE
The NT kernel-mode driver (aka pstrip.sys) 5.0.1.1 and earlier in EnTech Taiwan PowerStrip 3.84 and earlier allows local users to gain privileges via certain IRP parameters in an IOCTL request to \Device\Powerstrip1 that overwrites portions of memory.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 11/20/2024
The vulnerability identified as CVE-2008-5725 represents a critical privilege escalation flaw within the NT kernel-mode driver component of EnTech Taiwan PowerStrip software. This vulnerability specifically affects versions 5.0.1.1 and earlier of the pstrip.sys driver, which is part of PowerStrip 3.84 and earlier releases. The flaw exists in the kernel-mode driver's handling of Input/Output Control (IOCTL) requests, creating a pathway for local attackers to execute arbitrary code with elevated privileges. The vulnerability manifests when certain IRP parameters are manipulated during IOCTL communication with the \Device\Powerstrip1 device interface, allowing attackers to overwrite critical memory regions within the kernel space.
The technical implementation of this vulnerability stems from inadequate input validation and parameter handling within the kernel-mode driver. When the pstrip.sys driver processes IOCTL requests directed to \Device\Powerstrip1, it fails to properly validate or sanitize the IRP parameters provided by the user-mode application. This lack of proper parameter validation creates a buffer overflow condition or memory corruption scenario where attacker-controlled data can overwrite adjacent memory locations. The vulnerability specifically targets the driver's handling of IOCTL codes, which are used to communicate between user-mode applications and kernel-mode drivers. The flaw allows an attacker to craft malicious IOCTL requests that manipulate memory layout in ways that can lead to privilege escalation from standard user context to kernel-level privileges.
The operational impact of this vulnerability is severe as it enables local privilege escalation attacks that can result in complete system compromise. An attacker with local access to a vulnerable system can exploit this vulnerability to execute code with kernel-level privileges, effectively bypassing all user-mode security controls and protections. This includes the ability to bypass User Access Control, disable security features, modify system files, install malicious software, and potentially establish persistent backdoors. The vulnerability is particularly dangerous because it requires minimal privileges to exploit and can be leveraged to gain complete control over the affected system. The attack vector is relatively simple since it only requires local access to the system and knowledge of the specific device interface and IOCTL codes.
Mitigation strategies for this vulnerability should focus on immediate patching and system hardening measures. The primary solution involves updating to a patched version of EnTech Taiwan PowerStrip that addresses the kernel-mode driver vulnerability. System administrators should also implement the principle of least privilege by restricting local user access to systems running vulnerable software. Additional protective measures include disabling unnecessary device interfaces, implementing driver signature enforcement, and monitoring for suspicious IOCTL activity. From a cybersecurity perspective, this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of kernel-mode privilege escalation that maps to ATT&CK technique T1068. Organizations should also consider implementing runtime protection mechanisms and endpoint detection and response solutions to identify potential exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation in kernel-mode drivers and highlights the severe consequences that can result from inadequate security controls in system-level software components.