CVE-2011-5202 in WinCDEmu
Summary
by MITRE
BazisVirtualCDBus.sys in WinCDEmu 3.6 allows local users to cause a denial of service (system crash) via the unmount command to batchmnt.exe.
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Analysis
by VulDB Data Team • 02/22/2019
The vulnerability identified as CVE-2011-5202 resides within the BazisVirtualCDBus.sys kernel driver component of WinCDEmu version 3.6, representing a critical denial of service flaw that can be exploited by local attackers to crash the target system. This vulnerability specifically manifests when the unmount command is executed against batchmnt.exe, a utility designed to manage virtual disk operations within the WinCDEmu framework. The flaw stems from insufficient input validation and improper error handling within the kernel-mode driver, which fails to properly sanitize or validate the parameters passed during the unmount operation sequence.
The technical exploitation of this vulnerability occurs through a local privilege escalation pathway where an attacker with minimal system access can manipulate the batchmnt.exe utility to trigger a malformed unmount command. The BazisVirtualCDBus.sys driver lacks proper bounds checking and parameter validation mechanisms, allowing malicious input to corrupt kernel memory structures or cause invalid memory access violations. This type of vulnerability falls under the Common Weakness Enumeration category of weak input validation and improper error handling, specifically mapping to CWE-129 and CWE-20 respectively. The flaw demonstrates characteristics consistent with buffer overflow conditions and memory corruption vulnerabilities that can lead to system instability.
From an operational impact perspective, this vulnerability creates a significant risk for systems running WinCDEmu 3.6, as local users can reliably trigger system crashes and potential blue screen errors. The denial of service condition affects system availability and can disrupt legitimate user operations, particularly in environments where virtualization or optical drive emulation is actively used. The vulnerability is particularly concerning because it requires minimal privileges to exploit and can be automated through simple batch file execution, making it accessible to less sophisticated attackers. The attack vector aligns with ATT&CK technique T1489 which focuses on denial of service attacks through system manipulation.
Mitigation strategies for this vulnerability should include immediate patching of the WinCDEmu software to version 4.0 or later, which contains the necessary fixes for the kernel driver issues. System administrators should also implement proper access controls to limit local user privileges and monitor for suspicious batch file execution patterns. Additional defensive measures include disabling unnecessary virtual drive emulation features, implementing application whitelisting policies, and conducting regular vulnerability assessments to identify similar kernel-mode driver vulnerabilities. The remediation approach should follow industry best practices for kernel-level vulnerability management and align with security frameworks such as NIST SP 800-128 for system hardening and vulnerability remediation. Organizations should also consider implementing endpoint detection and response solutions to monitor for exploitation attempts targeting kernel-mode components.