CVE-2010-5155 in Blink
Summary
by MITRE
** DISPUTED ** Race condition in Blink Professional 4.6.1 on Windows XP allows local users to bypass kernel-mode hook handlers, and execute dangerous code that would otherwise be blocked by a handler but not blocked by signature-based malware detection, via certain user-space memory changes during hook-handler execution, aka an argument-switch attack or a KHOBE attack. NOTE: this issue is disputed by some third parties because it is a flaw in a protection mechanism for situations where a crafted program has already begun to execute.
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Analysis
by VulDB Data Team • 08/07/2024
The vulnerability described in CVE-2010-5155 represents a sophisticated race condition within Blink Professional 4.6.1 on Windows XP systems that fundamentally undermines kernel-mode security protections. This flaw operates at the intersection of kernel-mode hooking mechanisms and user-space memory manipulation, creating a pathway for privilege escalation attacks that bypass traditional security controls. The vulnerability specifically targets the timing window during which kernel-mode hook handlers execute, allowing malicious actors to exploit this temporal gap to circumvent security measures that would normally block dangerous code execution.
The technical implementation of this vulnerability relies on what is commonly referred to as an argument-switch attack or KHOBE (Kernel Hook Obfuscation Exploitation) technique. During the execution of kernel-mode hook handlers, attackers can manipulate user-space memory contents in a manner that effectively switches the arguments or context being processed by the hook handler. This manipulation occurs within the narrow time window when the hook handler is actively processing, allowing the malicious code to execute with elevated privileges while remaining undetected by signature-based malware detection systems. The vulnerability exploits a fundamental timing issue where the hook handler's execution context becomes compromised due to concurrent user-space memory modifications.
From an operational impact perspective, this vulnerability creates a severe security degradation that allows local users to bypass critical kernel-mode protections designed to prevent malicious code execution. The attack vector specifically targets systems where Blink Professional is installed, making it particularly concerning for enterprise environments where such software might be deployed. The ability to execute dangerous code that would otherwise be blocked by handlers but not detected by signature-based systems creates a stealthy attack method that can persist undetected while gaining elevated privileges. This vulnerability essentially provides a backdoor mechanism that undermines the entire kernel-mode protection architecture.
Security practitioners should note that this vulnerability aligns with several ATT&CK framework techniques including privilege escalation through kernel hooking manipulation and defense evasion via obfuscation techniques. The issue demonstrates the complexity of modern exploit development where attackers target the timing and execution flow of security mechanisms rather than direct system vulnerabilities. The disputed nature of this vulnerability highlights the nuanced debate within the security community about what constitutes a legitimate security flaw versus a design limitation in protection mechanisms. Organizations should implement comprehensive monitoring for anomalous memory access patterns and kernel hooking activities. Mitigation strategies should include immediate software updates, implementation of advanced behavioral monitoring, and regular security assessments of kernel-mode protection systems.
The vulnerability's classification under CWE categories related to race conditions and improper handling of kernel-mode security mechanisms demonstrates the complexity of modern exploit development. The fact that this attack bypasses both kernel-mode hook handlers and signature-based detection systems creates a particularly dangerous threat vector that requires layered defensive approaches. Organizations should consider implementing additional security controls beyond traditional antivirus solutions, including kernel-mode integrity checking, memory protection mechanisms, and comprehensive endpoint detection and response capabilities to address such sophisticated attack techniques.