CVE-2010-5158 in DefenseWall Personal Firewall
Summary
by MITRE
** DISPUTED ** Race condition in DefenseWall Personal Firewall 3.00 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.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/07/2024
The vulnerability described in CVE-2010-5158 represents a significant race condition within DefenseWall Personal Firewall version 3.00 on Windows XP systems. This flaw operates at the kernel level and specifically targets the firewall's hook handler mechanism, which serves as a critical security control for monitoring and blocking malicious network activity. The vulnerability arises from improper synchronization during the execution of kernel-mode hook handlers, creating a temporal window where malicious code can exploit the system's defenses. According to the description, this race condition enables local users to bypass kernel-mode protections that would normally intercept and block dangerous code execution, effectively undermining the firewall's core security functionality. The attack vector involves user-space memory modifications that occur during the execution of hook handlers, which creates a scenario where the system's defensive mechanisms can be circumvented through carefully timed memory operations.
The technical exploitation of this vulnerability falls under the category of kernel-mode attacks that leverage timing discrepancies in system protection mechanisms. This particular flaw demonstrates characteristics consistent with KHOBE (Kernel Hook Obfuscation and Exploitation) attacks, where attackers manipulate the execution flow of kernel code to bypass security controls. The vulnerability operates through what is essentially an argument-switch attack pattern, where malicious code modifies memory structures during hook handler execution to alter the behavior of security mechanisms. This type of attack directly relates to CWE-362, which describes race conditions in concurrent systems, and specifically targets the improper synchronization between user-space and kernel-space operations. The attack's effectiveness stems from the fact that it operates during the execution of legitimate security mechanisms, making it particularly difficult to detect and prevent through traditional signature-based malware detection methods.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises the integrity of the system's kernel-mode protection framework. Local attackers who successfully exploit this race condition can execute arbitrary code that would normally be blocked by the firewall's kernel-mode hook handlers, creating a persistent security threat that operates below the detection capabilities of standard endpoint protection solutions. This vulnerability represents a critical failure in the security architecture of DefenseWall Personal Firewall, as it allows attackers to bypass the very mechanisms designed to protect against malicious network activity. The implications are particularly severe given that this attack can be executed by local users without requiring elevated privileges, effectively transforming the firewall from a protective barrier into a potential attack vector. The fact that this vulnerability can bypass signature-based detection mechanisms further compounds the risk, as it operates through techniques that are difficult to identify through conventional security monitoring approaches.
The disputed nature of this vulnerability stems from the fundamental question of whether such an attack scenario represents a legitimate security flaw or merely an exploitation of circumstances where malicious code has already begun executing. Third-party analysts have questioned whether this represents a true vulnerability in the protection mechanism or simply an artifact of the specific conditions under which the attack occurs. However, from a cybersecurity perspective, the vulnerability remains significant because it demonstrates the potential for kernel-mode protection bypasses that can be exploited by local attackers to circumvent security controls. The attack's reliance on user-space memory manipulation during kernel execution highlights a broader class of vulnerabilities in operating system security models where insufficient synchronization between different execution contexts can create exploitable gaps. Mitigation efforts should focus on strengthening kernel-mode synchronization mechanisms and implementing more robust protection against memory manipulation attacks, while also considering the broader implications for kernel security architecture design. This vulnerability serves as a reminder of the critical importance of proper synchronization in security-critical kernel components and the need for comprehensive testing of protection mechanisms under various attack scenarios. The issue also aligns with ATT&CK technique T1068, which covers local privilege escalation through kernel exploits, and demonstrates how seemingly minor synchronization flaws can result in significant security breaches that compromise system integrity.