CVE-2018-8873 in Security Guard
Summary
by MITRE
In 2345 Security Guard 3.6, the driver file (2345NetFirewall.sys) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0x00222040.
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Analysis
by VulDB Data Team • 01/15/2020
The vulnerability identified as CVE-2018-8873 affects the 2345 Security Guard 3.6 software suite, specifically targeting the kernel-mode driver component known as 2345NetFirewall.sys. This driver operates at the privileged kernel level and serves as a critical security component responsible for network traffic filtering and firewall operations. The flaw manifests within the driver's handling of input validation for a specific IOCTL (Input/Output Control) command identified as 0x00222040, which represents a well-defined interface for communication between user-mode applications and kernel-mode drivers in windows operating systems.
The technical root cause of this vulnerability lies in the absence of proper input validation mechanisms within the driver's IOCTL handling routine. When a local user process sends data to the driver through this specific IOCTL command, the driver fails to validate the incoming parameters before processing them. This validation gap creates an opportunity for malicious input to be passed directly to kernel memory operations, potentially leading to system instability. The lack of input sanitization and parameter checking represents a classic example of improper input validation, which is categorized under CWE-20 in the Common Weakness Enumeration framework. This weakness allows attackers to manipulate driver behavior through crafted input sequences that could trigger unexpected execution paths within the kernel.
The operational impact of this vulnerability extends beyond simple denial of service conditions, though the primary effect manifests as a blue screen of death (BSOD) that completely halts system operation. Local users with minimal privileges can exploit this vulnerability to crash the operating system, effectively rendering the machine unusable until manual reboot occurs. However, the description mentions the possibility of unspecified other impacts, suggesting that the vulnerability might potentially enable more sophisticated attacks beyond simple system crashes. The kernel-mode execution context of the driver means that successful exploitation could potentially provide attackers with elevated privileges or enable privilege escalation attacks. This vulnerability particularly affects systems running Windows operating systems where the 2345 Security Guard software is installed, creating a persistent threat vector for local attackers who can leverage the driver's privileges to compromise system integrity.
Mitigation strategies for CVE-2018-8873 should focus on immediate remediation through vendor-provided patches and updates. System administrators should prioritize installing the latest security updates from 2345 Technologies to address this vulnerability. Additionally, implementing defensive measures such as driver signature enforcement and kernel-mode protection mechanisms can help prevent exploitation attempts. The vulnerability aligns with several ATT&CK techniques including privilege escalation through kernel exploits and defense evasion via system crash generation. Organizations should consider implementing process monitoring to detect unusual IOCTL activity patterns and establish network segmentation to limit potential lateral movement. The vulnerability also highlights the importance of proper kernel driver security practices, emphasizing the need for comprehensive input validation and parameter checking in all kernel-mode components to prevent similar issues from occurring in other security software implementations.