CVE-2018-6788 in Jiangmin
Summary
by MITRE
In Jiangmin Antivirus 16.0.0.100, the driver file (KVFG.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 0x2208C0.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 01/02/2020
The vulnerability identified as CVE-2018-6788 affects Jiangmin Antivirus version 16.0.0.100 and represents a critical security flaw within the kernel-mode driver component KVFG.sys. This driver implements an IOCTL handler for the specific control code 0x2208C0 which fails to properly validate input parameters received from user-mode applications. The absence of input validation creates a pathway for malicious code execution or system instability through improper handling of device control requests. The vulnerability manifests as a potential blue screen of death (BSOD) condition, indicating severe system-level impact that can render the affected system unusable.
From a technical perspective, the flaw resides in the driver's failure to implement proper parameter validation mechanisms when processing IOCTL requests. This type of vulnerability aligns with CWE-129, Input Validation, and CWE-754, Improper Check for Unusual or Exceptional Conditions, as the driver does not adequately sanitize or verify the data it receives through the device control interface. The IOCTL 0x2208C0 represents a specific communication channel between user-mode applications and kernel-mode drivers, and the lack of validation at this interface creates an attack surface where malicious input can trigger unexpected behavior in the kernel context.
The operational impact of this vulnerability extends beyond simple denial of service scenarios. Local users with minimal privileges can potentially exploit this weakness to cause system crashes or more serious consequences depending on the nature of the malformed input. The unspecified other impacts mentioned in the description suggest that the vulnerability might enable privilege escalation or information disclosure, though the exact scope remains unclear without additional analysis. This type of vulnerability directly impacts the system's integrity and availability, creating potential for persistent disruption of security services provided by the antivirus software itself.
Security practitioners should consider this vulnerability in the context of the ATT&CK framework, specifically under the T1068 - Exploitation for Privilege Escalation and T1490 - Inhibit System Recovery categories. The vulnerability represents a kernel-level attack vector that could be leveraged by attackers to compromise system integrity and potentially establish persistent access. Organizations should implement immediate mitigations including driver signature enforcement, disabling unnecessary kernel-mode components, and monitoring for suspicious IOCTL activity. Additionally, the vulnerability highlights the importance of proper kernel-mode security practices and the necessity of robust input validation in device drivers to prevent exploitation scenarios that could lead to complete system compromise.