CVE-2010-2031 in Webshield
Summary
by MITRE
KAVSafe.sys 2010.4.14.609 and earlier, as used in Kingsoft Webshield 3.5.1.2 and earlier, allows local users to overwrite arbitrary kernel memory via a crafted request to IOCTL 0x830020d4 on the KAVSafe device.
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Analysis
by VulDB Data Team • 02/05/2019
The vulnerability identified as CVE-2010-2031 represents a critical kernel-mode memory corruption issue within the KAVSafe.sys driver component of Kingsoft Webshield security software. This flaw exists in versions 2010.4.14.609 and earlier, affecting Kingsoft Webshield 3.5.1.2 and earlier versions, creating a significant attack surface that could be exploited by local malicious actors. The vulnerability specifically manifests through improper input validation within the driver's handling of IOCTL (Input/Output Control) requests, particularly when processing the specific IOCTL code 0x830020d4 directed at the KAVSafe device.
The technical exploitation of this vulnerability occurs through a carefully crafted IOCTL request that bypasses normal kernel memory protection mechanisms. When the vulnerable driver receives this specific IOCTL command, it fails to properly validate the input parameters or buffer boundaries, allowing an attacker to manipulate kernel memory locations directly. This type of vulnerability falls under the CWE-121 category of Stack-based Buffer Overflow, though it specifically targets kernel memory rather than user-space buffers, making it particularly dangerous. The flaw enables arbitrary kernel memory overwrite operations that can be leveraged to execute arbitrary code with kernel privileges, effectively compromising the entire system's security posture.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it provides attackers with direct access to kernel memory spaces that control critical system functions. Local attackers who can execute code on the target system can use this vulnerability to bypass security controls, modify system integrity checks, or even install rootkits that operate at the kernel level. The implications are severe because kernel-level access allows complete system compromise, enabling attackers to manipulate system calls, modify security policies, and potentially establish persistent backdoors. This vulnerability directly aligns with ATT&CK technique T1055 for Process Injection and T1068 for Exploitation for Privilege Escalation, as it provides a direct path for local users to gain elevated privileges.
Mitigation strategies for this vulnerability require immediate patching of the affected Kingsoft Webshield software to version 3.5.1.3 or later, which contains the necessary fixes for the IOCTL handling routines. System administrators should also implement additional security controls including kernel-mode driver signature enforcement, disabling unnecessary kernel drivers, and monitoring for suspicious IOCTL activity. The vulnerability demonstrates the importance of proper input validation in kernel-mode drivers and highlights the need for thorough security testing of device drivers before deployment. Organizations should conduct comprehensive vulnerability assessments to identify other potentially vulnerable kernel components and ensure that all security software undergoes rigorous testing for memory safety issues. Additionally, implementing least privilege principles and monitoring for unauthorized driver installations can help reduce the attack surface and limit the potential impact of similar vulnerabilities in the future.