CVE-2010-1887 in Windows
Summary
by MITRE
The Windows kernel-mode drivers in win32k.sys in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 do not properly validate an unspecified system-call argument, which allows local users to cause a denial of service (system hang) via a crafted application, aka "Win32k Bounds Checking Vulnerability."
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Analysis
by VulDB Data Team • 09/22/2021
The vulnerability identified as CVE-2010-1887 represents a critical bounds checking flaw within the Windows kernel-mode drivers of multiple operating system versions. This issue specifically affects the win32k.sys component which serves as the kernel-mode driver for the Windows graphical subsystem, responsible for managing windowing operations and user interface elements. The vulnerability stems from improper validation of system-call arguments within the kernel-mode context, creating a potential attack surface that adversaries can exploit to disrupt system operations. The flaw affects a broad range of Microsoft Windows operating systems including Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, as well as Windows 7, making it particularly concerning for enterprise environments with diverse operating system deployments.
The technical nature of this vulnerability involves a bounds checking failure that occurs when the win32k.sys driver processes specific system calls. This type of flaw typically arises when kernel-mode code fails to properly validate input parameters before processing them, leading to potential memory corruption or system instability. The unspecified system-call argument mentioned in the vulnerability description suggests that the flaw occurs during the handling of certain graphical or user interface related system calls that the driver receives from user-mode applications. This particular vulnerability falls under the CWE-129 category of "Improper Validation of Array Index" and represents a classic example of a buffer overflow or bounds checking vulnerability that can be exploited to cause system instability. The vulnerability's classification aligns with ATT&CK technique T1068 which describes 'Exploitation for Privilege Escalation' and T1499 which covers 'Endpoint Denial of Service' attacks.
The operational impact of this vulnerability manifests primarily as a denial of service condition that can cause system hangs or complete system crashes. Local users who can execute malicious applications have the capability to trigger this vulnerability through crafted system calls that exploit the improper bounds checking in the win32k.sys driver. The attack requires local system access, meaning an attacker must already have user-level privileges on the target system to exploit this vulnerability, but the impact can be severe as it can cause complete system instability and require manual intervention to restore normal operations. The vulnerability's potential for causing system hangs makes it particularly dangerous in enterprise environments where system uptime is critical, as it can lead to service disruptions that affect productivity and business operations. The fact that this vulnerability affects multiple Windows versions indicates a widespread exposure that makes it attractive to attackers seeking to exploit systems across different environments.
Mitigation strategies for CVE-2010-1887 should focus on both immediate defensive measures and long-term remediation approaches. Microsoft has released security updates that address this vulnerability through patches to the win32k.sys driver and associated kernel components. Organizations should prioritize applying these security updates immediately to protect their systems from exploitation. Additionally, implementing application whitelisting policies can help prevent malicious applications from executing on systems, reducing the attack surface for this type of vulnerability. System administrators should also consider implementing monitoring solutions that can detect unusual system behavior patterns that may indicate exploitation attempts. The vulnerability's classification as a kernel-mode issue means that traditional user-mode security controls may not be sufficient, requiring more comprehensive system hardening approaches. Regular vulnerability assessments and security audits should be conducted to identify systems that may be running unpatched versions of affected operating systems, particularly in legacy environments where automatic updates may not be enabled. Given the nature of kernel-mode vulnerabilities, organizations should also consider implementing additional security controls such as kernel patch protection and system integrity monitoring to prevent exploitation attempts.