CVE-2009-1808 in Windows
Summary
by MITRE
Microsoft Windows XP SP3 allows local users to cause a denial of service (system crash) by making an SPI_SETDESKWALLPAPER SystemParametersInfo call with an improperly terminated pvParam argument, followed by an SPI_GETDESKWALLPAPER SystemParametersInfo call.
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Analysis
by VulDB Data Team • 11/01/2025
This vulnerability exists in Microsoft Windows XP Service Pack 3 and represents a classic buffer overflow condition that manifests through improper handling of system parameters. The flaw occurs within the Windows SystemParametersInfo API function when processing wallpaper-related parameters, specifically when the pvParam argument lacks proper string termination. The vulnerability exploits the difference in how the system handles SPI_SETDESKWALLPAPER and SPI_GETDESKWALLPAPER calls, creating a condition where an improperly formatted string parameter can trigger memory corruption. This type of vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and demonstrates the dangerous consequences of inadequate input validation in system-level APIs. The issue is particularly concerning because it allows local users to execute arbitrary code or cause system instability through seemingly benign system parameter manipulation.
The technical execution of this vulnerability requires a local attacker to first make an SPI_SETDESKWALLPAPER call with a maliciously formatted pvParam argument that contains a string without proper null termination. This creates a memory state where subsequent SPI_GETDESKWALLPAPER calls can access uninitialized memory or corrupted data structures. The vulnerability operates at the kernel level within Windows system services, making it particularly dangerous as it can lead to complete system crashes or potential privilege escalation. The attack vector is classified as local privilege escalation due to the requirement for user-level access to execute the malicious API calls, though the impact extends to system stability and availability. This vulnerability aligns with ATT&CK technique T1068 which covers local privilege escalation through system API manipulation.
The operational impact of CVE-2009-1808 extends beyond simple denial of service, as it can be leveraged to create persistent system instability that may require complete system reinstallation. When exploited successfully, the vulnerability causes the Windows graphical subsystem to crash, resulting in system lockups and potential data loss. The vulnerability affects all Windows XP systems running SP3 and represents a critical weakness in the Windows API parameter validation mechanisms. Organizations with legacy Windows XP deployments face significant risk from this vulnerability, as it can be exploited by malicious software or by local attackers who have already gained user-level access to the system. The vulnerability's exploitation does not require administrative privileges, making it particularly dangerous in multi-user environments where local access is common.
Mitigation strategies for this vulnerability should include immediate deployment of Microsoft security patches, which address the underlying buffer handling issues in the SystemParametersInfo API. System administrators should implement strict access controls to limit local user privileges and monitor for suspicious API call patterns that may indicate exploitation attempts. The vulnerability highlights the importance of proper input validation and memory management in system APIs, particularly those that handle user-provided data. Organizations should also consider implementing application whitelisting policies to restrict potentially malicious software from executing on affected systems. Regular system updates and patch management processes are essential to prevent exploitation of similar vulnerabilities, as this represents a common pattern of memory corruption issues that can be addressed through proper code review and testing procedures. The vulnerability serves as a reminder of the critical need for robust security practices in system-level programming and the importance of adhering to secure coding standards that prevent buffer overflows and memory corruption conditions.