CVE-2009-1511 in Windows
Summary
by MITRE
GDI+ in Microsoft Windows XP SP3 allows remote attackers to cause a denial of service (infinite loop) via a PNG file that contains a certain large btChunkLen value.
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Analysis
by VulDB Data Team • 11/27/2024
The vulnerability described in CVE-2009-1511 represents a critical denial of service flaw within the Graphics Device Interface plus component of Microsoft Windows XP Service Pack 3. This issue specifically affects how the system processes Portable Network Graphics files, which are widely used image formats that can be embedded in various digital media and web applications. The vulnerability stems from insufficient input validation within the GDI+ image processing pipeline, creating a scenario where maliciously crafted PNG files can trigger unexpected system behavior.
The technical flaw manifests when a PNG file contains an unusually large btChunkLen value, which represents the length field in the PNG chunk structure. This value, when excessively large, causes the GDI+ processing engine to enter an infinite loop during the parsing phase of the image file. The chunk length field in PNG format is designed to indicate the size of data contained within each chunk, but the vulnerability exploits the lack of proper bounds checking on this value. When the system attempts to process this malformed chunk, it continuously iterates through a loop that never terminates, consuming excessive CPU resources and effectively rendering the affected system unavailable to legitimate users.
The operational impact of this vulnerability extends beyond simple system unavailability, as it can be exploited remotely through various attack vectors including web browsing, email attachments, or file sharing mechanisms. An attacker could craft a malicious PNG file and distribute it through compromised websites, email systems, or file transfer protocols, leading to widespread denial of service across multiple Windows XP systems. The infinite loop consumes system resources continuously, potentially causing system crashes, application failures, or complete system lockups that require manual intervention to resolve. This vulnerability particularly affects systems running Windows XP SP3, which was still widely deployed in enterprise environments during the time of this vulnerability's discovery.
Security professionals should consider this vulnerability in the context of CWE-129, which addresses improper validation of length fields in input data processing, and aligns with ATT&CK technique T1499.100, which covers network denial of service attacks through resource exhaustion. Organizations should implement immediate mitigations including network segmentation, web application firewalls, and strict file type validation for image uploads. The recommended approach involves disabling automatic image rendering for untrusted content, implementing strict file size limits, and deploying patch management procedures to ensure all systems receive the appropriate security updates. Additionally, monitoring for unusual CPU usage patterns and implementing intrusion detection systems can help identify exploitation attempts before they cause significant system disruption.