CVE-2012-5129 in Chrome
Summary
by MITRE
Heap-based buffer overflow in the WebGL subsystem in Google Chrome OS before 23.0.1271.94 allows remote attackers to cause a denial of service (GPU process crash) or possibly have unspecified other impact via unknown vectors.
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Analysis
by VulDB Data Team • 04/20/2021
The vulnerability identified as CVE-2012-5129 represents a critical heap-based buffer overflow within the WebGL subsystem of Google Chrome OS, affecting versions prior to 23.0.1271.94. This flaw resides in the graphics processing component that handles WebGL API calls, which are essential for rendering 3D graphics in web browsers without requiring additional plugins. The vulnerability specifically impacts the GPU process that manages WebGL rendering operations, creating a potential pathway for malicious actors to exploit the system's memory management mechanisms.
The technical nature of this buffer overflow stems from improper input validation within the WebGL implementation, where insufficient bounds checking allows attackers to write beyond allocated memory boundaries in the heap. This type of vulnerability falls under CWE-121, heap-based buffer overflow, which is a well-documented weakness in software security that occurs when programs write data beyond the boundaries of heap-allocated buffers. The flaw enables attackers to manipulate memory layout and potentially execute arbitrary code or cause system instability through carefully crafted WebGL content that triggers the overflow condition.
From an operational impact perspective, this vulnerability presents significant risks to Chrome OS users and organizations relying on the platform for security-sensitive operations. The exploit can result in denial of service conditions where the GPU process crashes, rendering graphics functionality unavailable and potentially requiring system restarts. More concerning is the potential for unspecified other impacts that could include privilege escalation, information disclosure, or remote code execution depending on the specific exploitation vectors. The GPU process crash represents a direct threat to system availability and user productivity, particularly in enterprise environments where Chrome OS devices serve as primary workstations.
The exploitation of this vulnerability aligns with ATT&CK technique T1059.007 for process injection and T1203 for exploitation for privilege escalation, as attackers could leverage the heap overflow to gain elevated privileges within the GPU subsystem. The vulnerability affects the broader Chrome OS security model by compromising the isolation between different system processes, particularly between the browser process and the GPU process that handles WebGL rendering. Organizations should prioritize patching this vulnerability as it represents a known exploit vector that could be leveraged by threat actors without requiring specialized knowledge of the system internals.
Mitigation strategies should focus on immediate patch deployment to Chrome OS versions 23.0.1271.94 and later, which contain the necessary memory validation fixes for WebGL operations. Additionally, organizations should implement network monitoring to detect potential exploitation attempts through suspicious WebGL content delivery, and consider implementing browser security policies that restrict WebGL access to trusted domains only. The vulnerability demonstrates the importance of robust memory safety practices in graphics rendering subsystems and highlights the need for continuous security assessment of browser components that handle complex graphics operations. Regular security updates and vulnerability assessments should be maintained to protect against similar heap-based buffer overflow issues that could compromise system integrity and user data confidentiality.