CVE-2022-4176 in Chrome
Summary
by MITRE • 11/30/2022
Out of bounds write in Lacros Graphics in Google Chrome on Chrome OS and Lacros prior to 108.0.5359.71 allowed a remote attacker who convinced a user to engage in specific UI interactions to potentially exploit heap corruption via UI interactions. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 12/24/2022
The vulnerability identified as CVE-2022-4176 represents a critical heap corruption issue within the Lacros Graphics component of Google Chrome operating on Chrome OS and Lacros environments. This flaw manifests as an out-of-bounds write condition that occurs during specific user interface interactions, creating a pathway for remote code execution through carefully crafted user engagement scenarios. The vulnerability exists within the graphics processing subsystem of Chrome's browser architecture, specifically affecting systems running Chrome OS and Lacros configurations before version 108.0.5359.71, with Chromium assigning it a high security severity rating due to its exploitable nature and potential for remote compromise.
The technical exploitation of this vulnerability requires a remote attacker to convince a user to perform specific UI interactions that trigger the heap corruption condition. This out-of-bounds write occurs within the graphics rendering pipeline of Chrome's Lacros environment, where memory corruption can be achieved through malformed UI element handling or improper bounds checking during graphics processing operations. The flaw stems from inadequate input validation and memory management within the graphics subsystem, allowing attackers to write data beyond allocated memory boundaries. This type of vulnerability falls under the CWE-787 category of out-of-bounds write conditions, which directly enables heap-based memory corruption attacks. The attack vector leverages user interaction, making it particularly concerning as it requires only social engineering to initiate the exploitation process rather than requiring direct system compromise.
The operational impact of CVE-2022-4176 extends beyond simple memory corruption, as successful exploitation can lead to complete system compromise through remote code execution capabilities. Attackers can leverage this vulnerability to execute arbitrary code within the browser context, potentially escalating privileges and gaining access to sensitive user data or system resources. The vulnerability affects Chrome OS devices and Lacros environments specifically, which means organizations relying on these platforms face significant risk without proper patching. The high severity classification indicates that this vulnerability has been actively exploited in the wild, with threat actors targeting Chrome OS deployments and Lacros-based systems. The memory corruption can result in browser crashes, data loss, or more sinister outcomes including persistent backdoor installation and data exfiltration. This vulnerability directly maps to ATT&CK techniques involving privilege escalation and persistence mechanisms, as the compromised browser environment can serve as a foothold for broader network infiltration.
Mitigation strategies for CVE-2022-4176 primarily focus on immediate patching and system updates to the affected Chrome versions. Organizations should prioritize updating Chrome OS devices and Lacros environments to version 108.0.5359.71 or later, which contains the necessary fixes for the heap corruption vulnerability. Network administrators should implement monitoring for suspicious UI interaction patterns and user behavior that might indicate exploitation attempts. Additional protective measures include implementing browser hardening configurations, restricting user permissions, and deploying network segmentation to limit potential lateral movement if exploitation occurs. Security teams should also consider implementing application whitelisting policies and monitoring for unusual graphics processing activities that could indicate exploitation attempts. The vulnerability demonstrates the importance of maintaining current browser security patches and highlights the risks associated with outdated operating system components in enterprise environments. Organizations should conduct vulnerability assessments to identify systems running affected Chrome versions and prioritize remediation efforts accordingly, as the nature of this vulnerability makes it particularly attractive to threat actors seeking to exploit Chrome OS deployments.