CVE-2022-0795 in Edge
Summary
by MITRE • 04/05/2022
Type confusion in Blink Layout in Google Chrome prior to 99.0.4844.51 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
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Analysis
by VulDB Data Team • 04/05/2022
This vulnerability represents a type confusion flaw within the Blink layout engine of Google Chrome, specifically affecting versions prior to 99.0.4844.51. The issue stems from improper handling of object types during JavaScript execution, creating conditions where memory operations can inadvertently access or modify data structures with mismatched expectations. Such type confusion vulnerabilities typically arise when the application fails to properly validate or enforce type boundaries during dynamic object manipulation, leading to unpredictable behavior and potential exploitation opportunities.
The technical implementation of this vulnerability occurs within Chrome's rendering pipeline where Blink processes HTML and JavaScript content. When a maliciously crafted HTML page is loaded, it can trigger specific code paths that cause objects to be treated as different types than their actual memory representations. This misalignment enables attackers to manipulate heap memory in ways that should not be possible under normal execution conditions. The flaw specifically impacts the layout engine's object management system where type information is either improperly validated or cached incorrectly, allowing for memory corruption through controlled input manipulation.
From an operational perspective, this vulnerability creates significant risk for remote code execution capabilities when exploited. Attackers can craft HTML pages that, when viewed in affected Chrome versions, trigger the type confusion condition leading to heap corruption. The exploitation process typically involves careful manipulation of JavaScript objects and DOM elements to force the browser into executing malicious memory operations. This allows adversaries to potentially execute arbitrary code with the privileges of the browser user, bypassing standard security boundaries and potentially leading to full system compromise.
The vulnerability aligns with CWE-468, which specifically addresses "Improper Use of a Computed Value" in type confusion scenarios, and maps to ATT&CK technique T1059.007 for JavaScript-based execution. Organizations should immediately update to Chrome version 99.0.4844.51 or later to remediate this issue, as the patch addresses the underlying type validation mechanisms within Blink's layout engine. Additional mitigations include implementing strict content security policies and enabling sandboxing features where available, though these measures provide only partial protection against sophisticated exploitation attempts. Security teams should monitor for any reported exploitation attempts targeting this vulnerability in the wild and ensure comprehensive patch management across all affected systems.