CVE-2020-6468 in Chrome
Summary
by MITRE
Type confusion in V8 in Google Chrome prior to 83.0.4103.61 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
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Analysis
by VulDB Data Team • 05/06/2025
The vulnerability identified as CVE-2020-6468 represents a critical type confusion issue within the V8 JavaScript engine that powers Google Chrome. This flaw exists in the engine's handling of object types during runtime execution, creating a scenario where the system incorrectly interprets the data type of memory objects. The vulnerability manifests when Chrome processes specially crafted HTML pages that manipulate object references in ways that bypass normal type checking mechanisms. Such type confusion can lead to unpredictable behavior where memory locations intended for one data type are accessed as another, potentially allowing attackers to manipulate program flow and execute arbitrary code.
The technical implementation of this vulnerability stems from insufficient type validation within V8's memory management subsystem. When the JavaScript engine encounters objects with overlapping memory layouts, it may fail to properly distinguish between different object types, particularly during garbage collection or object reinitialization processes. This condition creates a heap corruption scenario where attackers can craft malicious JavaScript code that forces the engine to treat memory regions as different data types than originally allocated. The flaw operates at the intersection of memory safety and dynamic type systems, where the V8 engine's type detection mechanisms are insufficient to prevent such cross-type memory access patterns. This issue aligns with CWE-128, which specifically addresses signedness errors in type handling, and represents a classic example of heap-based buffer overflow conditions that can be exploited through type confusion attacks.
The operational impact of CVE-2020-6468 extends beyond simple remote code execution to encompass potential privilege escalation and persistent system compromise. Attackers can leverage this vulnerability through web-based delivery methods, requiring no user interaction beyond visiting a malicious webpage. The exploitability is enhanced by the fact that V8's Just-In-Time compilation process creates complex memory layouts that are difficult to predict and validate. This vulnerability can be classified under ATT&CK technique T1059.007 for JavaScript-based attacks and T1070.006 for obfuscation techniques that mask malicious payloads. The attack surface is particularly broad given that Chrome's V8 engine is used across numerous web applications and services, making this a high-value target for threat actors seeking widespread exploitation. Successful exploitation could result in complete system compromise, data theft, or persistent backdoor installation.
Mitigation strategies for this vulnerability primarily focus on immediate browser updates and deployment of patched versions. Organizations should prioritize updating Chrome to version 83.0.4103.61 or later, which includes patches addressing the type confusion in V8's memory management. Additional protective measures include implementing content security policies to restrict script execution, deploying web application firewalls that can detect and block malicious JavaScript patterns, and configuring browser security settings to limit object type manipulation. Network-level protections such as sandboxing mechanisms and strict MIME type checking can provide additional defense layers. The vulnerability also highlights the importance of regular security assessments and vulnerability scanning to identify similar type confusion issues in other JavaScript engines or web frameworks. Organizations should consider implementing automated patch management systems to ensure timely deployment of security updates and maintain comprehensive monitoring for exploitation attempts targeting this and similar vulnerabilities.