CVE-2018-6065 in Chrome
Summary
by MITRE
Integer overflow in computing the required allocation size when instantiating a new javascript object in V8 in Google Chrome prior to 65.0.3325.146 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
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Analysis
by VulDB Data Team • 01/29/2025
The vulnerability identified as CVE-2018-6065 represents a critical integer overflow condition within the V8 JavaScript engine used by Google Chrome prior to version 65.0.3325.146. This flaw occurs during the process of computing memory allocation sizes when creating new JavaScript objects, specifically affecting the memory management subsystem that handles dynamic object instantiation. The vulnerability falls under the category of memory safety issues and is particularly dangerous because it can lead to heap corruption, which forms the foundation for numerous remote exploitation techniques.
The technical implementation of this vulnerability stems from improper handling of integer arithmetic when calculating memory requirements for JavaScript object instantiation. When the V8 engine processes JavaScript code that creates objects with potentially large or maliciously crafted size parameters, the integer overflow occurs during the calculation of required memory allocation. This overflow results in a smaller allocation size than actually needed, creating a situation where subsequent memory operations can overwrite adjacent memory regions. The flaw is particularly insidious because it leverages the normal operation of JavaScript object creation to achieve memory corruption, making it difficult to distinguish between legitimate and malicious code execution paths.
The operational impact of CVE-2018-6065 extends far beyond simple memory corruption, as it provides remote attackers with a potential pathway to execute arbitrary code on affected systems. The heap corruption vulnerability can be exploited through crafted HTML pages delivered via web browsers, making it particularly dangerous in the context of web-based attacks. Attackers can leverage this vulnerability to perform privilege escalation, execute malicious payloads, or gain unauthorized access to user systems. The vulnerability's remote exploitability means that users do not need to take any special actions to be at risk, as simply visiting a malicious webpage can trigger the exploitation sequence. This makes the vulnerability particularly concerning for enterprise environments and users who browse the internet regularly.
The security implications of this vulnerability align with CWE-190, which specifically addresses integer overflow conditions that can lead to memory corruption. The flaw also corresponds to techniques described in the ATT&CK framework under the T1059.007 sub-technique for JavaScript-based attacks, where adversaries leverage browser-based scripting languages to execute malicious code. Mitigation strategies should include immediate patching of Chrome installations to version 65.0.3325.146 or later, which contains the necessary fixes for the integer overflow handling. Additionally, organizations should implement browser hardening measures, including sandboxing mechanisms, content security policies, and regular security updates to prevent exploitation of similar vulnerabilities. Network-based protections such as web application firewalls and intrusion detection systems can also help detect and block exploitation attempts targeting this vulnerability.