CVE-2025-0611 refers to a security vulnerability that affects Google Chrome versions before 132..6834.110. A remote attacker can potentially exploit this weakness by causing heap corruption through a crafted HTML page. In this post, we will dive into the details of this vulnerability, explore the exploit, and learn how to prevent such attacks.
Background Info
This vulnerability originates from an object corruption issue in V8, which is Google Chrome's JavaScript engine. Chrome relies on V8 to interpret and execute JavaScript code from websites. In specific cases, an attacker can trigger heap corruption by manipulating memory objects in V8 through a specially designed HTML page, which could lead to potential exploitation for various malicious purposes.
Understanding V8 Object Corruption
To understand the root cause of this vulnerability, let's first take a look at a high-level view of how V8 manages memory objects:
// Pseudo code for creating a simple JavaScript object in V8
Object obj = new Object();
// Assigning a property to the object
obj.property = "value";
V8 is designed to manage objects efficiently, with a complex system in place to handle memory allocation, garbage collection, and property storage. In certain cases, a bug in the V8 engine can cause these property assignments to create an incorrect object layout, leading to memory corruption.
Exploit Details
The actual vulnerability was discovered within the code that deals with property assignments for objects. Here's a simplified snippet of the vulnerable code:
// Pseudo code illustrating the bug in V8 property assignment
// Allocate new property cell
PropertyCell* cell = allocator.allocate();
// Assign the value to the cell
cell->set_value(value);
// Add the cell to object's properties storage
object->properties.add(cell);
During the process of assigning a property to a JavaScript object, the V8 engine would sometimes fail to update the object's layout correctly, causing heap corruption. This could result in an attacker gaining unauthorized access to read or write portions of the browser's memory, which could be exploited for various purposes, such as:
To exploit this vulnerability, an attacker could create a crafted HTML page as follows
<!doctype html>
<html>
<head>
<title>Exploit for CVE-2025-0611</title>
<script>
// Malicious JavaScript code exploiting the vulnerability
...
</script>
</head>
<body>
...
</body>
</html>
When a user visits this website using a vulnerable version of Google Chrome, the malicious JavaScript code would execute and potentially exploit the heap corruption.
Prevention
To protect against exploitation of this vulnerability, users should update Google Chrome to version 132..6834.110 or higher. The patch issued by the Chromium team fixes the object corruption issue in V8 by ensuring that the property assignments correctly update the object layout, thus preventing heap corruption.
Conclusion
CVE-2025-0611 highlights the need for browser vendors to be vigilant about potential security vulnerabilities in their products. It also emphasizes the importance of users keeping their software up-to-date with the latest security patches. Regularly updating your software and being mindful of the websites you visit will minimize the risk of such attacks in the future.
For in-depth details on this vulnerability, please visit the following sources
1. Google Chrome's Release Notes
[Chromium Issue Tracker]()
Timeline
Published on: 01/22/2025 20:15:30 UTC
Last modified on: 02/06/2025 22:15:40 UTC