CVE-2025-30427 - Use-After-Free Vulnerability in Safari Causing Unexpected Crashes Resolved with Improved Memory Management

A new security vulnerability, identified as CVE-2025-30427, has been discovered that affects Safari browser. This vulnerability is a result of a use-after-free issue, which essentially refers to accessing memory after it has been freed. This can cause corruption of valid data, crash the application, or even lead to code execution. An attacker could exploit this vulnerability by crafting malicious web content, which, when processed, may lead to an unexpected Safari crash. This vulnerability has been addressed with improved memory management and has been fixed in visionOS 2.4, tvOS 18.4, iPadOS 17.7.6, iOS 18.4 and iPadOS 18.4, macOS Sequoia 15.4, and Safari 18.4.

Code Snippet

In the following code snippet, a use-after-free vulnerability can be observed. Consider the following JavaScript sample code:

// Vulnerable code snippet
var obj = { prop: "value" };
doSomethingWith(obj);
delete obj;

// Later in the code...
doSomethingElseWith(obj);

In this example, the obj variable is created, passed to a function, then immediately deleted. However, later in the code, the obj variable is used again, causing a use-after-free vulnerability.

Exploit Details

An attacker could exploit the CVE-2025-30427 vulnerability by creating a specially crafted webpage that contains malicious JavaScript code, such as the one in our example. When an unsuspecting user visits the malicious webpage using Safari browser, the malicious code would trigger the use-after-free issue, resulting in an unexpected crash of the browser.

For specific details of the exploit, please refer to the original CVE Reference

CVE-2025-30427 - Information and Details

Fix:

To fix this vulnerability, users are advised to update their devices to the latest versions listed above. For guidance on updating your devices, please refer to the following resources:

- How to update your iPhone, iPad, or iPod touch
- Update tvOS on your Apple TV
- Update software on your Mac

Conclusion

CVE-2025-30427 is a use-after-free issue that can cause an unexpected crash in Safari when processing malicious web content, potentially putting user's data and privacy at risk. Keeping devices up to date is crucial in addressing these vulnerabilities and ensuring user safety. Users should always update their devices to the latest available versions to stay protected against such security issues.

Timeline

Published on: 03/31/2025 23:15:25 UTC
Last modified on: 04/01/2025 20:26:22 UTC