CVE-2023-25358 in WebKitGTK
Summary
by MITRE • 03/02/2023
A use-after-free vulnerability in WebCore::RenderLayer::addChild in WebKitGTK before 2.36.8 allows attackers to execute code remotely.
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Analysis
by VulDB Data Team • 11/30/2025
The vulnerability identified as CVE-2023-25358 represents a critical use-after-free flaw within the WebKitGTK browser engine that affects versions prior to 2.36.8. This issue resides in the WebCore::RenderLayer::addChild function, which is responsible for managing the hierarchical structure of rendered web page elements. The flaw stems from improper memory management practices where freed memory locations are accessed after objects have been deallocated, creating opportunities for malicious code execution. Such vulnerabilities are particularly dangerous because they can be exploited through web-based attacks without requiring user interaction, making them ideal for drive-by download scenarios.
The technical nature of this vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions where software attempts to access memory after it has been freed. This particular flaw occurs during the rendering process when WebKitGTK handles the addition of child layers to parent rendering objects. Attackers can manipulate web content to trigger the vulnerable code path, causing the application to free memory associated with a render layer object and subsequently access that same memory location through a crafted web page. The exploitation typically involves creating specific HTML structures that force the browser engine into a state where the memory management error occurs, potentially leading to arbitrary code execution with the privileges of the affected browser process.
From an operational perspective, this vulnerability poses significant risks to users of WebKitGTK-based applications, including web browsers, email clients, and other software that relies on the WebKit rendering engine. The remote code execution capability means that attackers can deliver malicious payloads through compromised websites or phishing attacks, potentially leading to full system compromise. The vulnerability affects not only individual users but also organizations that depend on WebKitGTK for their web-based applications. Security researchers have noted that the exploitation requires relatively sophisticated techniques due to modern memory protection mechanisms, but successful exploitation can result in complete system control.
Mitigation strategies for CVE-2023-25358 primarily focus on immediate patching of affected WebKitGTK versions to 2.36.8 or later, which includes memory management fixes that prevent the use-after-free condition. System administrators should prioritize updating all WebKitGTK-dependent applications and monitor for any signs of exploitation attempts. Additional protective measures include implementing web application firewalls, content security policies, and restricting access to potentially malicious websites. The vulnerability also highlights the importance of regular security audits and the adoption of modern exploitation prevention techniques such as address space layout randomization and control flow integrity. Organizations should also consider deploying intrusion detection systems to monitor for exploitation patterns and maintain comprehensive incident response procedures to address potential compromises. This vulnerability demonstrates the critical importance of maintaining up-to-date software and the potential consequences of delayed patch management in web browser environments.