CVE-2011-0238 in Safari
Summary
by MITRE
WebKit, as used in Apple Safari before 5.0.6, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site, a different vulnerability than other WebKit CVEs listed in APPLE-SA-2011-07-20-1.
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Analysis
by VulDB Data Team • 01/19/2025
The vulnerability identified as CVE-2011-0238 represents a critical memory corruption flaw within WebKit engine components that were integrated into Apple Safari browser versions prior to 5.0.6. This vulnerability operates through a sophisticated attack vector that leverages maliciously crafted web content to exploit fundamental memory management mechanisms within the browser's rendering engine. The flaw specifically targets the way WebKit processes certain web page elements, creating conditions where attacker-controlled data can corrupt memory structures and potentially execute arbitrary code. This type of vulnerability falls under the CWE-119 category of "Improper Access to Memory Location" and represents a classic buffer overflow or memory corruption issue that has been historically prevalent in browser engine implementations.
The technical exploitation of this vulnerability occurs when a user visits a malicious website that contains specially crafted HTML, JavaScript, or CSS elements designed to trigger the memory corruption condition. WebKit's JavaScript engine and rendering components interact with these malformed elements in ways that bypass normal memory protection mechanisms, allowing attackers to manipulate heap memory or stack structures. The memory corruption can manifest in multiple ways including heap corruption, stack smashing, or use-after-free conditions that ultimately result in either code execution or application crash. This vulnerability demonstrates the inherent complexity of modern browser engines where multiple subsystems must interact seamlessly while maintaining memory safety across diverse input sources. The attack surface is particularly concerning because it requires no user interaction beyond visiting a malicious page, making it a prime candidate for drive-by download attacks and automated exploitation campaigns.
The operational impact of CVE-2011-0238 extends beyond simple application instability to encompass significant security risks for end users. When successfully exploited, this vulnerability can enable attackers to execute arbitrary code with the privileges of the browser process, potentially leading to complete system compromise. The memory corruption can result in denial of service conditions that make the browser unusable, but more critically, the same memory corruption patterns that cause crashes can also be leveraged to achieve code execution through techniques such as return-oriented programming or just-in-time compilation exploitation. This vulnerability represents a classic example of how browser engine flaws can be weaponized to bypass security boundaries that normally protect users from malicious content. The vulnerability's impact is particularly severe in enterprise environments where Safari is widely used and where a successful exploit could provide attackers with access to sensitive corporate data or serve as a foothold for broader network infiltration activities.
Mitigation strategies for this vulnerability require immediate patching of affected Safari installations to version 5.0.6 or later, which contains the necessary memory safety fixes and code modifications to prevent the exploitation conditions. System administrators should implement comprehensive browser update policies and consider deploying automated patch management solutions to ensure rapid deployment of security fixes. The vulnerability highlights the importance of maintaining up-to-date browser software and demonstrates how even seemingly minor memory corruption issues can have major security implications. Organizations should also implement web filtering solutions and browser hardening measures including sandboxing and content security policies to reduce the effectiveness of potential exploitation attempts. This vulnerability serves as a reminder of the critical need for continuous security monitoring and rapid response capabilities in addressing browser-based attack vectors. The remediation process should include verification that the patch has been properly installed and that no legacy browser versions remain in use, as the vulnerability may persist in older installations that have not been updated.