CVE-2011-0234 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 • 11/15/2021
The vulnerability described in CVE-2011-0234 represents a critical memory corruption flaw within WebKit's JavaScript engine that affected Apple Safari versions prior to 5.0.6. This vulnerability falls under the category of remote code execution exploits, where malicious actors could craft specially designed web pages to compromise affected systems. The flaw specifically resides in how WebKit handles certain JavaScript operations, creating conditions that lead to unpredictable memory behavior and potential code execution. This issue demonstrates the inherent complexity of modern web browsers and their JavaScript engines, which must balance performance optimization with security robustness.
The technical implementation of this vulnerability involves memory corruption that occurs during JavaScript interpretation and execution within the WebKit rendering engine. Attackers could construct web pages containing malicious JavaScript code that triggers buffer overflows or use-after-free conditions in the browser's memory management systems. These conditions allow attackers to manipulate memory layout and potentially execute arbitrary code with the privileges of the compromised browser process. The vulnerability is particularly dangerous because it operates at the browser level without requiring user interaction beyond visiting a malicious website, making it a prime target for drive-by download attacks.
From an operational perspective, this vulnerability posed significant risks to enterprise and individual users alike, as it could be exploited through various attack vectors including malicious websites, compromised web applications, or social engineering campaigns. The impact extends beyond simple application crashes to potential full system compromise, as successful exploitation could lead to persistent backdoors, data exfiltration, or further lateral movement within network environments. Organizations using affected Safari versions faced immediate security risks, particularly in environments where users might encounter untrusted web content or where browser-based attacks were common.
Security professionals should have implemented immediate mitigations including prompt patching of Safari to version 5.0.6 or later, which contained the necessary fixes for the memory corruption issues. Additional protective measures included browser hardening configurations, network-based filtering of suspicious web content, and user education regarding safe browsing practices. The vulnerability highlights the importance of keeping browser software updated and demonstrates how seemingly isolated JavaScript engine flaws can have cascading security implications. Organizations should have also considered implementing web application firewalls and content filtering solutions to reduce exposure to such attacks. This vulnerability serves as a reminder of the critical need for comprehensive browser security and the importance of following security advisories from vendors like Apple to maintain robust defense-in-depth strategies.