CVE-2012-3679 in iOS
Summary
by MITRE
WebKit, as used in Apple Safari before 6.0, 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-2012-07-25-1.
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Analysis
by VulDB Data Team • 01/04/2025
The vulnerability identified as CVE-2012-3679 represents a critical memory corruption flaw within WebKit engine's implementation in Apple Safari browsers prior to version 6.0. This vulnerability demonstrates the inherent risks associated with complex web rendering engines that process untrusted content from web pages. The flaw exists in how WebKit handles certain crafted web content, specifically in the manner it processes memory allocations and deallocations during web page rendering. This type of vulnerability falls under the category of heap-based buffer overflows and memory corruption issues that have historically been among the most dangerous classes of vulnerabilities in web browsers due to their potential for arbitrary code execution.
The technical implementation of this vulnerability stems from improper handling of memory operations within WebKit's JavaScript engine and rendering components. Attackers can craft malicious web pages that exploit memory corruption conditions through specific sequences of JavaScript or HTML/CSS code that trigger unexpected behavior in the browser's memory management system. When a user visits such a crafted website, the malicious code causes the browser to allocate memory in unexpected ways or access memory locations that have already been freed, leading to either arbitrary code execution or application crashes. This vulnerability is particularly concerning because it operates at the intersection of JavaScript execution and low-level memory management, creating a pathway for sophisticated attacks that can bypass traditional security controls.
The operational impact of CVE-2012-3679 extends beyond simple denial of service scenarios to include full system compromise potential. When successful, attackers can execute arbitrary code with the privileges of the browser process, potentially leading to complete system compromise depending on the user's permissions and system configuration. The vulnerability affects all versions of Safari before 6.0, including both desktop and mobile implementations, making it particularly dangerous in enterprise environments where users may not be regularly updating their browsers. This type of vulnerability aligns with ATT&CK technique T1059.007 for JavaScript execution and T1068 for local privilege escalation, as the initial exploitation often requires no user interaction beyond visiting a malicious website, and the resulting code execution can potentially be leveraged for further system compromise. The vulnerability's classification under CWE-125 indicates it involves out-of-bounds read conditions, while the memory corruption aspects align with CWE-787 for out-of-bounds write conditions.
Mitigation strategies for this vulnerability require immediate browser updates to version 6.0 or later, which includes the necessary patches to address the memory handling flaws in WebKit's rendering engine. Organizations should implement comprehensive patch management procedures to ensure all Safari installations are updated promptly, particularly in environments where users may not automatically receive updates. Additional protective measures include implementing web content filtering solutions, deploying sandboxing technologies, and establishing security awareness training to help users recognize potentially malicious websites. Network-level protections such as intrusion detection systems and web proxies can help detect and block access to known malicious domains. The vulnerability's characteristics also make it suitable for detection through behavioral analysis systems that monitor for unusual memory access patterns or JavaScript execution sequences that might indicate exploitation attempts. Organizations should also consider implementing browser hardening techniques such as disabling unnecessary JavaScript features, restricting access to local file systems, and employing privilege separation mechanisms to limit the potential impact of successful exploitation attempts.