CVE-2012-3599 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 • 04/13/2021
The vulnerability identified as CVE-2012-3599 represents a critical memory corruption flaw within WebKit's JavaScript engine implementation that affected Apple Safari versions prior to 6.0. This vulnerability resides in the core rendering engine that powers Safari's web browsing capabilities and demonstrates the inherent risks associated with complex JavaScript interpreters. The flaw enables remote attackers to craft malicious web pages that can trigger unpredictable behavior in the browser's memory management system. Security researchers have classified this as a memory corruption vulnerability that can lead to arbitrary code execution, making it particularly dangerous for end users who may unknowingly visit compromised websites. The vulnerability operates through sophisticated exploitation techniques that leverage the JavaScript engine's handling of specific data structures and memory allocation patterns.
The technical implementation of this vulnerability stems from improper memory management within WebKit's JavaScript interpreter, specifically in how it handles certain object references and memory deallocation sequences. Attackers can construct malicious web content that causes the browser to allocate memory in unexpected ways, leading to buffer overflows or use-after-free conditions. This type of vulnerability falls under the CWE-125 weakness category, which describes out-of-bounds read conditions that can result in memory corruption and arbitrary code execution. The flaw is particularly insidious because it requires no user interaction beyond visiting a malicious website, making it a prime candidate for drive-by download attacks. The vulnerability's exploitation mechanism typically involves creating specific JavaScript objects that trigger memory corruption when processed by the browser's rendering engine, allowing attackers to execute malicious code with the privileges of the browser process.
The operational impact of CVE-2012-3599 extends beyond simple application crashes, as it provides attackers with a pathway to achieve full system compromise through remote code execution. When exploited successfully, this vulnerability allows threat actors to bypass standard security controls and execute arbitrary commands on affected systems. The memory corruption can be leveraged to inject malicious code into the browser's memory space, potentially enabling attackers to establish persistent backdoors or escalate privileges. This vulnerability represents a significant risk to enterprise environments where users may inadvertently visit compromised websites, as it can be exploited through social engineering campaigns or compromised advertising networks. The lack of user interaction requirements makes this vulnerability particularly dangerous for widespread exploitation, as it can be deployed through automated scanning tools or malicious advertisements without requiring any specific user action.
Organizations and individuals affected by this vulnerability should immediately update to Safari 6.0 or later versions that contain the necessary patches to address the memory corruption issues. The patch implementation by Apple specifically targeted the JavaScript engine's memory management routines and corrected the improper handling of object references that led to the vulnerability. Security teams should implement network-based protections such as web application firewalls and content filtering solutions to block access to known malicious websites. Additionally, browser hardening techniques including sandboxing and privilege separation should be implemented to limit the potential damage from successful exploitation attempts. The vulnerability serves as a reminder of the critical importance of keeping browser software updated and implementing comprehensive security monitoring to detect potential exploitation attempts. Organizations should also consider implementing browser security policies that restrict access to untrusted websites and maintain regular vulnerability assessments to identify similar memory corruption issues in other browser components.