CVE-2012-3637 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-2012-3637 represents a critical memory corruption flaw within WebKit engine implementation in Apple Safari browsers prior to version 6.0. This issue resides in the core rendering engine that processes web content, making it a fundamental component of the browser's security architecture. The vulnerability stems from insufficient input validation and memory management practices within the WebKit engine's handling of malformed web content, creating an exploitable condition that adversaries can leverage remotely. The flaw specifically affects the browser's ability to safely process crafted web pages, leading to unpredictable memory state corruption that can be systematically exploited by malicious actors.
The technical nature of this vulnerability operates through memory corruption mechanisms that allow attackers to manipulate the browser's memory layout during web page rendering. When Safari processes a specially crafted web page containing malicious code or malformed elements, the WebKit engine fails to properly validate input parameters or manage memory allocation, resulting in buffer overflows, use-after-free conditions, or other memory corruption patterns. This type of vulnerability falls under the CWE-119 weakness category, which encompasses memory safety issues including buffer overflows and improper memory handling. The vulnerability enables attackers to execute arbitrary code with the privileges of the browser process, potentially leading to complete system compromise or denial of service conditions.
The operational impact of CVE-2012-3637 extends beyond simple exploitation capabilities to encompass significant security implications for users of affected Safari versions. Remote attackers can leverage this vulnerability to gain unauthorized code execution on targeted systems, potentially leading to data theft, system takeover, or persistent backdoor installation. The vulnerability's remote nature means that users can be compromised simply by visiting malicious websites, making it particularly dangerous in phishing campaigns or drive-by download scenarios. The memory corruption aspect also creates potential for denial of service attacks that can crash the browser application, disrupting user productivity and potentially masking more sophisticated attacks. This vulnerability aligns with ATT&CK technique T1059.003 for command and scripting interpreter and T1489 for drive-by compromise, representing a classic example of how browser engine vulnerabilities can be weaponized at scale.
Mitigation strategies for CVE-2012-3637 require immediate patch deployment and comprehensive security hardening measures. Users must upgrade to Safari 6.0 or later versions where Apple has implemented memory safety improvements and input validation controls. System administrators should consider implementing web application firewalls and content filtering solutions to block access to known malicious domains. Browser security enhancements including sandboxing, memory protection mechanisms, and automatic update policies should be enabled to reduce attack surface. Organizations should also conduct regular security assessments to identify and remediate similar vulnerabilities in their web browsing environments. The vulnerability demonstrates the critical importance of timely patch management and the need for robust browser security architectures that can prevent memory corruption exploits from succeeding. Security teams should monitor for related vulnerabilities in WebKit-based browsers and implement layered defensive measures to protect against similar memory safety issues that may arise in other browser components or web technologies.