CVE-2012-3646 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-2012-3646 represents a critical memory corruption flaw within WebKit engine components that power Apple Safari browser versions prior to 6.0. This vulnerability exists in the rendering engine's handling of malformed web content and provides attackers with the capability to execute arbitrary code remotely or induce denial of service conditions through carefully crafted web pages. The flaw specifically affects the way WebKit processes certain web elements, creating opportunities for privilege escalation and system compromise that extend beyond typical browser-based attacks. The vulnerability operates at a fundamental level within the browser's architecture, exploiting weaknesses in memory management and object handling mechanisms that are essential for proper web page rendering.
The technical implementation of this vulnerability stems from improper memory handling during the processing of web content, particularly when encountering malformed or specially crafted HTML elements. Attackers can leverage this flaw by hosting malicious web pages that trigger specific memory corruption patterns within the WebKit engine. The vulnerability manifests through buffer overflows, use-after-free conditions, or other memory management errors that occur when the browser attempts to render certain types of web content. These memory corruption issues can be exploited to overwrite critical memory locations, potentially allowing attackers to inject and execute malicious code with the privileges of the browser process. The flaw operates at the intersection of multiple security domains including memory safety, browser security, and application sandboxing mechanisms that are designed to isolate browser processes from system resources.
The operational impact of CVE-2012-3646 extends beyond simple exploitation capabilities to encompass significant risks for user systems and enterprise environments. Successful exploitation can result in complete system compromise, allowing attackers to execute arbitrary commands, access sensitive data, or maintain persistent access to affected systems. The vulnerability's potential for denial of service creates additional operational concerns as attackers can disrupt browser functionality or cause system instability. Organizations running affected Safari versions face increased risk of targeted attacks, particularly in environments where users may inadvertently visit malicious websites or where social engineering attacks are prevalent. The vulnerability's classification aligns with CWE-125, which addresses out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write operations, both of which are common vectors for memory corruption exploits in web browsers. From an ATT&CK framework perspective, this vulnerability maps to techniques involving exploitation for privilege escalation and initial access through web-based attack vectors.
Mitigation strategies for CVE-2012-3646 primarily focus on immediate remediation through software updates and browser version upgrades. Apple's release of Safari 6.0 addressed the vulnerability through memory management improvements and enhanced input validation within the WebKit engine. Organizations should implement comprehensive patch management processes to ensure all affected systems receive updates promptly. Additional protective measures include browser hardening configurations, implementation of web content filtering systems, and user education regarding safe browsing practices. Network-level protections such as web application firewalls and intrusion detection systems can provide additional layers of defense against exploitation attempts. Security monitoring should focus on detecting anomalous browser behavior or unexpected memory usage patterns that might indicate exploitation attempts. The vulnerability serves as a reminder of the importance of maintaining current browser versions and implementing layered security approaches to protect against sophisticated web-based attacks that target core browser components.