CVE-2012-3638 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-2012-3638 represents a critical memory corruption flaw within WebKit engine components that power Apple Safari browsers prior to version 6.0. This vulnerability manifests through maliciously crafted web content that can trigger unpredictable behavior in the browser's rendering engine, creating opportunities for remote code execution or system instability. The flaw specifically resides in how WebKit processes certain web page elements, making it distinct from other WebKit-related vulnerabilities documented in the APPLE-SA-2012-07-25-1 advisory. The affected WebKit versions demonstrate a fundamental weakness in memory management and input validation that enables attackers to manipulate browser memory structures through carefully constructed web pages.
The technical exploitation of this vulnerability occurs when a user visits a malicious website that contains specially crafted HTML, JavaScript, or CSS elements designed to trigger memory corruption within the WebKit engine. This memory corruption typically manifests as heap overflow conditions or use-after-free errors that can be leveraged to execute arbitrary code with the privileges of the browser process. The vulnerability's classification aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers buffer overflow vulnerabilities in heap memory. Attackers can exploit this weakness by crafting web content that causes the browser to allocate memory in unexpected ways, leading to memory corruption that can be controlled to execute malicious instructions.
The operational impact of CVE-2012-3638 extends beyond simple browser crashes, as it provides attackers with persistent remote execution capabilities on affected systems. When successfully exploited, this vulnerability can enable full system compromise, allowing attackers to install malware, steal sensitive data, or establish persistent backdoors within the victim's environment. The vulnerability affects not only individual users but also enterprise environments where Safari browsers are deployed, potentially creating widespread security risks across organizations. The denial of service component of this vulnerability can also be used as a precursor to more sophisticated attacks, as it can be combined with other techniques to create more reliable exploitation conditions.
Organizations and users affected by this vulnerability should immediately update to Safari version 6.0 or later, which contains patches addressing the memory corruption issues in WebKit. System administrators should implement network-based protections including web content filtering and browser hardening measures to reduce exposure while updates are deployed. Security teams should monitor for indicators of compromise related to this vulnerability and consider implementing behavioral analysis tools to detect potential exploitation attempts. The vulnerability demonstrates the importance of maintaining current browser versions and implementing defense-in-depth strategies that include multiple layers of protection against browser-based attacks. This case exemplifies how browser engine vulnerabilities can serve as primary attack vectors in modern cyber warfare campaigns, emphasizing the critical need for timely patch management and continuous security monitoring.