CVE-2012-3631 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-2012-3631 represents a critical memory corruption flaw within WebKit engine components that powered Apple Safari browsers prior to version 6.0. This vulnerability falls under the category of remote code execution and denial of service conditions, making it particularly dangerous for web-based attack scenarios. The flaw specifically resides in how WebKit processes certain web content, creating opportunities for malicious actors to craft specially designed websites that can exploit the underlying memory management issues. This vulnerability is distinct from other WebKit-related issues documented in APPLE-SA-2012-07-25-1, indicating it operates through different attack vectors or code paths within the browser engine. The affected WebKit implementation was widely deployed across Apple's ecosystem, including iOS devices and Mac operating systems, making it a significant security concern for millions of users.
The technical nature of this vulnerability stems from improper memory handling within WebKit's rendering engine, where crafted web content can trigger buffer overflows, use-after-free conditions, or other memory corruption patterns. When Safari processes malicious web pages, the WebKit engine fails to properly validate or sanitize certain data structures, leading to unpredictable memory behavior. Attackers can leverage this by hosting malicious web content that, when loaded in Safari, causes the browser to allocate or access memory in unintended ways. The vulnerability can manifest as either arbitrary code execution, allowing attackers to run malicious software on affected systems, or as denial of service conditions that crash the browser application. These memory corruption issues typically occur during the parsing or rendering of complex web elements such as JavaScript objects, DOM manipulations, or multimedia content that WebKit processes.
The operational impact of CVE-2012-3631 extends beyond simple browser crashes, as the memory corruption can be exploited to gain unauthorized access to system resources and potentially execute malicious code with the privileges of the browser process. This makes it particularly dangerous in environments where users may encounter malicious websites through social engineering, drive-by downloads, or compromised web services. The vulnerability affects a broad range of Apple devices including iPhones, iPads, and Mac computers running affected versions of Safari, creating a widespread attack surface. Security researchers have noted that such memory corruption vulnerabilities often follow patterns consistent with CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write conditions. The attack vectors align with techniques commonly catalogued in the MITRE ATT&CK framework under T1059 for command and scripting interpreter and T1203 for Exploitation for Client Execution, demonstrating how attackers can leverage browser vulnerabilities to establish persistent access.
Mitigation strategies for CVE-2012-3631 primarily focus on immediate system updates and browser patching, as Apple released Safari 6.0 to address this vulnerability. Organizations should implement comprehensive patch management protocols to ensure all affected systems receive updates promptly. Network administrators can deploy web filtering solutions to block access to known malicious domains, while security teams should monitor for exploitation attempts through network traffic analysis. Browser hardening techniques such as sandboxing, memory protection mechanisms, and restricted user privileges can reduce the potential impact of successful exploitation. Additionally, security awareness training for end users remains crucial in preventing accidental exposure to malicious websites, as many attacks rely on social engineering to deliver payloads. The vulnerability highlights the importance of regular security assessments and the need for robust vulnerability management processes that can quickly identify and remediate similar memory corruption issues across complex software ecosystems.