CVE-2011-3438 in Safari
Summary
by MITRE
WebKit, as used in Safari 5.0.6, allows remote attackers to cause a denial of service (process crash) or arbitrary code execution.
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Analysis
by VulDB Data Team • 09/20/2020
The vulnerability identified as CVE-2011-3438 represents a critical security flaw within WebKit engine components that power Apple Safari 5.0.6 browser implementation. This issue stems from improper handling of memory management and input validation within the web rendering engine, creating opportunities for malicious actors to exploit the system through crafted web content. The vulnerability specifically affects the way WebKit processes certain data structures, leading to potential memory corruption that can be leveraged for both denial of service and remote code execution attacks.
The technical root cause of this vulnerability lies in buffer overflow conditions and memory management errors that occur when processing malformed web content. Attackers can craft specially designed web pages containing malicious JavaScript or HTML elements that trigger memory corruption within the WebKit rendering engine. These malformed inputs cause the browser to allocate insufficient memory or access invalid memory locations, resulting in program crashes or potentially allowing attackers to execute arbitrary code with the privileges of the affected browser process. The flaw demonstrates characteristics consistent with CWE-121, heap-based buffer overflow, and CWE-122, stack-based buffer overflow, representing fundamental memory safety issues that have been historically prevalent in web browser implementations.
The operational impact of this vulnerability extends beyond simple browser instability, as it provides attackers with potential pathways to compromise user systems entirely. When exploited successfully, the vulnerability enables attackers to execute arbitrary code on victim machines, potentially leading to full system compromise, data exfiltration, or establishment of persistent backdoors. The remote nature of the attack means users can be compromised simply by visiting malicious websites or viewing infected email content, making this vulnerability particularly dangerous in targeted attack scenarios. The vulnerability affects not only individual users but also enterprise environments where Safari is deployed as a corporate browser, creating widespread security implications for organizations relying on Apple's web browser for business operations.
Mitigation strategies for CVE-2011-3438 should prioritize immediate patch deployment through Apple's security updates, as this vulnerability was addressed in subsequent Safari releases. Organizations should implement web content filtering solutions to block suspicious content and consider browser hardening techniques such as sandboxing and privilege separation to limit potential damage from successful exploits. Network-level protections including web application firewalls and intrusion detection systems can provide additional layers of defense by monitoring for known exploit patterns. Security teams should also conduct regular vulnerability assessments to identify similar memory corruption issues within other browser components and ensure comprehensive patch management processes are in place to address future vulnerabilities. The ATT&CK framework categorizes this type of vulnerability under T1059, Command and Scripting Interpreter, and T1499, Endpoint Denial of Service, highlighting the multi-faceted attack surface this vulnerability presents to security operations.