CVE-2011-0133 in iTunes
Summary
by MITRE
WebKit, as used in Apple iTunes before 10.2 on Windows, does not properly access glyph data during layout actions for floating blocks associated with pseudo-elements, which allows man-in-the-middle attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via vectors related to iTunes Store browsing, a different vulnerability than other CVEs listed in APPLE-SA-2011-03-02-1.
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Analysis
by VulDB Data Team • 01/26/2025
The vulnerability identified as CVE-2011-0133 represents a critical memory corruption flaw within WebKit's rendering engine that affected Apple iTunes versions prior to 10.2 on Windows platforms. This issue stems from improper handling of glyph data during layout operations for floating blocks associated with pseudo-elements, creating a pathway for malicious exploitation. The vulnerability specifically manifests during iTunes Store browsing activities, making it particularly dangerous for users engaging with Apple's digital media ecosystem. The flaw demonstrates how web rendering components can introduce security risks even in desktop applications that incorporate web technologies for user interfaces.
The technical implementation of this vulnerability occurs within WebKit's layout engine where the system fails to properly validate or sanitize glyph data when processing floating blocks that are associated with pseudo-elements. This improper access pattern creates memory corruption conditions that can be leveraged by attackers positioned in man-in-the-middle positions. The attack vector specifically targets the rendering pipeline during layout actions, where the application processes visual elements for display. When iTunes encounters certain HTML content or CSS styling that triggers pseudo-element processing, the flawed memory handling causes buffer overflows or memory corruption that can be exploited to execute arbitrary code. This represents a classic heap-based buffer overflow vulnerability that falls under CWE-121, heap-based buffer overflow, and demonstrates the intersection of web rendering engine flaws with application security.
The operational impact of this vulnerability extends beyond simple application crashes, as it provides attackers with the capability to execute arbitrary code on affected systems. This means that users browsing the iTunes Store could be compromised without their knowledge, potentially leading to full system compromise. The vulnerability's classification as a denial of service issue is secondary to its exploitation potential, as the memory corruption can be reliably triggered through crafted web content. Attackers could leverage this flaw by intercepting network traffic or compromising websites that iTunes accesses, making it particularly dangerous for users on untrusted networks. The vulnerability affects a broad user base since iTunes was widely distributed and used for accessing Apple's digital store, creating a significant attack surface.
Mitigation strategies for CVE-2011-0133 focus primarily on updating to Apple iTunes version 10.2 or later, which contains the necessary patches to address the WebKit rendering flaw. System administrators should ensure that all iTunes installations are updated promptly, particularly in enterprise environments where users may be browsing untrusted content. Network security measures such as deep packet inspection and content filtering can help detect and block malicious traffic that might exploit this vulnerability. Additionally, users should be educated about the risks of browsing untrusted websites while using iTunes and should avoid accessing the iTunes Store from public or unsecured networks. The vulnerability highlights the importance of keeping web rendering engines updated, as these components often handle complex parsing and layout operations that can introduce security risks. Organizations should implement regular patch management processes to address similar vulnerabilities in other applications that rely on WebKit or similar rendering technologies, following the ATT&CK framework's guidance on mitigating browser-based attacks through proper application maintenance and network security controls.