CVE-2011-2873 in iOS
Summary
by MITRE
WebKit, as used in Apple iOS before 5.1 and iTunes before 10.6, 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-2012-03-07-1 and APPLE-SA-2012-03-07-2.
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Analysis
by VulDB Data Team • 03/21/2021
The vulnerability identified as CVE-2011-2873 represents a critical memory corruption flaw within WebKit engine implementations across Apple iOS versions prior to 5.1 and iTunes versions before 10.6. This vulnerability operates through a remote code execution vector that enables attackers to compromise systems simply by visiting malicious websites, making it particularly dangerous in the context of web-based attacks. The flaw specifically affects the rendering engine that powers Safari browsers and web content within Apple's ecosystem, creating a pathway for adversaries to gain unauthorized control over affected devices.
This memory corruption vulnerability stems from improper handling of certain web content structures within WebKit's JavaScript engine and rendering components. The technical implementation flaw allows attackers to manipulate memory allocation patterns and execute arbitrary code through carefully crafted web pages that exploit buffer overflows or use-after-free conditions within the browser's memory management systems. The vulnerability is classified under CWE-125 as an out-of-bounds read condition, which can lead to unpredictable behavior and potential code execution. The attack requires no user interaction beyond visiting a malicious website, making it particularly effective for drive-by download scenarios and social engineering campaigns.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise and potential data exfiltration. When successfully exploited, the vulnerability can cause applications to crash or allow attackers to inject malicious code that persists across system sessions. This represents a significant threat to mobile device security, as iOS devices often contain sensitive personal and corporate data that attackers can access through such exploitation. The vulnerability also affects iTunes installations, creating additional attack surfaces for adversaries targeting desktop systems. According to ATT&CK framework categorization, this vulnerability aligns with T1059.007 for scripting and T1068 for exploit development, representing a sophisticated attack vector that leverages browser engine vulnerabilities.
Mitigation strategies for CVE-2011-2873 primarily focus on immediate system updates and patch management. Apple addressed this vulnerability through iOS 5.1 and iTunes 10.6 updates, which included memory safety improvements and code validation mechanisms within WebKit. Organizations should implement comprehensive patch management programs to ensure all affected systems receive updates promptly. Network-based mitigations can include web content filtering and sandboxing mechanisms that restrict potentially malicious content from reaching vulnerable systems. Additionally, security monitoring should focus on detecting unusual network traffic patterns and application behavior that might indicate exploitation attempts. The vulnerability demonstrates the importance of regular security assessments and maintaining updated security controls as part of enterprise cybersecurity strategies, particularly for mobile platforms that handle sensitive data and user information.