CVE-2013-0991 in iOS
Summary
by MITRE
WebKit, as used in Apple iTunes before 11.0.3, 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 WebKit CVEs listed in APPLE-SA-2013-05-16-1.
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Analysis
by VulDB Data Team • 05/25/2021
The vulnerability identified as CVE-2013-0991 represents a critical security flaw within WebKit engine components embedded in Apple iTunes version 11.0.2 and earlier. This issue specifically affects the iTunes Store browsing functionality and demonstrates the inherent risks present when web rendering engines process untrusted content from remote servers. The vulnerability manifests through man-in-the-middle attack scenarios where adversaries can manipulate network traffic to inject malicious code or trigger system instability. The flaw resides in how WebKit handles certain data structures during iTunes Store interactions, creating potential pathways for remote code execution or denial of service conditions that could compromise the entire iTunes application and potentially the underlying operating system.
The technical implementation of this vulnerability stems from improper memory management and input validation within the WebKit rendering engine's handling of web content retrieved from iTunes Store servers. When users browse the iTunes Store through the affected iTunes version, the WebKit component processes HTML, JavaScript, and other web resources that may contain malformed data structures. This processing can lead to memory corruption issues where buffer overflows or use-after-free conditions occur, causing unpredictable application behavior and system crashes. The vulnerability's classification aligns with CWE-121, which addresses heap-based buffer overflow conditions, and CWE-125, covering out-of-bounds read errors that can result in memory corruption. These memory management flaws create opportunities for attackers to execute arbitrary code with the privileges of the iTunes process, potentially escalating to system-level compromise.
The operational impact of CVE-2013-0991 extends beyond simple application instability to encompass significant security risks for end users and enterprise environments. Attackers leveraging this vulnerability could remotely compromise iTunes installations, potentially gaining access to user data, device information, and sensitive personal details stored within the application. The denial of service aspect creates additional operational concerns as legitimate users might experience application crashes during normal iTunes Store browsing activities, disrupting their media management workflows. Furthermore, the vulnerability's exploitation capabilities align with ATT&CK technique T1059, which covers command and scripting interpreter usage, and T1203, covering legitimate credentials, as attackers could potentially leverage compromised iTunes sessions to access other system resources. Organizations relying on iTunes for media distribution or device management would face increased risk of unauthorized access and data compromise.
Mitigation strategies for this vulnerability require immediate patching of affected iTunes installations to version 11.0.3 or later, which includes WebKit security updates addressing the memory corruption issues. System administrators should implement network monitoring to detect suspicious traffic patterns that might indicate man-in-the-middle attacks targeting iTunes applications. Additionally, users should avoid accessing iTunes Store through untrusted networks and consider implementing network security controls such as SSL inspection and traffic filtering to prevent malicious content injection. The vulnerability highlights the importance of maintaining up-to-date software components and demonstrates how embedded web engines in desktop applications can present significant attack surfaces that require continuous security monitoring and patch management processes. Organizations should also consider implementing application whitelisting policies to restrict iTunes execution to trusted environments and establish incident response procedures for detecting and responding to potential exploitation attempts.