CVE-2019-6234 in iCloud
Summary
by MITRE
A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 12.1.3, tvOS 12.1.2, Safari 12.0.3, iTunes 12.9.3 for Windows, iCloud for Windows 7.10. Processing maliciously crafted web content may lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 07/03/2023
The vulnerability identified as CVE-2019-6234 represents a critical memory corruption flaw that affected multiple Apple operating systems and applications. This issue stems from inadequate memory handling mechanisms that fail to properly validate or sanitize memory operations during web content processing. The vulnerability manifests when maliciously crafted web content is rendered within affected applications, creating conditions where memory corruption can occur. The flaw specifically impacts iOS 12.1.3, tvOS 12.1.2, Safari 12.0.3, iTunes 12.9.3 for Windows, and iCloud for Windows 7.10, indicating a widespread impact across Apple's ecosystem. From a cybersecurity perspective, this vulnerability aligns with CWE-122, which describes improper restriction of operations within a memory buffer, and represents a classic buffer overflow condition that can be exploited for privilege escalation.
The technical exploitation of this vulnerability occurs through web content manipulation that triggers memory corruption during rendering processes. When users encounter maliciously crafted web pages or content, the affected applications fail to properly manage memory allocation and deallocation, leading to memory corruption that can be leveraged by attackers. The attack vector primarily involves web-based exploitation where an attacker can inject malicious code into web content that gets processed by vulnerable applications. This creates a potential for arbitrary code execution, allowing attackers to run malicious programs with the privileges of the affected application. The exploitation mechanism follows patterns consistent with ATT&CK technique T1059.001 for command and script interpreter, where the corrupted memory state enables execution of unintended code. The vulnerability's impact extends beyond individual applications to potentially compromise entire operating system sessions.
The operational impact of CVE-2019-6234 is significant for organizations and individual users who rely on Apple's ecosystem for their computing needs. The vulnerability's ability to enable arbitrary code execution means that attackers could potentially gain full control over affected systems, leading to data theft, system compromise, or further lateral movement within networks. Organizations using Apple products for business operations face increased risk of security breaches, particularly in environments where users regularly access web content or where the affected applications are frequently used. The cross-platform nature of the vulnerability means that mitigation efforts must address multiple product lines, complicating security management and increasing the attack surface. Users who regularly browse the web or use Apple's media applications are particularly at risk, as the exploitation can occur through routine web browsing activities without user awareness.
Mitigation strategies for CVE-2019-6234 primarily focus on immediate patch deployment and enhanced security monitoring. Organizations should prioritize updating all affected systems to the patched versions mentioned in the advisory, specifically iOS 12.1.3, tvOS 12.1.2, Safari 12.0.3, iTunes 12.9.3 for Windows, and iCloud for Windows 7.10. The patch addresses the underlying memory handling issues by implementing proper bounds checking and memory validation mechanisms that prevent the corruption conditions from occurring. Security teams should also implement network monitoring to detect potential exploitation attempts and establish user awareness programs about the risks of visiting untrusted websites. Additional protective measures include implementing web content filtering solutions, restricting browser functionality in high-risk environments, and maintaining comprehensive incident response procedures. From a compliance perspective, organizations should document their remediation efforts and verify that all affected systems have been properly updated to prevent potential regulatory violations related to unpatched security vulnerabilities.