CVE-2018-4273 in Safari
Summary
by MITRE
Multiple memory corruption issues were addressed with improved input validation. This issue affected versions prior to iOS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.
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Analysis
by VulDB Data Team • 03/01/2020
The vulnerability identified as CVE-2018-4273 represents a series of memory corruption flaws that existed in multiple Apple operating systems and applications prior to specific security updates. These issues stem from insufficient input validation mechanisms that allowed attackers to exploit memory handling routines through malformed inputs or unexpected data sequences. The vulnerability affects a broad range of Apple products including iOS devices, tvOS systems, watchOS platforms, Safari web browser, and various desktop applications such as iTunes and iCloud for Windows. The affected versions demonstrate a pattern of memory corruption vulnerabilities that could potentially lead to arbitrary code execution or system instability. Security researchers identified these flaws during routine vulnerability assessments and code reviews, revealing weaknesses in the input sanitization processes that govern how the affected systems handle user-provided data. The memory corruption issues typically manifest when the operating systems process malformed data structures, leading to unpredictable behavior that could be exploited by malicious actors. These vulnerabilities represent a significant concern for enterprise environments where Apple devices are extensively deployed, as they could enable attackers to gain unauthorized access to sensitive information or compromise system integrity. The affected software versions indicate that Apple had not yet implemented robust input validation measures that would prevent attackers from manipulating memory allocation and data handling processes.
The technical implementation of these memory corruption vulnerabilities involves improper handling of input data within the affected Apple applications and operating systems. When applications receive data from external sources or user interactions, they typically validate this input before processing it further. However, in the case of CVE-2018-4273, the validation mechanisms were insufficient to prevent malformed data from triggering memory corruption conditions. Attackers could craft specific inputs designed to exploit buffer overflows, use-after-free conditions, or other memory management flaws that occur when the system attempts to access memory locations that have already been freed or when data exceeds allocated buffer boundaries. These conditions often result from inadequate bounds checking, improper memory deallocation, or flawed pointer arithmetic within the application code. The vulnerabilities are particularly dangerous because they can be triggered through various attack vectors including web browsing activities, file processing, network communications, or even through specially crafted emails. The memory corruption occurs at the system level, potentially allowing attackers to execute arbitrary code with elevated privileges or cause system crashes that could be exploited for more sophisticated attacks. This type of vulnerability aligns with common weakness enumerations such as CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read vulnerabilities. The attack patterns associated with these issues often map to techniques described in the attack tree framework, where initial exploitation leads to privilege escalation and persistent access to target systems.
The operational impact of CVE-2018-4273 extends across multiple threat vectors and attack surfaces within Apple's ecosystem, creating significant risks for organizations and individual users who rely on affected systems. Organizations utilizing Apple devices in enterprise environments face potential exposure to advanced persistent threats that could leverage these memory corruption flaws to establish footholds within their networks. The vulnerability's presence in Safari browser creates particular concern for web-based attacks, as users may inadvertently encounter malicious content that triggers the memory corruption conditions. Additionally, the inclusion of iTunes and iCloud for Windows in the affected list demonstrates that the vulnerability extends beyond mobile platforms to desktop applications, potentially enabling attackers to compromise both mobile and desktop systems through coordinated attacks. The impact on system stability is substantial, as memory corruption can lead to unexpected application crashes, system reboots, or complete system failures that disrupt normal business operations. Users may experience data loss or corruption when applications crash due to these vulnerabilities, particularly in scenarios involving critical business processes or personal data management. The widespread nature of the affected software versions indicates that many users were potentially exposed to these risks for extended periods, as the vulnerabilities existed in widely deployed software releases. Security teams must consider these vulnerabilities as part of their comprehensive threat assessment, particularly when evaluating the risk of zero-day exploits that could leverage these memory corruption flaws for targeted attacks.
Mitigation strategies for CVE-2018-4273 should focus on immediate remediation through official security updates provided by Apple, while also implementing additional protective measures to reduce attack surface exposure. Organizations should prioritize updating all affected systems to the latest available versions, including iOS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, and iCloud for Windows 7.6, as these releases contain the necessary patches to address the memory corruption vulnerabilities. Network administrators should implement monitoring solutions to detect potential exploitation attempts targeting these vulnerabilities, particularly in web browsing activities or file processing scenarios. Security teams should conduct comprehensive vulnerability assessments to identify any remaining systems that may still be running affected versions, as even a single vulnerable device within a network can compromise overall security posture. Additional protective measures include implementing web filtering solutions to block access to known malicious domains, enabling application whitelisting to prevent execution of unauthorized software, and deploying endpoint protection solutions that can detect and block exploitation attempts. The implementation of these mitigations aligns with best practices recommended by industry frameworks such as the NIST Cybersecurity Framework and follows the principles of defense in depth as outlined in the MITRE ATT&CK framework. Organizations should also consider implementing user education programs to raise awareness about the risks associated with visiting untrusted websites or opening suspicious email attachments that could trigger these memory corruption vulnerabilities. Regular security assessments and penetration testing should be conducted to ensure that the implemented mitigations remain effective against evolving threat landscapes and potential exploitation attempts.