CVE-2017-6986 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. macOS before 10.12.5 is affected. The issue involves the "iBooks" component. It allows attackers to conduct sandbox-escape attacks or cause a denial of service (memory corruption) via a crafted app.
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Analysis
by VulDB Data Team • 09/02/2024
The vulnerability identified as CVE-2017-6986 represents a critical sandbox escape flaw within Apple's iBooks component affecting macOS versions prior to 10.12.5. This security weakness resides in the application's handling of crafted malicious content that can be exploited to bypass system security boundaries. The vulnerability specifically targets the sandboxing mechanisms that are fundamental to macOS security architecture, which are designed to isolate applications from each other and from system resources to prevent unauthorized access and potential system compromise.
The technical flaw manifests through improper input validation and memory management within the iBooks application's processing of specially crafted apps or documents. Attackers can exploit this vulnerability by creating malicious applications that, when opened within iBooks, trigger memory corruption errors that allow the attacker to escape the application's restricted sandbox environment. This type of vulnerability falls under CWE-122, which describes "Heap Overflow" conditions, and represents a classic sandbox escape vector that enables attackers to gain elevated privileges or access to system resources they would normally be restricted from accessing. The memory corruption aspect of this vulnerability can lead to arbitrary code execution within the context of the iBooks process, potentially allowing attackers to execute malicious payloads with the privileges of the compromised application.
The operational impact of CVE-2017-6986 extends beyond simple denial of service scenarios, as it provides attackers with a pathway to escalate privileges and potentially compromise the entire system. When exploited successfully, this vulnerability enables attackers to break out of the sandboxed environment that normally protects macOS applications from accessing sensitive system resources, user data, or other applications. The vulnerability aligns with ATT&CK technique T1055, which covers "Process Injection" and related privilege escalation methods, as the sandbox escape allows for code execution within system processes. Organizations running affected macOS versions face significant risk as this vulnerability can be leveraged to establish persistent access, exfiltrate sensitive data, or deploy additional malicious software without user interaction.
Mitigation strategies for CVE-2017-6986 primarily focus on immediate system updates and security hardening measures. Apple addressed this vulnerability through macOS 10.12.5 update, which included patches to the iBooks component's memory management and input validation routines. System administrators should prioritize applying this update immediately to all affected systems, as the vulnerability has known exploitation methods in the wild. Additional mitigations include implementing application whitelisting policies to restrict iBooks from processing untrusted content, monitoring for suspicious file access patterns, and deploying endpoint protection solutions that can detect and prevent sandbox escape attempts. Organizations should also consider implementing network-based intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability, as the attack vectors often involve downloading and executing malicious content through web browsers or email attachments that eventually trigger the iBooks vulnerability when opened.