CVE-2017-2503 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. macOS before 10.12.5 is affected. The issue involves the "Intel Graphics Driver" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
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Analysis
by VulDB Data Team • 12/24/2020
The vulnerability identified as CVE-2017-2503 represents a critical security flaw within Apple's macOS operating system affecting versions prior to 10.12.5. This issue specifically targets the Intel Graphics Driver component which serves as the fundamental interface between the operating system and graphics hardware. The vulnerability stems from improper memory handling within the graphics driver's kernel extension, creating a pathway for malicious code execution that operates at elevated privileges. Attackers can exploit this weakness by crafting specially designed applications that trigger memory corruption when processed by the graphics driver, potentially allowing them to execute arbitrary code with system-level privileges. The flaw demonstrates characteristics consistent with heap-based buffer overflow conditions that have been categorized under CWE-121 in the Common Weakness Enumeration framework, indicating insufficient memory protection mechanisms during graphics processing operations. This vulnerability operates at the kernel level where it can bypass standard user-space security controls and access protected system resources.
The operational impact of CVE-2017-2503 extends beyond simple privilege escalation capabilities, as it can be leveraged to achieve persistent system compromise and data exfiltration. When exploited successfully, the vulnerability allows attackers to execute malicious code within the privileged context of the graphics driver, effectively granting them access to system memory and kernel functions. The memory corruption aspect of this flaw can potentially lead to system crashes or reboots, creating a denial of service condition that may be used as a vector for more sophisticated attacks. Security researchers have noted that this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the privilege escalation and defense evasion tactics, where attackers can leverage kernel-level access to maintain persistence and avoid detection. The exploitation requires minimal user interaction since the malicious application can be designed to automatically trigger the vulnerable code path during normal graphics processing operations.
Mitigation strategies for CVE-2017-2503 primarily focus on immediate system updates and operational security measures. Apple addressed this vulnerability through the release of macOS 10.12.5, which includes patches to the Intel Graphics Driver component that correct the memory handling issues. Organizations should prioritize immediate deployment of this security update across all affected systems to eliminate the exploitation risk. Additional defensive measures include implementing application whitelisting policies that restrict execution of untrusted applications, monitoring system logs for unusual graphics driver activity, and employing endpoint protection solutions that can detect anomalous behavior patterns associated with kernel-level exploits. Security teams should also consider network segmentation to limit potential lateral movement if an attacker successfully exploits this vulnerability, while maintaining regular vulnerability assessments to identify similar weaknesses in other system components. The vulnerability serves as a reminder of the critical importance of keeping graphics drivers and kernel extensions updated, as these components often represent attack surfaces that can be leveraged for system compromise. Organizations should also implement comprehensive security monitoring that can detect memory corruption patterns and unusual privilege escalation events that may indicate exploitation attempts.