CVE-2022-26757 in macOS
Summary
by MITRE • 05/27/2022
A use after free issue was addressed with improved memory management. This issue is fixed in tvOS 15.5, iOS 15.5 and iPadOS 15.5, Security Update 2022-004 Catalina, watchOS 8.6, macOS Big Sur 11.6.6, macOS Monterey 12.4. An application may be able to execute arbitrary code with kernel privileges.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 05/28/2022
The vulnerability identified as CVE-2022-26757 represents a critical use-after-free flaw in Apple's operating systems that has been addressed through enhanced memory management mechanisms. This issue affects multiple Apple platforms including iOS 15.5, tvOS 15.5, iPadOS 15.5, watchOS 8.6, macOS Big Sur 11.6.6, and macOS Monterey 12.4, demonstrating the widespread nature of the memory management weakness across Apple's ecosystem. The vulnerability stems from improper handling of memory allocation and deallocation processes, creating conditions where freed memory blocks can still be accessed by malicious applications, leading to potential privilege escalation scenarios.
The technical exploitation of this use-after-free vulnerability occurs when an application successfully manipulates memory management operations to cause a program to access memory that has already been freed and potentially reallocated. This flaw falls under the CWE-416 category of Use After Free, which is a well-documented vulnerability pattern where software continues to reference memory after it has been freed, potentially allowing attackers to execute arbitrary code with elevated privileges. The vulnerability's exploitation requires sophisticated techniques to leverage the freed memory references for code execution, typically involving heap spraying or memory corruption methods that can be used to gain kernel-level access.
The operational impact of CVE-2022-26757 is severe as it provides a pathway for malicious applications to achieve kernel privileges, which represents the highest level of system access available to any software component. This privilege escalation capability means that an attacker who successfully exploits this vulnerability could potentially gain complete control over the affected device, enabling them to install malicious applications, access all user data, modify system files, or even disable security mechanisms. The implications extend beyond individual device compromise to potential network-wide attacks when considering that compromised devices could serve as entry points for broader infiltration campaigns.
Mitigation strategies for CVE-2022-26757 primarily involve applying the security updates released by Apple, which include the Security Update 2022-004 for macOS Catalina and subsequent platform-specific patches. Organizations should prioritize immediate deployment of these updates across all affected systems, particularly in enterprise environments where device management systems can automate the update process. Additionally, implementing network monitoring solutions that can detect anomalous behavior patterns consistent with privilege escalation attempts can provide early warning capabilities. The ATT&CK framework categorizes this vulnerability under T1059 (Command and Scripting Interpreter) and T1068 (Exploitation for Privilege Escalation) techniques, highlighting the need for comprehensive endpoint protection measures that can detect and prevent exploitation attempts. System administrators should also consider implementing application whitelisting policies and monitoring for unusual memory allocation patterns that might indicate exploitation attempts, while maintaining regular security assessments to identify potential vulnerabilities in their device fleet.