CVE-2022-26752 in macOS
Summary
by MITRE • 05/27/2022
A buffer overflow issue was addressed with improved memory handling. This issue is fixed in macOS Monterey 12.4. An application may be able to execute arbitrary code with kernel privileges.
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Analysis
by VulDB Data Team • 05/28/2022
The vulnerability identified as CVE-2022-26752 represents a critical buffer overflow flaw within the macOS operating system that was resolved in version 12.4. This issue stems from inadequate memory management practices that allowed malicious applications to exploit memory boundaries and potentially execute arbitrary code with elevated kernel privileges. The flaw exists in the kernel memory handling mechanisms, specifically in how the system processes memory allocations and buffer operations. Buffer overflow vulnerabilities of this nature are particularly dangerous because they can be leveraged to bypass security controls and gain unauthorized access to system resources. The vulnerability falls under the Common Weakness Enumeration category CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. This particular flaw demonstrates the classic attack vector where an application can manipulate memory allocation routines to overwrite critical kernel structures, potentially leading to complete system compromise. The attack surface is significant as it affects all versions of macOS prior to 12.4, making it a widespread concern for system administrators and security professionals managing Apple environments.
The technical implementation of this buffer overflow vulnerability involves memory corruption during kernel operations where insufficient validation occurs when handling memory buffers. When an application attempts to write data beyond the allocated buffer boundaries, the overflow can overwrite adjacent memory regions including kernel metadata, function pointers, or return addresses. This type of vulnerability is particularly insidious because it operates at the kernel level, where the privileges are highest and the impact is most severe. The attack typically requires an application to be able to trigger the vulnerable code path through legitimate system interactions or by exploiting other initial access vectors. The exploit process would involve carefully crafted inputs or memory operations that cause the buffer to overflow and redirect execution flow to malicious code. This scenario aligns with ATT&CK technique T1068, which covers the exploitation of legitimate system tools and processes to gain elevated privileges. The vulnerability represents a failure in memory safety practices, where proper bounds checking and memory allocation validation were not implemented or were insufficiently enforced in the kernel memory management subsystem.
The operational impact of CVE-2022-26752 extends far beyond simple system instability or application crashes. When exploited successfully, this vulnerability can provide attackers with complete kernel-level access, enabling them to bypass all standard security controls and execute arbitrary code with the highest system privileges. This level of access allows for persistent backdoor installation, complete system compromise, and data exfiltration without detection. The implications for enterprise environments are particularly severe as attackers could use this vulnerability to establish footholds within networks, escalate privileges across multiple systems, and maintain long-term access to sensitive infrastructure. Organizations running affected macOS versions face significant risk of advanced persistent threats and targeted attacks that could result in substantial financial losses, data breaches, and regulatory compliance violations. The vulnerability also impacts the overall security posture of macOS environments, as it represents a fundamental flaw in the operating system's core memory management capabilities. System administrators must consider that this vulnerability could be exploited in conjunction with other attack vectors, creating multi-stage attack scenarios that are difficult to detect and mitigate effectively.
Mitigation strategies for CVE-2022-26752 primarily focus on immediate remediation through the installation of macOS Monterey 12.4 or subsequent updates that contain the necessary memory handling improvements. Organizations should prioritize patch management processes to ensure all macOS systems are updated promptly, as this vulnerability represents a critical security risk that could be exploited by sophisticated threat actors. Additionally, implementing network monitoring and endpoint detection capabilities can help identify potential exploitation attempts, although detection may be challenging due to the nature of kernel-level attacks. Security teams should also consider deploying additional protective measures such as application whitelisting, kernel extension restrictions, and monitoring for anomalous memory allocation patterns that could indicate exploitation attempts. The vulnerability underscores the importance of maintaining up-to-date security patches and implementing comprehensive vulnerability management programs that include regular security assessments and penetration testing to identify similar issues before they can be exploited. Organizations should also review their incident response procedures to ensure they can effectively respond to potential exploitation attempts of this nature, given the severe impact that kernel-level privilege escalation can have on system security.