CVE-2022-46689: Apple Safari Privilege Escalation Flaw

CVE-2022-46689 Overview

CVE-2022-46689 is a race condition vulnerability affecting multiple Apple operating systems that could allow a malicious application to execute arbitrary code with kernel privileges. The vulnerability exists due to insufficient validation during concurrent operations, creating a Time-of-Check Time-of-Use (TOCTOU) condition that attackers can exploit to gain elevated privileges on affected devices.

Critical Impact

A malicious application exploiting this race condition can achieve kernel-level code execution, potentially allowing complete system compromise, persistent malware installation, and unauthorized access to sensitive data across all affected Apple devices.

Affected Products

• Apple macOS Ventura (versions prior to 13.1)
• Apple macOS Monterey (versions prior to 12.6.2)
• Apple macOS Big Sur (versions prior to 11.7.2)
• Apple iOS and iPadOS (versions prior to 16.2 and 15.7.2)
• Apple tvOS (versions prior to 16.2)
• Apple watchOS (versions prior to 9.2)

Discovery Timeline

• December 15, 2022 - CVE-2022-46689 published to NVD
• April 21, 2025 - Last updated in NVD database

Technical Details for CVE-2022-46689

Vulnerability Analysis

This vulnerability is classified as CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization), commonly known as a race condition. The flaw resides in the kernel's handling of concurrent operations where validation checks and subsequent actions are not performed atomically.

In race condition vulnerabilities of this type, an attacker can manipulate the timing between when a security check is performed (time-of-check) and when the resource is actually used (time-of-use). By winning this race, the attacker can bypass security controls that would normally prevent unauthorized operations.

The local attack vector requirement means an attacker needs the ability to execute code on the target device, typically through a malicious application. Once the race is won, the application gains kernel privileges, which represents the highest level of access on Apple devices.

Root Cause

The root cause of CVE-2022-46689 is inadequate synchronization mechanisms in the kernel code path that handles certain operations. The vulnerability arises from a lack of proper locking or atomic operations when validating and processing requests, allowing an attacker to modify state between the validation check and the privileged operation.

Apple addressed this by implementing "additional validation" to ensure that the state checked during validation remains consistent through the execution of the privileged operation. This typically involves proper mutex locking, memory barriers, or restructuring the code to perform validation and action atomically.

Attack Vector

The attack requires local access to the device, meaning the attacker must first have the ability to run code on the target system. The most likely attack scenario involves:

1. A malicious application distributed through social engineering or potentially via a compromised legitimate application
2. The application creates multiple threads or processes to race against kernel validation routines
3. Through precise timing manipulation, the attacker wins the race condition
4. The application gains kernel-level execution privileges, bypassing normal sandbox restrictions

The vulnerability affects Apple's entire device ecosystem, making it particularly valuable for targeted attacks against individuals or organizations using Apple products.

Detection Methods for CVE-2022-46689

Indicators of Compromise

• Unusual kernel panic logs or system crashes that may indicate race condition exploitation attempts
• Applications attempting to spawn an abnormally high number of threads or processes in rapid succession
• Unexpected privilege escalation events in system audit logs
• Presence of unsigned or suspiciously signed applications exhibiting timing-sensitive behavior

Detection Strategies

• Monitor for applications making rapid, repeated system calls that could indicate race condition exploitation
• Implement behavioral analysis to detect applications attempting to access kernel-level resources without proper entitlements
• Deploy endpoint detection and response (EDR) solutions capable of detecting anomalous process behavior patterns
• Enable and review macOS Unified Logging for suspicious kernel extension loading or memory access patterns

Monitoring Recommendations

• Configure SentinelOne agents to monitor for behavioral indicators associated with privilege escalation attempts
• Enable kernel audit logging to capture detailed system call information for forensic analysis
• Implement real-time alerting for applications attempting kernel memory access or privilege escalation
• Regularly review device logs for patterns consistent with race condition exploitation attempts

How to Mitigate CVE-2022-46689

Immediate Actions Required

• Update all Apple devices to the patched versions: macOS Ventura 13.1, macOS Monterey 12.6.2, macOS Big Sur 11.7.2, iOS 16.2, iPadOS 16.2, iOS 15.7.2, iPadOS 15.7.2, tvOS 16.2, and watchOS 9.2
• Enable automatic software updates on all managed Apple devices to ensure timely patch deployment
• Restrict installation of applications to trusted sources only (App Store, enterprise MDM)
• Review and audit installed applications on affected devices for suspicious behavior

Patch Information

Apple has released security updates addressing this vulnerability across all affected platforms. The patches implement additional validation to prevent the race condition from being exploited. Detailed information is available in Apple's security advisories:

• Apple Support Article HT213530 - tvOS 16.2
• Apple Support Article HT213531 - watchOS 9.2
• Apple Support Article HT213532 - macOS Big Sur 11.7.2
• Apple Support Article HT213533 - macOS Monterey 12.6.2
• Apple Support Article HT213534 - iOS 15.7.2 and iPadOS 15.7.2
• Apple Support Article HT213535 - iOS 16.2 and iPadOS 16.2
• Apple Support Article HT213536 - macOS Ventura 13.1

Workarounds

• Implement strict application allowlisting to prevent unauthorized applications from executing
• Use Mobile Device Management (MDM) solutions to enforce security policies and restrict application installation
• Enable Gatekeeper on macOS to ensure only signed and notarized applications can run
• Consider network segmentation to limit the impact of potential device compromise