CVE-2022-32863: Apple Safari RCE Vulnerability

CVE-2022-32863 Overview

CVE-2022-32863 is a memory corruption vulnerability affecting Apple Safari and macOS Monterey. The flaw exists in the state management mechanism and can be exploited when processing maliciously crafted web content, potentially leading to arbitrary code execution. This vulnerability was addressed by Apple with improved state management in Safari 15.6 and macOS Monterey 12.5.

Critical Impact

Processing maliciously crafted web content may lead to arbitrary code execution with the privileges of the user running the browser, potentially allowing full system compromise without user interaction beyond visiting a malicious website.

Affected Products

• Apple Safari versions prior to 15.6
• Apple macOS Monterey versions prior to 12.5

Discovery Timeline

• September 20, 2022 - CVE-2022-32863 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-32863

Vulnerability Analysis

This vulnerability is classified as CWE-787 (Out-of-Bounds Write), indicating that the application writes data past the end of an allocated memory buffer. The memory corruption issue stems from improper state management within the web content processing engine. When a user visits a website containing specially crafted malicious content, the vulnerable components fail to properly validate or manage memory states during processing operations.

The network-based attack vector requires no authentication or user privileges, meaning any user who simply browses to a malicious website could be affected. The impact is severe across all three security domains: confidentiality, integrity, and availability are all fully compromised if exploitation succeeds.

Root Cause

The vulnerability originates from improper state management in the web content processing components shared between Safari and macOS. When handling certain maliciously crafted web content, the application fails to properly track memory state transitions, leading to out-of-bounds write conditions. This allows an attacker to corrupt adjacent memory regions, potentially overwriting critical data structures or code pointers.

Attack Vector

The attack is delivered via network through malicious web content. An attacker can host or inject malicious content on a web page that, when processed by a vulnerable Safari browser or WebKit-based application on macOS Monterey, triggers the memory corruption. The exploitation path follows these general steps:

1. Attacker crafts malicious web content designed to trigger improper state management
2. Victim visits the malicious webpage or a compromised legitimate site
3. The browser processes the content, triggering the out-of-bounds write condition
4. Memory corruption occurs, allowing the attacker to gain code execution
5. Arbitrary code runs with the privileges of the browser process

The vulnerability mechanism involves the browser's rendering engine mishandling specific sequences of operations that manipulate object states. When the state transition logic fails to account for edge cases, memory writes can occur outside the bounds of allocated buffers. For detailed technical information, refer to Apple's security advisory HT213341.

Detection Methods for CVE-2022-32863

Indicators of Compromise

• Unexpected Safari or WebKit process crashes with memory access violations
• Anomalous child process spawning from Safari or browser-related processes
• Unusual network connections initiated by browser processes to unknown command and control servers
• Memory access errors or segmentation faults in system logs associated with web browsing activity

Detection Strategies

• Monitor for Safari and WebKit crash reports indicating memory corruption or out-of-bounds access
• Implement endpoint detection rules to identify suspicious process behavior following web browsing activity
• Deploy network-based detection for known malicious payloads targeting WebKit vulnerabilities
• Utilize SentinelOne's behavioral AI to detect anomalous code execution patterns originating from browser processes

Monitoring Recommendations

• Enable detailed logging for Safari and WebKit processes on all macOS endpoints
• Configure crash report collection and analysis for browser-related processes
• Monitor for privilege escalation attempts following browser process execution
• Implement real-time alerting for memory corruption indicators on managed devices

How to Mitigate CVE-2022-32863

Immediate Actions Required

• Update Safari to version 15.6 or later immediately
• Update macOS Monterey to version 12.5 or later
• Restrict access to untrusted websites until patches are applied
• Consider using alternative browsers temporarily on unpatched systems
• Enable automatic updates to ensure future security patches are applied promptly

Patch Information

Apple has released patches addressing this vulnerability in Safari 15.6 and macOS Monterey 12.5. Organizations should prioritize updating all affected systems. Detailed patch information is available in Apple Support Article HT213341 for macOS Monterey and Apple Support Article HT213345 for Safari. Additional related security updates are documented in Apple Support Article HT213346.

Workarounds

• Disable JavaScript in Safari via Preferences > Security > uncheck "Enable JavaScript" (note: this significantly impacts web functionality)
• Use content blockers to prevent loading of potentially malicious web content
• Implement network-level filtering to block access to known malicious domains
• Consider sandboxing browser processes with additional restrictions until patching is complete

# Check current Safari version on macOS
/usr/bin/defaults read /Applications/Safari.app/Contents/Info.plist CFBundleShortVersionString

# Check macOS version
sw_vers -productVersion

# Trigger software update check
softwareupdate --list

# Install all available updates
sudo softwareupdate --install --all