CVE-2022-32863 Overview
CVE-2022-32863 is a memory corruption vulnerability affecting Apple Safari and macOS Monterey. The flaw allows attackers to achieve arbitrary code execution when a victim processes maliciously crafted web content. Apple addressed the issue with improved state management in Safari 15.6 and macOS Monterey 12.5.
The vulnerability is classified under [CWE-787] (Out-of-bounds Write) and carries a network attack vector requiring no privileges or user interaction beyond viewing attacker-controlled content. Apple published the corresponding advisories on July 20, 2022, and the CVE was added to the National Vulnerability Database on September 20, 2022.
Critical Impact
Remote attackers can execute arbitrary code on vulnerable systems by enticing users to load crafted web content through Safari or WebKit-based components on macOS Monterey.
Affected Products
- Apple Safari versions prior to 15.6
- Apple macOS Monterey versions prior to 12.5
- WebKit-based components on affected macOS releases
Discovery Timeline
- 2022-09-20 - CVE-2022-32863 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2022-32863
Vulnerability Analysis
The vulnerability is a memory corruption issue rooted in improper state management within the affected Safari and macOS components. Apple categorizes the fix as "improved state management," indicating that internal object or execution state was not consistently tracked during web content processing. When inconsistent state is reached, the engine performs an out-of-bounds write, corrupting adjacent memory structures.
Memory corruption in a browser engine typically enables an attacker to overwrite function pointers, virtual table entries, or sensitive metadata. The result is arbitrary code execution within the renderer process. From that foothold, attackers commonly chain a sandbox escape to gain broader system access on macOS.
The vulnerability is associated with EPSS probability 1.072% at percentile 77.959, indicating measurable exploitation likelihood relative to the broader CVE population.
Root Cause
The root cause is an out-of-bounds write [CWE-787] triggered by inconsistent state handling during the processing of attacker-controlled web content. The affected code paths failed to validate state transitions before performing memory writes, allowing crafted input to drive the engine into a condition where writes occurred outside the bounds of an intended buffer or object.
Attack Vector
Exploitation requires a victim to visit or load a malicious web page in Safari or another WebKit-backed surface on macOS Monterey. No authentication and no additional privileges are required. Common delivery channels include phishing links, compromised legitimate sites, and malicious advertisements served through ad networks.
The vulnerability is exploited remotely over the network and operates entirely client-side. No verified public proof-of-concept code is available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog.
For technical details on the fix, refer to the Apple Support Document HT213341 and Apple Support Document HT213345.
Detection Methods for CVE-2022-32863
Indicators of Compromise
- Unexpected Safari or com.apple.WebKit.WebContent process crashes accompanied by crash logs referencing out-of-bounds writes or memory corruption signatures.
- Spawning of shell utilities (bash, zsh, osascript) as child processes of Safari or WebKit content processes.
- Outbound network connections from Safari renderer processes to unfamiliar domains immediately following web content rendering.
Detection Strategies
- Inventory Safari and macOS Monterey versions across the fleet and flag endpoints running builds older than Safari 15.6 or macOS 12.5.
- Monitor endpoint telemetry for renderer process crashes correlated with browsing activity, which can indicate exploitation attempts or unstable exploit chains.
- Apply behavioral detection rules that flag post-exploitation activity such as persistence creation, LaunchAgent modification, or unsigned binary execution following browser activity.
Monitoring Recommendations
- Centralize browser and macOS crash logs (~/Library/Logs/DiagnosticReports/) and alert on repeated WebContent crashes from the same host or URL.
- Track DNS and HTTP telemetry to identify visits to known malicious or newly registered domains hosting exploit content.
- Correlate web proxy logs with endpoint process trees to detect anomalous child process creation from browser parents.
How to Mitigate CVE-2022-32863
Immediate Actions Required
- Upgrade Safari to version 15.6 or later on all macOS endpoints.
- Upgrade macOS Monterey to version 12.5 or later to remediate the underlying WebKit-related components.
- Validate patch deployment through software inventory and configuration management tooling.
Patch Information
Apple released patches in Safari 15.6 and macOS Monterey 12.5. Refer to the Apple Support Document HT213341 for macOS Monterey 12.5 details and Apple Support Document HT213345 for Safari 15.6 release information. The Apple Support Document HT213346 provides additional technical context.
Workarounds
- Restrict use of Safari on unpatched endpoints and route browsing through patched alternatives until updates are applied.
- Enforce web content filtering and block access to untrusted sites at the network perimeter to reduce exposure to malicious payloads.
- Apply least-privilege account configurations on macOS systems to limit the impact of a successful renderer compromise.
# Verify installed macOS and Safari versions
sw_vers -productVersion
defaults read /Applications/Safari.app/Contents/Info.plist CFBundleShortVersionString
# Trigger software update check
sudo softwareupdate --list
sudo softwareupdate --install --all --restart
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
