CVE-2022-42837: Apple iPadOS URL Parsing RCE Vulnerability

CVE-2022-42837 Overview

CVE-2022-42837 is a critical improper input validation vulnerability affecting Apple's URL parsing functionality across multiple operating systems. The vulnerability exists due to insufficient validation when parsing URL data, which can be exploited by remote attackers to cause unexpected application termination or achieve arbitrary code execution on vulnerable devices.

This flaw impacts a wide range of Apple devices including iPhones, iPads, Mac computers, and Apple Watch, making it a significant security concern for enterprise and consumer environments alike. The network-based attack vector requires no user interaction or authentication, significantly lowering the barrier to exploitation.

Critical Impact

Remote attackers can exploit this URL parsing flaw to execute arbitrary code or crash applications on vulnerable Apple devices without requiring user interaction or authentication.

Affected Products

• Apple iOS (versions prior to 15.7.2 and 16.2)
• Apple iPadOS (versions prior to 15.7.2 and 16.2)
• Apple macOS Ventura (versions prior to 13.1)
• Apple watchOS (versions prior to 9.2)

Discovery Timeline

• December 15, 2022 - CVE-2022-42837 published to NVD
• April 21, 2025 - Last updated in NVD database

Technical Details for CVE-2022-42837

Vulnerability Analysis

This vulnerability stems from improper input validation (CWE-20) within Apple's URL parsing components. When processing specially crafted URL data, the affected systems fail to properly validate input boundaries and data integrity, creating conditions that can be exploited for code execution or denial of service attacks.

The vulnerability is particularly dangerous because URL parsing is a fundamental operation performed across numerous system components and applications. Any feature that processes URLs—including web browsers, messaging applications, email clients, and system services—could potentially serve as an attack surface.

The network-accessible nature of this vulnerability means attackers can craft malicious URLs and deliver them through various channels such as web pages, emails, messages, or any other medium that processes URL data on the target device.

Root Cause

The root cause of CVE-2022-42837 lies in insufficient input validation within the URL parsing logic. The parsing routines did not adequately verify the structure, length, and content of URL components before processing, allowing malformed or specially crafted URL strings to trigger memory corruption or logic errors.

Apple addressed this issue by implementing improved input validation to ensure that URL data is properly sanitized and validated before being processed by system components.

Attack Vector

The attack vector for CVE-2022-42837 is network-based, allowing remote exploitation without requiring local access to the target device. An attacker can exploit this vulnerability by:

1. Crafting a malicious URL with specially formatted content designed to trigger the parsing vulnerability
2. Delivering the malicious URL to the victim through various channels (web links, messages, emails, or embedded in applications)
3. When the vulnerable device processes the URL, the parsing flaw is triggered
4. Successful exploitation results in either application crashes (denial of service) or arbitrary code execution

The vulnerability requires no user interaction or authentication, and can potentially be triggered simply by having a vulnerable application or system service process the malicious URL data.

Detection Methods for CVE-2022-42837

Indicators of Compromise

• Unexpected application crashes, particularly in applications that process URL data (Safari, Mail, Messages)
• Abnormal system behavior following interaction with untrusted web content or messages
• Unusual network traffic patterns indicating potential exploitation attempts
• Core dump files indicating memory corruption in URL parsing components

Detection Strategies

• Monitor for unusual application terminations across Apple devices, especially in URL-handling processes
• Implement network traffic analysis to detect malformed URL patterns in inbound traffic
• Deploy endpoint detection solutions capable of identifying exploitation attempts targeting URL parsing
• Review system logs for crash reports related to URL processing components

Monitoring Recommendations

• Enable crash reporting and analysis on all managed Apple devices to identify potential exploitation attempts
• Implement Mobile Device Management (MDM) solutions to maintain visibility into device health and security status
• Monitor for security updates from Apple and ensure timely deployment across the fleet
• Utilize SentinelOne Singularity Mobile to detect and prevent exploitation attempts on iOS and macOS endpoints

How to Mitigate CVE-2022-42837

Immediate Actions Required

• Update all affected Apple devices to the patched versions immediately (iOS 15.7.2+, iOS 16.2+, iPadOS 15.7.2+, iPadOS 16.2+, macOS Ventura 13.1+, watchOS 9.2+)
• Prioritize patching for devices with network exposure or those used to access sensitive resources
• Implement network-level controls to filter potentially malicious traffic while patches are deployed
• Review and restrict unnecessary URL handling permissions in applications where possible

Patch Information

Apple has released security updates addressing this vulnerability across all affected platforms. Organizations should apply the following updates:

• iOS 16.2 and iPadOS 16.2: See Apple Security Advisory HT213530
• macOS Ventura 13.1: See Apple Security Advisory HT213532
• iOS 15.7.2 and iPadOS 15.7.2: See Apple Security Advisory HT213531
• watchOS 9.2: See Apple Security Advisory HT213536

Additional technical details are available in the Full Disclosure archives.

Workarounds

• Limit exposure by restricting access to untrusted websites and links until patches can be applied
• Use network security controls to inspect and filter URL-based traffic at the perimeter
• Configure MDM policies to restrict application capabilities that involve URL processing where feasible
• Educate users about the risks of clicking unknown links or visiting untrusted websites

# Check current iOS/iPadOS version via MDM or device
# Settings > General > About > Software Version
# Ensure version is 15.7.2+ or 16.2+ for iOS/iPadOS

# For macOS, verify version via Terminal
sw_vers -productVersion
# Ensure output shows 13.1 or higher for macOS Ventura