CVE-2022-22590: Apple Safari RCE Vulnerability

CVE-2022-22590 Overview

CVE-2022-22590 is a use-after-free vulnerability in Apple's WebKit browser engine that enables arbitrary code execution through maliciously crafted web content. This memory corruption vulnerability affects a wide range of Apple products including Safari, iOS, iPadOS, macOS, tvOS, and watchOS, as well as WebKitGTK implementations on other platforms.

The vulnerability stems from improper memory management within WebKit, where freed memory can be subsequently accessed, potentially allowing attackers to execute arbitrary code in the context of the affected application. Successful exploitation requires user interaction, specifically visiting a malicious website or processing attacker-controlled web content.

Critical Impact

Processing maliciously crafted web content may lead to arbitrary code execution, potentially compromising the entire device or system.

Affected Products

• Apple Safari (versions prior to 15.3)
• Apple iOS and iPadOS (versions prior to 15.3)
• Apple macOS Monterey (versions prior to 12.2)
• Apple tvOS (versions prior to 15.3)
• Apple watchOS (versions prior to 8.4)
• WebKitGTK (affected versions)

Discovery Timeline

• 2022-03-18 - CVE-2022-22590 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-22590

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption vulnerability that occurs when a program continues to reference memory after it has been freed. In the context of WebKit, the browser's rendering engine, this creates a dangerous condition where an attacker can manipulate how memory is allocated and used during the processing of web content.

When a user visits a specially crafted webpage, the vulnerability can be triggered through malformed HTML, JavaScript, or other web content that causes WebKit to access memory that has already been deallocated. At this point, the attacker can potentially control what data resides in that memory location, leading to arbitrary code execution with the privileges of the WebKit process.

The network-based attack vector combined with the requirement for user interaction (visiting a malicious webpage) represents a common browser exploitation scenario. Once exploited, an attacker could achieve complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of CVE-2022-22590 lies in improper memory management within WebKit's processing of web content. Specifically, a memory object is freed prematurely while references to that memory still exist within the application. When WebKit subsequently attempts to use this stale reference, it accesses freed memory, which may have been reallocated for other purposes or filled with attacker-controlled data.

Use-after-free vulnerabilities in browser engines are particularly dangerous because:

• Web content is inherently untrusted and processed frequently
• Browser engines handle complex document object models with many interdependent objects
• JavaScript execution can trigger timing-sensitive memory operations
• Successful exploitation often leads to renderer process compromise

Attack Vector

The attack vector for CVE-2022-22590 is network-based, requiring an attacker to host malicious web content and entice a victim to access it. Attack scenarios include:

• Hosting malicious content on a compromised or attacker-controlled website
• Injecting malicious content through advertising networks or third-party scripts
• Distributing malicious links through phishing campaigns
• Leveraging cross-site scripting vulnerabilities on legitimate sites to deliver exploit payloads

The vulnerability can be triggered when the victim's browser processes specially crafted web content. The attacker must craft content that creates a specific memory state where freed memory is accessed, allowing for manipulation of program execution flow.

Detection Methods for CVE-2022-22590

Indicators of Compromise

• Unexpected browser crashes or instability when visiting certain websites
• Unusual process behavior or child process spawning from Safari or WebKit-based applications
• Evidence of memory corruption in system crash logs or diagnostic reports
• Suspicious network connections initiated from browser processes to unknown destinations

Detection Strategies

• Monitor for abnormal WebKit process behavior including unexpected memory access patterns
• Implement network intrusion detection rules to identify known exploit patterns targeting WebKit vulnerabilities
• Deploy endpoint detection solutions capable of identifying use-after-free exploitation attempts
• Review browser crash reports for patterns indicative of memory corruption attacks

Monitoring Recommendations

• Enable detailed logging for Safari and WebKit-based applications on enterprise-managed devices
• Configure SIEM solutions to correlate browser crashes with network activity to identify potential exploitation attempts
• Implement web proxy logging to track access to suspicious or newly registered domains
• Monitor for indicators of post-exploitation activity following browser compromise

How to Mitigate CVE-2022-22590

Immediate Actions Required

• Update all Apple devices to the patched versions: iOS 15.3, iPadOS 15.3, watchOS 8.4, tvOS 15.3, Safari 15.3, and macOS Monterey 12.2
• For WebKitGTK users, update to the latest patched version as recommended by your distribution
• Enable automatic updates on all Apple devices to receive security patches promptly
• Consider using alternative browsers on unpatched systems until updates can be applied

Patch Information

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

• iOS and iPadOS: Update to version 15.3 or later - Apple Security Update HT213053
• Safari: Update to version 15.3 or later - Apple Security Update HT213054
• macOS Monterey: Update to version 12.2 or later - Apple Security Update HT213057
• watchOS: Update to version 8.4 or later - Apple Security Update HT213058
• tvOS: Update to version 15.3 or later - Apple Security Update HT213059

For Linux distributions using WebKitGTK, refer to the Gentoo GLSA 202208-39 advisory and your distribution's security updates.

Workarounds

• Disable JavaScript in browsers where updating is not immediately possible (may impact functionality)
• Use content security policies to restrict web content from untrusted sources
• Implement network-level filtering to block access to known malicious domains
• Consider using browser isolation technologies for high-risk browsing activities

# Verify Safari version on macOS
/Applications/Safari.app/Contents/MacOS/Safari --version

# Check macOS version for patch status
sw_vers -productVersion

# Enable automatic updates on macOS
sudo softwareupdate --schedule on