CVE-2024-44206: Apple Safari Auth Bypass Vulnerability

CVE-2024-44206 Overview

CVE-2024-44206 is a URL protocol handling vulnerability affecting Apple Safari and multiple Apple operating systems. The flaw allows attackers to bypass web content restrictions enforced by the browser through improper handling of URL protocols. Apple addressed the issue with improved logic in Safari 17.6, iOS 17.6, iPadOS 17.6, macOS Sonoma 14.6, tvOS 17.6, visionOS 1.3, and watchOS 10.6. Successful exploitation requires no privileges and no user interaction, and the attack can be delivered remotely over the network. The vulnerability impacts confidentiality and integrity by enabling content restriction bypass across browser security boundaries.

Critical Impact

A remote attacker can bypass Safari web content restrictions through crafted URL protocol handling, potentially exposing sensitive browser-enforced security boundaries without user interaction.

Affected Products

• Apple Safari (prior to 17.6)
• Apple iOS and iPadOS (prior to 17.6)
• Apple macOS Sonoma (prior to 14.6), tvOS (prior to 17.6), visionOS (prior to 1.3)

Discovery Timeline

• 2024-10-24 - CVE-2024-44206 published to NVD
• 2026-04-02 - Last updated in NVD database

Technical Details for CVE-2024-44206

Vulnerability Analysis

The vulnerability resides in how Safari and underlying Apple operating systems parse and dispatch URL protocols. When the browser processes a specially crafted URL, the protocol handler fails to enforce expected web content restrictions. This allows an attacker-controlled page or link to circumvent security policies that normally constrain navigation, scheme handling, or cross-context content loading.

The issue is classified under [NVD-CWE-noinfo] because Apple has not published low-level technical specifics. According to the vendor advisory, the fix was implemented through improved protocol-handling logic, suggesting the original code path made incorrect trust or scope decisions when interpreting non-standard or composite URL schemes.

The EPSS probability for active exploitation stands at 0.538%. No public proof-of-concept exploit has been published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Root Cause

The root cause is insufficient validation within Safari's URL protocol dispatcher. The handler accepted protocol structures that should have triggered restriction enforcement but instead passed through normal processing. Apple's remediation describes the change as "improved logic," indicating a defect in conditional checks rather than a memory safety issue.

Attack Vector

An attacker hosts a malicious web page or delivers a crafted link through email, messaging, or advertising networks. When a victim's Safari client loads the URL, the protocol handler misinterprets the request and allows content or navigation that bypasses Safari's web restriction policies. No authentication or user prompt is required beyond initial URL loading. The scope changes because the bypass affects security boundaries beyond the browser tab originating the request.

No verified proof-of-concept code is available. Refer to the Full Disclosure Mailing List Post for community discussion and to Apple's advisories for vendor-confirmed details.

Detection Methods for CVE-2024-44206

Indicators of Compromise

• Safari telemetry showing navigation to URLs containing unusual or nested protocol schemes (e.g., chained javascript:, data:, file:, or custom app schemes).
• Browser process activity loading content from domains not matching the user-visible address bar origin.
• Unexpected invocation of registered URL handlers immediately after Safari navigation events.

Detection Strategies

• Monitor endpoint logs for Safari child processes spawning unexpected helper applications following URL navigation.
• Inspect web proxy and DNS logs for traffic to known malicious infrastructure delivering crafted protocol payloads.
• Correlate Safari version inventory with vulnerability scanner output to identify hosts running pre-17.6 builds.

Monitoring Recommendations

• Track Safari and Apple OS versions across managed devices using MDM reporting to confirm patch deployment.
• Alert on outbound network traffic from Safari that does not correspond to user-initiated navigation.
• Review macOS Unified Logging entries from com.apple.Safari and WebKit subsystems for anomalous URL handling errors.

How to Mitigate CVE-2024-44206

Immediate Actions Required

• Update Safari to version 17.6 or later on all macOS endpoints.
• Upgrade iOS and iPadOS devices to 17.6, macOS to Sonoma 14.6, tvOS to 17.6, visionOS to 1.3, and watchOS to 10.6.
• Enforce minimum OS version requirements through MDM compliance policies before allowing corporate resource access.
• Audit installed third-party browsers and ensure they also receive timely security updates.

Patch Information

Apple released fixes across all affected platforms. Apply the updates documented in Apple Support Document 120909, Apple Support Document 120911, Apple Support Document 120913, Apple Support Document 120914, Apple Support Document 120915, and Apple Support Document 120916.

Workarounds

• Restrict use of Safari on unpatched devices and direct users to a fully patched alternative browser until updates are applied.
• Block known malicious domains and suspicious URL schemes at the network egress and secure web gateway layer.
• Disable automatic handling of non-standard URL schemes through configuration profiles where feasible.

# Verify Safari version on macOS
defaults read /Applications/Safari.app/Contents/Info.plist CFBundleShortVersionString

# Check macOS build version
sw_vers -productVersion

# Trigger a software update check via MDM or local command
sudo softwareupdate --install --all --restart