CVE-2024-23258: Apple macOS Out-of-Bounds Read RCE Flaw

CVE-2024-23258 Overview

CVE-2024-23258 is an out-of-bounds read vulnerability [CWE-125] affecting Apple macOS and visionOS image processing components. Processing a maliciously crafted image can lead to arbitrary code execution on the target system. Apple addressed the flaw with improved input validation in macOS Sonoma 14.4 and visionOS 1.1. The vulnerability requires local access and user interaction, typically achieved by convincing a user to open a specially crafted image file.

Critical Impact
Successful exploitation allows arbitrary code execution in the context of the process handling the image, with high impact on confidentiality, integrity, and availability.

Affected Products

Apple macOS versions prior to Sonoma 14.4
Apple visionOS versions prior to 1.1
Applications relying on the vulnerable macOS and visionOS image processing components

Discovery Timeline

2024-03-08 - CVE-2024-23258 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-23258

Vulnerability Analysis

The vulnerability is an out-of-bounds read in image processing code shipped with macOS and visionOS. When the operating system parses a malformed image, the parser reads memory beyond the bounds of the intended buffer. Attackers can shape the malformed data so that the resulting memory disclosure and control-flow deviation lead to arbitrary code execution rather than a simple crash.

Apple's advisories for macOS Sonoma 14.4 and visionOS 1.1 confirm the fix applied improved input validation before dereferencing image metadata and pixel data structures. Refer to the Apple Support Document HT214084 and Apple Support Document HT214087 for the vendor description.

Root Cause

The root cause is insufficient validation of attacker-controlled fields in image file structures. The parser trusts length or offset values embedded in the image without verifying them against the allocated buffer size. This allows a crafted file to force a read past the end of the buffer, exposing adjacent memory and enabling further exploitation primitives.

Attack Vector

Exploitation requires local delivery of a crafted image and user interaction to open or preview it. Common delivery paths include email attachments, chat clients, web downloads, and shared documents that embed images. Because macOS applications frequently render image thumbnails and previews automatically, minimal user interaction can be sufficient to reach the vulnerable code path.

No verified public proof-of-concept code is available for CVE-2024-23258. See the Full Disclosure Mailing - March 21, 2024 and Full Disclosure Mailing - March 26, 2024 for related discussion of the March 2024 Apple advisories.

Detection Methods for CVE-2024-23258

Indicators of Compromise

Unexpected crashes or spikes in memory usage in processes that handle image rendering, such as Preview, QuickLook, and Finder thumbnail workers
Crash reports in ~/Library/Logs/DiagnosticReports/ referencing image parsing frameworks on unpatched macOS versions
Suspicious image files delivered via email, messaging, or web downloads that trigger repeated preview failures

Detection Strategies

Inventory macOS and visionOS endpoints and flag any device running builds earlier than macOS Sonoma 14.4 or visionOS 1.1
Monitor endpoint telemetry for image-handling processes spawning shells, scripting interpreters, or unexpected child processes
Correlate delivery of image attachments with subsequent process anomalies on the receiving endpoint

Monitoring Recommendations

Forward macOS unified logs and crash reports to a central data lake for retention and analytics
Alert on repeated crashes of QuickLookUIService, Preview, or other image-rendering processes on the same host
Track patch compliance for macOS Sonoma 14.4 and visionOS 1.1 across the fleet and escalate stale endpoints

How to Mitigate CVE-2024-23258

Immediate Actions Required

Update all macOS endpoints to macOS Sonoma 14.4 or later
Update Apple Vision Pro devices to visionOS 1.1 or later
Restrict opening or previewing untrusted image files on unpatched systems until updates are applied
Validate patch compliance across the fleet and prioritize systems handling untrusted external content

Patch Information

Apple released fixes for CVE-2024-23258 in macOS Sonoma 14.4 and visionOS 1.1 by improving input validation in the affected image processing code. Refer to the vendor advisories at Apple Support Article 120883 and Apple Support Article 120895 for detailed release notes and installation guidance.

Workarounds

Disable automatic image previews and thumbnail generation in mail clients and file browsers where feasible
Route inbound attachments through a sandboxed gateway that rerenders images to a safe format before delivery
Educate users to avoid opening image files from unknown or untrusted senders on systems that cannot be immediately patched

bash

# Verify installed macOS version and confirm patch level
sw_vers -productVersion

# Trigger a software update check and install available updates
sudo softwareupdate --list
sudo softwareupdate --install --all --restart