CVE-2024-27829: Apple macOS Sonoma RCE Vulnerability

CVE-2024-27829 Overview

CVE-2024-27829 is a memory handling vulnerability in Apple macOS Sonoma that can be exploited when processing specially crafted files. The vulnerability stems from improper memory handling operations that can lead to unexpected application termination or, more critically, arbitrary code execution on affected systems. This issue was addressed by Apple with improved memory handling mechanisms in macOS Sonoma 14.5.

Critical Impact

Processing a maliciously crafted file can lead to arbitrary code execution, potentially allowing attackers to gain control of affected macOS systems with the privileges of the current user.

Affected Products

• Apple macOS Sonoma (versions prior to 14.5)
• macOS systems running unpatched versions of Sonoma

Discovery Timeline

• May 14, 2024 - CVE-2024-27829 published to NVD
• December 9, 2024 - Last updated in NVD database

Technical Details for CVE-2024-27829

Vulnerability Analysis

This vulnerability is classified under CWE-788 (Access of Memory Location After End of Buffer), indicating that the flaw involves memory access operations that extend beyond the intended buffer boundaries. When a user processes a maliciously crafted file, the vulnerable code path fails to properly validate memory boundaries, leading to out-of-bounds memory access.

The local attack vector requires user interaction—specifically, the victim must open or process a malicious file. Once triggered, the vulnerability can corrupt memory structures in ways that allow attackers to redirect program execution flow. The potential for arbitrary code execution makes this vulnerability particularly dangerous, as successful exploitation could allow an attacker to execute malicious code with the same privileges as the targeted application or user.

Root Cause

The root cause of CVE-2024-27829 lies in improper memory handling within macOS Sonoma's file processing subsystems. The vulnerability occurs when memory operations fail to properly track buffer boundaries during file parsing operations. This can result in access to memory locations beyond the intended buffer, leading to memory corruption that can be leveraged for code execution.

Apple's security advisory indicates the issue was resolved with "improved memory handling," suggesting that the fix involved adding proper bounds checking and memory validation routines to prevent out-of-bounds access during file processing operations.

Attack Vector

The attack requires local access and user interaction to exploit. An attacker would need to craft a malicious file and convince the target user to open or process it. The attack scenario typically involves:

1. Creating a specially crafted file designed to trigger the memory handling vulnerability
2. Delivering the malicious file to the target via email, web download, or file sharing
3. The victim opening or processing the file triggers the vulnerability
4. Successful exploitation leads to arbitrary code execution in the context of the application processing the file

The exploitation mechanism leverages the memory corruption caused by improper bounds checking to manipulate program execution flow and achieve code execution.

Detection Methods for CVE-2024-27829

Indicators of Compromise

• Unexpected application crashes when processing files from untrusted sources
• Abnormal memory consumption patterns in applications handling file operations
• Crash reports indicating memory corruption or access violations in file processing components
• Suspicious file artifacts with unusual structures designed to trigger parsing errors

Detection Strategies

• Monitor system logs for application crashes related to memory access violations during file operations
• Implement endpoint detection rules to identify unusual file processing behaviors
• Deploy SentinelOne's behavioral AI to detect exploitation attempts targeting memory corruption vulnerabilities
• Use application sandboxing and process isolation to contain potential exploitation attempts

Monitoring Recommendations

• Enable crash reporting and analysis on macOS endpoints to identify potential exploitation attempts
• Monitor for suspicious file downloads and processing activities from untrusted sources
• Implement network traffic analysis to detect delivery of potentially malicious files
• Review application logs for repeated crashes or abnormal termination events

How to Mitigate CVE-2024-27829

Immediate Actions Required

• Update macOS Sonoma to version 14.5 or later immediately
• Restrict file processing from untrusted sources until patching is complete
• Enable macOS Gatekeeper and ensure only signed applications are allowed to run
• Configure SentinelOne endpoints to block suspicious file-based attacks
• Educate users about the risks of opening files from unknown sources

Patch Information

Apple has released macOS Sonoma 14.5 to address this vulnerability. The patch implements improved memory handling to prevent the out-of-bounds memory access that enables exploitation. Administrators should prioritize deployment of this update across all affected systems.

Detailed patch information is available in the Apple Support Article. The security update was also announced on the Full Disclosure Mailing List.

Workarounds

• Avoid processing files from untrusted or unknown sources until the patch is applied
• Implement strict application whitelisting to limit which applications can process potentially dangerous file types
• Use macOS sandboxing features to restrict application access to system resources
• Consider using virtualized environments when processing files from untrusted sources
• Enable additional endpoint protection controls to detect and block exploitation attempts

To update macOS Sonoma to the patched version, users can navigate to System Settings, select General, then Software Update, and install macOS Sonoma 14.5 or later. Alternatively, administrators can use the following terminal command to check for and install updates:

# Check for available macOS updates
softwareupdate --list

# Install macOS Sonoma 14.5 update
softwareupdate --install "macOS Sonoma 14.5"

# Verify current macOS version after update
sw_vers