CVE-2024-44238: iOS 18.1 Buffer Overflow Vulnerability

CVE-2024-44238 Overview

CVE-2024-44238 is a memory corruption vulnerability affecting Apple iOS and iPadOS that allows a malicious application to corrupt coprocessor memory. The vulnerability stems from improper bounds checking, which Apple has addressed in iOS 18.1 and iPadOS 18.1. This local attack vector requires low privileges but can potentially lead to significant compromise of device integrity, confidentiality, and availability.

Critical Impact

A malicious application installed on the device could exploit insufficient bounds checking to corrupt coprocessor memory, potentially leading to arbitrary code execution or device compromise.

Affected Products

• iOS versions prior to 18.1
• iPadOS versions prior to 18.1
• Apple devices running vulnerable firmware with coprocessor components

Discovery Timeline

• 2026-01-16 - CVE CVE-2024-44238 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2024-44238

Vulnerability Analysis

This vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a memory corruption issue that occurs when software performs operations on a memory buffer without properly checking the boundaries of the input data. In this case, the vulnerability affects coprocessor memory management within Apple's mobile operating systems.

The local attack vector indicates that exploitation requires the attacker to have some form of application installed on the target device. Once a malicious app is running with low-level privileges, it can trigger the bounds checking flaw to write data beyond intended memory boundaries, corrupting coprocessor memory structures.

Coprocessors in Apple devices handle critical operations including secure enclave functions, motion processing, and other hardware-accelerated tasks. Corruption of coprocessor memory could potentially allow an attacker to manipulate hardware-level operations, bypass security controls, or achieve persistent compromise of the device.

Root Cause

The root cause is improper bounds validation when processing data that interacts with coprocessor memory regions. The application interface failed to adequately verify input sizes or memory offsets before performing operations, allowing out-of-bounds memory access.

Attack Vector

Exploitation of CVE-2024-44238 requires local access through a malicious application. The attack flow involves:

1. A malicious application is installed on the target iOS or iPadOS device
2. The application crafts specially formatted input designed to trigger the bounds checking vulnerability
3. When processed, the malformed input causes operations to exceed expected memory boundaries
4. The resulting memory corruption affects coprocessor memory regions
5. Depending on the specific memory structures corrupted, this could lead to code execution, privilege escalation, or device instability

The vulnerability does not require user interaction beyond the initial installation of the malicious application, making it particularly dangerous if combined with social engineering or supply chain attacks.

Detection Methods for CVE-2024-44238

Indicators of Compromise

• Unexpected application crashes or device instability following app installations
• Unusual coprocessor behavior or hardware component malfunctions
• Applications requesting unexpected permissions or exhibiting anomalous memory usage patterns
• System logs indicating memory access violations or kernel panics related to coprocessor operations

Detection Strategies

• Monitor for applications exhibiting unusual memory allocation patterns or accessing restricted memory regions
• Implement mobile device management (MDM) solutions to detect and block known malicious applications
• Review installed applications for suspicious behavior or unknown origins
• Utilize endpoint detection and response (EDR) solutions capable of monitoring mobile device activity

Monitoring Recommendations

• Enable comprehensive logging on managed iOS/iPadOS devices through MDM platforms
• Monitor application installation patterns and flag applications from untrusted sources
• Implement behavioral analysis to detect applications attempting unusual hardware interactions
• Regularly audit device firmware versions to ensure security updates are applied

How to Mitigate CVE-2024-44238

Immediate Actions Required

• Update all iOS devices to version 18.1 or later immediately
• Update all iPadOS devices to version 18.1 or later immediately
• Review installed applications and remove any from untrusted sources
• Implement application allowlisting through MDM to prevent installation of unauthorized apps

Patch Information

Apple has addressed this vulnerability with improved bounds checks in iOS 18.1 and iPadOS 18.1. Organizations should prioritize deployment of these updates across all managed Apple mobile devices. For detailed patch information, refer to the Apple Support Article.

Workarounds

• Restrict application installations to trusted App Store applications only
• Enable supervised mode on enterprise devices to maintain strict control over installed software
• Implement network-level controls to prevent communication with known malicious infrastructure
• Educate users about the risks of installing applications from untrusted sources or sideloading apps

For devices that cannot be immediately updated, enforcing strict application installation policies through MDM and monitoring for suspicious application behavior provides interim protection while patch deployment is coordinated.