CVE-2024-27789: Apple iPadOS Information Disclosure Flaw

CVE-2024-27789 Overview

CVE-2024-27789 is a logic issue affecting multiple Apple operating systems including iOS, iPadOS, and macOS. The vulnerability stems from insufficient validation checks that allow a malicious application to bypass security controls and access user-sensitive data. Apple addressed this flaw through improved validation logic in security updates released across their operating system portfolio.

Critical Impact

A malicious application can exploit this logic flaw to gain unauthorized access to user-sensitive data, potentially exposing personal information, credentials, or other confidential data stored on affected devices.

Affected Products

• Apple iOS (versions prior to 16.7.8)
• Apple iPadOS (versions prior to 16.7.8)
• Apple macOS Monterey (versions prior to 12.7.5)
• Apple macOS Ventura (versions prior to 13.6.7)
• Apple macOS Sonoma (versions prior to 14.4)

Discovery Timeline

• 2024-05-14 - CVE-2024-27789 published to NVD
• 2024-12-09 - Last updated in NVD database

Technical Details for CVE-2024-27789

Vulnerability Analysis

This vulnerability is classified under CWE-922 (Insecure Storage of Sensitive Information), indicating that the underlying issue involves improper handling or protection of sensitive data within the affected Apple operating systems. The flaw exists in the logic that governs application access to protected user data.

The vulnerability requires local access to exploit, meaning an attacker must have a malicious application installed on the target device. When a user interacts with such an application, the flawed logic allows the app to circumvent the standard privacy controls that Apple implements to protect sensitive user information. This could include access to personal files, configuration data, or other protected information typically restricted from third-party applications.

The attack does not require elevated privileges to execute, but does require user interaction—specifically, the user must run or interact with a malicious application. The impact is primarily to confidentiality, as the vulnerability enables unauthorized data access without affecting system integrity or availability.

Root Cause

The root cause of CVE-2024-27789 is a logic error in the validation checks that govern application access to sensitive user data. Apple's security model relies on permission checks and sandboxing to prevent unauthorized data access. In this case, the validation logic contained a flaw that could be bypassed under certain conditions, allowing applications to access data they should not have permission to read.

Attack Vector

Exploitation of this vulnerability requires local access and user interaction. An attacker would need to convince a user to install and run a malicious application on their iOS, iPadOS, or macOS device. Once executed, the malicious application exploits the logic flaw to bypass permission checks and access sensitive user data that would normally be protected by the operating system's privacy controls.

The attack chain typically involves:

1. Distribution of a malicious application through social engineering or potentially compromising legitimate app distribution channels
2. User installation and execution of the malicious application
3. The application exploits the logic flaw to bypass data access controls
4. Sensitive user data is exfiltrated or misused by the attacker

Detection Methods for CVE-2024-27789

Indicators of Compromise

• Unusual application behavior accessing protected directories or data stores outside normal application scope
• Unexpected data access patterns from third-party applications targeting user-sensitive locations
• Applications attempting to read from protected system paths or user data containers without appropriate entitlements

Detection Strategies

• Monitor for applications accessing sensitive user data locations without proper entitlements or permissions
• Implement behavioral analysis to detect anomalous data access patterns from installed applications
• Use endpoint detection solutions to identify applications attempting to bypass sandbox restrictions
• Review application behavior logs for unauthorized access attempts to protected resources

Monitoring Recommendations

• Enable enhanced logging for file system access events on sensitive data directories
• Deploy SentinelOne agents across macOS and mobile device management solutions for iOS/iPadOS devices
• Implement application whitelisting policies to restrict execution of untrusted applications
• Monitor for applications requesting unusual permission combinations that could facilitate data exfiltration

How to Mitigate CVE-2024-27789

Immediate Actions Required

• Update all Apple devices to the patched versions: iOS 16.7.8, iPadOS 16.7.8, macOS Monterey 12.7.5, macOS Ventura 13.6.7, or macOS Sonoma 14.4
• Audit installed applications and remove any untrusted or suspicious applications from affected devices
• Enable automatic updates to ensure timely deployment of security patches
• Review Mobile Device Management (MDM) policies to enforce application installation restrictions

Patch Information

Apple has released security updates addressing CVE-2024-27789 across multiple product lines. Organizations should prioritize deployment of these updates:

• iOS 16.7.8 and iPadOS 16.7.8 - Apple Support Article HT214107
• macOS Monterey 12.7.5 - Apple Support Article HT214105
• macOS Ventura 13.6.7 - Apple Support Article HT214100
• macOS Sonoma 14.4 - Apple Support Article HT214084

For additional technical details, refer to the Full Disclosure Post May 14 2024.

Workarounds

• Restrict installation of applications to trusted sources only (Mac App Store, managed enterprise distribution)
• Implement application sandboxing policies via MDM to limit data access capabilities
• Enable FileVault encryption on macOS to add an additional layer of protection for sensitive data
• Use SentinelOne Singularity Platform to detect and prevent malicious application behavior that may attempt to exploit this vulnerability

# Verify macOS version to confirm patch status
sw_vers -productVersion

# Check for pending software updates
softwareupdate --list

# Install all available updates
softwareupdate --install --all