CVE-2025-31191: Apple iPadOS Information Disclosure Flaw

CVE-2025-31191 Overview

CVE-2025-31191 is a security vulnerability affecting Apple's operating systems including macOS, iOS, iPadOS, and tvOS. The issue stems from improper state management in the handling of security-scoped bookmarks, which allows a malicious application to bypass sandbox restrictions and access sensitive user data without proper authorization.

Microsoft's security research team published a detailed analysis identifying this as a sandbox escape vulnerability that exploits weaknesses in how macOS handles security-scoped bookmarks. These bookmarks are designed to allow sandboxed applications to retain access to user-selected files across app launches, but the flawed state management implementation allowed malicious apps to abuse this mechanism.

Critical Impact

A malicious application can escape sandbox restrictions and access sensitive user data, potentially compromising user privacy and data confidentiality across all major Apple platforms.

Affected Products

• Apple macOS Ventura (versions prior to 13.7.5)
• Apple macOS Sonoma (versions prior to 14.7.5)
• Apple macOS Sequoia (versions prior to 15.4)
• Apple iOS and iPadOS (versions prior to 18.4)
• Apple tvOS (versions prior to 18.4)

Discovery Timeline

• 2025-03-31 - CVE-2025-31191 published to NVD
• 2025-05-01 - Microsoft publishes detailed security analysis
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-31191

Vulnerability Analysis

This vulnerability represents an information exposure flaw (CWE-200) within Apple's security-scoped bookmarks implementation. Security-scoped bookmarks are a macOS feature that enables sandboxed applications to maintain persistent access to files or folders that users have explicitly granted permission to access. The vulnerability exists because of improper state management in how these bookmarks are processed and validated.

According to Microsoft's security analysis, the flaw allows a malicious application to craft or manipulate security-scoped bookmarks in a way that bypasses the intended sandbox restrictions. This enables unauthorized access to sensitive user data that should be protected by the sandbox.

The attack requires local access and user interaction, as the victim must run a malicious application. However, once executed, the application can access confidential data outside its sandbox container, leading to high confidentiality impact.

Root Cause

The root cause of CVE-2025-31191 lies in the improper state management within the security-scoped bookmarks subsystem. Apple's advisory confirms the issue was addressed through "improved state management," indicating that the bookmark validation and state tracking mechanisms failed to properly enforce sandbox boundaries under certain conditions.

The security-scoped bookmarks feature maintains state information about which files an application has been granted access to. The vulnerability allowed this state to be manipulated or bypassed, enabling unauthorized file system access.

Attack Vector

The attack vector for this vulnerability is local, requiring an attacker to deliver a malicious application to the target system. The attack proceeds as follows:

1. The attacker creates a malicious application that exploits the security-scoped bookmarks vulnerability
2. The victim downloads and executes the malicious application (user interaction required)
3. The application manipulates or abuses the security-scoped bookmarks mechanism
4. The sandbox restrictions are bypassed, granting access to sensitive user data
5. The attacker's application can now read confidential information outside its intended sandbox scope

The vulnerability does not require elevated privileges to exploit, but does require the user to run the malicious application. Once exploited, it allows high confidentiality impact with the potential to access sensitive user data including documents, photos, and other personal files.

Detection Methods for CVE-2025-31191

Indicators of Compromise

• Unusual file access patterns from sandboxed applications attempting to read files outside their container
• Applications accessing security-scoped bookmark APIs with abnormal parameters or frequencies
• Unexpected file system access events from applications that should be restricted by sandbox policies
• Log entries showing bookmark resolution to paths outside the application's granted permissions

Detection Strategies

• Monitor sandboxd logs for sandbox violation attempts related to file system access
• Implement file integrity monitoring on sensitive user data directories to detect unauthorized access
• Use endpoint detection to identify applications exhibiting suspicious bookmark manipulation behavior
• Review system logs for unusual com.apple.security.files.bookmarks.app-scope entitlement usage

Monitoring Recommendations

• Enable comprehensive logging for file system access events, particularly from sandboxed applications
• Deploy SentinelOne agents configured to monitor for sandbox escape behaviors and anomalous data access patterns
• Implement alerting for applications attempting to access files outside their designated sandbox containers
• Regularly audit installed applications for unexpected entitlements or permission requests

How to Mitigate CVE-2025-31191

Immediate Actions Required

• Update all Apple devices to the latest patched versions: macOS Ventura 13.7.5, macOS Sonoma 14.7.5, macOS Sequoia 15.4, iOS/iPadOS 18.4, and tvOS 18.4
• Review installed applications and remove any untrusted or unnecessary software
• Enable Gatekeeper and ensure applications are only installed from trusted sources
• Consider restricting user permissions to install applications during the patching window

Patch Information

Apple has released security updates addressing this vulnerability across all affected platforms. The patches implement improved state management for security-scoped bookmarks to prevent sandbox escape.

For detailed technical analysis of this vulnerability, refer to the Microsoft Security Blog analysis.

Workarounds

• Restrict application installations to only those from the Mac App Store, which enforces stricter sandbox policies
• Implement application allowlisting to prevent unauthorized or untrusted applications from executing
• Use Mobile Device Management (MDM) to enforce security policies and application restrictions on managed devices
• Limit user accounts to standard (non-administrator) privileges to reduce the impact of potential exploitation

# Verify current macOS version to confirm patch status
sw_vers -productVersion

# Check for available software updates
softwareupdate --list

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

# Verify Gatekeeper is enabled
spctl --status