CVE-2024-42219: 1Password Information Disclosure Flaw

CVE-2024-42219 Overview

CVE-2024-42219 is an authorization bypass vulnerability in 1Password 8 for macOS that allows local attackers to exfiltrate vault items due to insufficient XPC inter-process communication validation. This vulnerability affects 1Password 8 versions prior to 8.10.36 on macOS systems.

XPC (Cross-Process Communication) is Apple's native mechanism for secure inter-process communication on macOS. When XPC validation is improperly implemented, malicious local processes can impersonate legitimate clients or bypass authentication checks to access sensitive data managed by privileged services.

Critical Impact

Local attackers can exploit insufficient XPC validation to exfiltrate sensitive vault items including passwords, credentials, and other secrets stored in 1Password vaults.

Affected Products

• 1Password 8 for macOS (versions prior to 8.10.36)
• 1Password desktop application on macOS platforms
• All users with locally installed 1Password 8 on macOS

Discovery Timeline

• August 6, 2024 - CVE-2024-42219 published to NVD
• August 12, 2024 - Last updated in NVD database

Technical Details for CVE-2024-42219

Vulnerability Analysis

The vulnerability stems from insufficient validation in the XPC inter-process communication layer of 1Password 8 for macOS. XPC services are designed to provide secure sandboxed communication between processes, but when the validation of incoming connections or message authenticity is inadequate, attackers can exploit this weakness.

In this case, the 1Password application fails to properly validate XPC connections, allowing a local attacker to craft malicious IPC messages that bypass intended security controls. Since 1Password stores highly sensitive credential data in its vaults, successful exploitation enables attackers to exfiltrate passwords, secure notes, credit card information, and other secrets without proper authorization.

The local attack vector requires the attacker to have existing access to the target macOS system, which could be achieved through malware, a compromised application, or physical access to an unlocked machine.

Root Cause

The root cause is improper access control (CWE-1289) in the XPC service validation logic. The application does not adequately verify the identity and authorization of processes attempting to communicate with the 1Password XPC service. This allows unauthorized local processes to interact with the privileged 1Password components and retrieve vault contents.

Attack Vector

The attack requires local access to the macOS system where 1Password 8 is installed. An attacker can exploit this vulnerability by:

1. Running a malicious process on the target system
2. Establishing an XPC connection to the 1Password service
3. Bypassing insufficient validation checks to impersonate a legitimate client
4. Sending crafted IPC messages to request vault data
5. Receiving and exfiltrating sensitive vault items

The vulnerability is exploited through crafted XPC messages that bypass the inter-process communication validation. For technical implementation details, refer to the 1Password Security Advisory.

Detection Methods for CVE-2024-42219

Indicators of Compromise

• Unexpected processes establishing XPC connections to 1Password services
• Unusual IPC activity involving 1Password application components
• Anomalous access patterns to 1Password vault data files
• Suspicious processes running with elevated privileges attempting to interact with 1Password

Detection Strategies

• Monitor XPC service connections for unauthorized or unexpected client processes
• Implement endpoint detection rules for unusual inter-process communication with 1Password
• Track process lineage for applications attempting to access 1Password IPC endpoints
• Alert on bulk credential access or export operations from 1Password vaults

Monitoring Recommendations

• Enable detailed logging of XPC service connections on macOS endpoints
• Deploy behavioral analysis to detect credential exfiltration patterns
• Monitor for newly installed applications that interact with 1Password processes
• Implement SentinelOne's behavioral AI to detect anomalous IPC patterns indicative of exploitation

How to Mitigate CVE-2024-42219

Immediate Actions Required

• Update 1Password 8 for macOS to version 8.10.36 or later immediately
• Audit systems for any signs of compromise or unauthorized vault access
• Review installed applications for potential malicious software that could exploit this vulnerability
• Consider rotating sensitive credentials stored in 1Password vaults on potentially affected systems

Patch Information

1Password has released version 8.10.36 which addresses this vulnerability by implementing proper XPC inter-process communication validation. Users should update immediately through the 1Password application or download the latest version from the AgileBits App Updates page. For detailed information about this security update, refer to the 1Password Support Article.

Workarounds

• Restrict physical and remote access to macOS systems running vulnerable 1Password versions
• Implement application whitelisting to prevent unauthorized processes from running
• Use endpoint protection solutions to monitor and block suspicious IPC activity
• Enable macOS system integrity protection and Gatekeeper to reduce malware risk
• Consider temporarily using 1Password browser extensions or mobile apps until desktop updates are applied

# Verify 1Password version on macOS
# Open 1Password and check: 1Password > About 1Password
# Or check via command line:
defaults read /Applications/1Password.app/Contents/Info.plist CFBundleShortVersionString

# Ensure version is 8.10.36 or higher
# Update via 1Password > Check for Updates or download from official site