CVE-2024-22029: Tomcat Privilege Escalation Vulnerability

CVE-2024-22029 Overview

CVE-2024-22029 is a local privilege escalation vulnerability affecting the packaging of Apache Tomcat on SUSE Linux distributions. The vulnerability stems from insecure permissions during package installation, which creates a race condition that can be exploited by local users to escalate their privileges to root. This Time-of-Check Time-of-Use (TOCTOU) race condition occurs during the package installation process, allowing an attacker with local access and proper timing to gain complete control over the affected system.

Critical Impact

Local attackers can exploit a race condition during Tomcat package installation to escalate privileges from a low-privileged user to root, potentially compromising the entire system.

Affected Products

• Apache Tomcat packages on SUSE Linux distributions
• SUSE Linux Enterprise Server with Tomcat installed
• openSUSE distributions with Tomcat packages

Discovery Timeline

• 2024-10-16 - CVE CVE-2024-22029 published to NVD
• 2025-08-26 - Last updated in NVD database

Technical Details for CVE-2024-22029

Vulnerability Analysis

This vulnerability is classified under CWE-732 (Incorrect Permission Assignment for Critical Resource). The core issue lies in how the Tomcat package sets file and directory permissions during the installation process on SUSE-based systems. During package installation, there exists a brief window where file permissions are not properly secured, creating a race condition that local users can exploit.

The attack requires local access to the system and the ability to execute code during the narrow time window when the Tomcat package is being installed or updated. An attacker who wins this race can manipulate files or directories before proper permissions are applied, ultimately achieving root-level access.

The vulnerability requires local access and low privileges to exploit. The attacker does not need user interaction, and successful exploitation results in complete compromise of confidentiality, integrity, and availability on the affected system.

Root Cause

The root cause is improper permission handling in the Tomcat packaging scripts for SUSE distributions. During the installation sequence, critical files or directories are created with overly permissive settings before being locked down. This TOCTOU window allows attackers to interject malicious content or symbolic links that are then processed with elevated privileges by the installation scripts.

Attack Vector

The attack vector is local, requiring an attacker to have existing access to the target system. The exploitation flow typically involves:

1. An attacker monitors for Tomcat package installation or update activity on the target system
2. During the brief permission-vulnerable window, the attacker races to modify, replace, or symlink targeted files
3. If successful, the attacker's modifications are processed by the package installation scripts running with root privileges
4. The attacker gains root-level access through the manipulated installation process

The exploitation technique involves identifying the specific files or directories that are vulnerable during installation and preparing race condition exploits (such as symbolic link attacks or file content manipulation) to execute during the precise moment of vulnerability.

Detection Methods for CVE-2024-22029

Indicators of Compromise

• Unexpected symbolic links pointing to system-critical files in Tomcat installation directories
• Unusual file ownership or permission changes during or after Tomcat package operations
• Evidence of rapid file system operations targeting Tomcat directories during package installation
• Suspicious processes monitoring package manager activity

Detection Strategies

• Monitor for unusual inotify or file system watch operations targeting /var/lib/tomcat or related directories during package operations
• Implement file integrity monitoring (FIM) on Tomcat installation directories to detect unexpected modifications
• Log and alert on package installation events combined with concurrent low-privileged user activity
• Use auditd rules to track file creation and permission changes in Tomcat directories

Monitoring Recommendations

• Enable comprehensive auditing of package manager operations on systems running Tomcat
• Configure SIEM rules to correlate package installation events with suspicious local user activity
• Deploy endpoint detection solutions capable of identifying race condition exploitation attempts
• Implement real-time alerting for privilege escalation indicators on Tomcat servers

How to Mitigate CVE-2024-22029

Immediate Actions Required

• Apply updated Tomcat packages from SUSE when available that address the permission handling issue
• Restrict local user access to systems during Tomcat package installation or update operations
• Perform package installations in single-user mode when possible to eliminate race condition opportunities
• Review and audit existing Tomcat installations for signs of compromise

Patch Information

Consult the SUSE Bugzilla entry for CVE-2024-22029 for the latest patching information and updated package versions. SUSE will provide corrected packages that implement proper atomic permission handling during installation to eliminate the race condition window.

Workarounds

• Minimize the number of local user accounts on Tomcat servers to reduce the attack surface
• Perform Tomcat package installations during maintenance windows with restricted system access
• Implement mandatory access control (MAC) policies using AppArmor or SELinux to constrain file system operations during package installation
• Consider using containerized Tomcat deployments where package installation race conditions are isolated from the host system

# Restrict local access during package installation
# Run in single-user mode for package updates
sudo systemctl isolate rescue.target

# After package installation, verify permissions
sudo find /var/lib/tomcat -type f -perm /o+w -ls
sudo find /etc/tomcat -type l -ls

# Return to normal operation
sudo systemctl isolate multi-user.target