CVE-2025-52627: AION Privilege Escalation Vulnerability

CVE-2025-52627 Overview

CVE-2025-52627 is an Insecure Default Configuration vulnerability affecting HCL AION version 2.0. The root file system is not mounted as read-only, which can allow unintended modifications to critical system files. This configuration weakness potentially increases the risk of system compromise or unauthorized changes to sensitive system components.

Critical Impact

Attackers with physical access and local privileges could modify critical system files, potentially compromising system integrity and enabling persistent unauthorized access.

Affected Products

• HCL AION 2.0

Discovery Timeline

• 2026-02-03 - CVE CVE-2025-52627 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2025-52627

Vulnerability Analysis

This vulnerability stems from CWE-732 (Incorrect Permission Assignment for Critical Resource). When the root file system is mounted in read-write mode instead of read-only, it creates an insecure configuration that violates the principle of least privilege. This configuration error allows processes and users to modify system files that should be immutable during normal operation.

The vulnerability requires physical access to the affected system combined with low-level privileges and user interaction to exploit. While these requirements limit the attack surface, successful exploitation could lead to high impact on both confidentiality and integrity of the affected system.

Root Cause

The root cause is an insecure default configuration in HCL AION 2.0 where the root file system (/) is not mounted with the ro (read-only) flag. This configuration choice means that any process with sufficient privileges can write to critical system directories, including configuration files, executables, and system libraries. In properly hardened systems, the root file system should be mounted read-only to prevent unauthorized or accidental modifications.

Attack Vector

The attack vector is physical access (AV:P) with high attack complexity (AC:H). An attacker would need to:

1. Gain physical access to a system running HCL AION 2.0
2. Authenticate with low-level privileges on the system
3. Leverage the read-write root file system to modify critical system files
4. Potentially establish persistence or escalate privileges through modified system components

The physical access requirement combined with the need for user interaction significantly limits the exploitability of this vulnerability. However, in environments where physical security is limited or insider threats are a concern, this configuration weakness could be leveraged as part of a larger attack chain.

Detection Methods for CVE-2025-52627

Indicators of Compromise

• Unexpected modifications to system files or binaries in the root file system
• Changes to file timestamps on critical system configuration files
• Unauthorized additions to startup scripts or cron jobs
• Modified system libraries or executables with recent timestamps

Detection Strategies

• Audit mount options using mount | grep " / " to verify root file system configuration
• Implement file integrity monitoring (FIM) on critical system directories
• Monitor system logs for unauthorized file modification attempts
• Deploy endpoint detection solutions to identify suspicious file system activity

Monitoring Recommendations

• Enable audit logging for file modifications in critical system paths such as /etc, /bin, /sbin, and /usr
• Configure alerts for changes to system boot configuration and startup scripts
• Regularly verify file system mount options against security baselines
• Implement change detection on system binaries and configuration files

How to Mitigate CVE-2025-52627

Immediate Actions Required

• Review current mount configuration using cat /proc/mounts or mount command to identify if root is mounted read-write
• Consult the HCL Software Knowledge Base Article for vendor-specific guidance
• Implement additional access controls and physical security measures until the configuration can be hardened
• Deploy file integrity monitoring on affected systems

Patch Information

HCL Software has published guidance for this vulnerability. Administrators should refer to the HCL Software Knowledge Base Article KB0127972 for official remediation steps and any available patches or updates that address this configuration issue.

Workarounds

• Configure the root file system to be mounted as read-only where operationally feasible
• Implement strict physical access controls to limit unauthorized access to affected systems
• Use file integrity monitoring solutions to detect unauthorized modifications
• Apply the principle of least privilege to all user accounts and services

# Verify current mount status of root file system
mount | grep " / "

# Check if root is mounted read-write (rw) or read-only (ro)
cat /proc/mounts | grep " / "

# Note: Remounting root as read-only should only be done after
# consulting HCL documentation and ensuring system compatibility