CVE-2025-30063: Information Disclosure Vulnerability

CVE-2025-30063 Overview

CVE-2025-30063 is a critical insecure permissions vulnerability where a configuration file containing database logins and passwords is readable by any local user on the system. This weakness (CWE-732: Incorrect Permission Assignment for Critical Resource) allows unauthorized local users to access sensitive database credentials, potentially leading to full database compromise, data theft, and lateral movement within the network.

Critical Impact

Local attackers can read plaintext database credentials from improperly secured configuration files, enabling unauthorized database access, data exfiltration, and potential privilege escalation across connected systems.

Affected Products

• Configuration files containing database credentials with improper file permissions
• Systems where sensitive configuration files are world-readable
• Applications storing database login credentials in accessible configuration files

Discovery Timeline

• 2025-08-27 - CVE CVE-2025-30063 published to NVD
• 2025-08-29 - Last updated in NVD database

Technical Details for CVE-2025-30063

Vulnerability Analysis

This vulnerability stems from a fundamental misconfiguration in file permission settings for sensitive configuration files. When configuration files containing database credentials are stored with overly permissive access rights (such as world-readable permissions like 0644 or 0755), any user with local access to the system can read these files and extract the stored credentials.

The impact of this vulnerability is severe because database credentials typically provide direct access to backend data stores. An attacker who obtains these credentials can:

• Connect directly to the database server
• Read, modify, or delete sensitive data
• Potentially escalate privileges if database accounts have elevated permissions
• Use the credentials for lateral movement if they are reused across systems

Root Cause

The root cause of CVE-2025-30063 is the failure to properly restrict file permissions on configuration files that contain sensitive information. This is classified as CWE-732 (Incorrect Permission Assignment for Critical Resource). Configuration files storing database credentials should be readable only by the application user and system administrators, typically with permissions like 0600 or 0640.

Common causes for this misconfiguration include:

• Default installation procedures that set permissive file permissions
• Improper deployment scripts or automation
• Manual configuration errors during system setup
• Lack of security hardening during application deployment

Attack Vector

The attack vector is local, requiring the attacker to have some level of authenticated access to the target system. Once authenticated (even with minimal privileges), the attacker can simply read the configuration file using standard file system commands. The low complexity of exploitation—requiring no special tools or techniques—makes this vulnerability particularly dangerous in multi-user environments or shared hosting scenarios.

A typical attack scenario involves an attacker with a low-privileged shell account navigating to the application's configuration directory and reading the configuration file contents to extract database connection strings, usernames, and passwords.

Detection Methods for CVE-2025-30063

Indicators of Compromise

• Unexpected database queries or connections from unauthorized accounts
• Access logs showing reads of configuration files by non-application users
• Database audit logs revealing authentication from unexpected IP addresses or user accounts
• File access monitoring alerts for sensitive configuration file reads

Detection Strategies

• Implement file integrity monitoring (FIM) to detect unauthorized access to configuration files
• Enable database connection logging to identify connections using leaked credentials
• Deploy user behavior analytics to detect anomalous database access patterns
• Use Security Information and Event Management (SIEM) rules to correlate configuration file access with subsequent database activity

Monitoring Recommendations

• Configure auditd or equivalent file access monitoring for all configuration files containing credentials
• Enable detailed authentication logging on database servers
• Monitor for bulk data exports or unusual query patterns that may indicate credential abuse
• Implement database activity monitoring solutions to track privileged operations

How to Mitigate CVE-2025-30063

Immediate Actions Required

• Audit file permissions on all configuration files containing sensitive credentials
• Change permissions on affected configuration files to 0600 (owner read/write only) or 0640 (owner read/write, group read)
• Rotate all database credentials that may have been exposed
• Review access logs to determine if credentials have already been compromised

Patch Information

Organizations should immediately review and correct file permissions on any configuration files containing database credentials. The CERT Security Advisory provides additional guidance on addressing this vulnerability.

Best practices for securing configuration files include:

• Setting restrictive file permissions (chmod 600 or chmod 640)
• Ensuring proper ownership by the application service account
• Considering the use of secrets management solutions instead of plaintext configuration files
• Implementing regular security audits of file permissions

Workarounds

• Move database credentials to environment variables or secrets management systems (e.g., HashiCorp Vault, AWS Secrets Manager)
• Implement database connection proxies that handle authentication without exposing credentials in configuration files
• Use encrypted configuration files with keys stored separately with proper access controls
• Apply the principle of least privilege to database accounts to limit impact if credentials are compromised

# Configuration example - Securing configuration files
# Set restrictive permissions on configuration file
chmod 600 /path/to/config/database.conf

# Ensure proper ownership (application user only)
chown appuser:appgroup /path/to/config/database.conf

# Verify permissions are correctly applied
ls -la /path/to/config/database.conf
# Expected output: -rw------- 1 appuser appgroup ... database.conf

# Audit all configuration files for insecure permissions
find /path/to/app -name "*.conf" -perm /o+r -exec ls -la {} \;