CVE-2025-62398
📋 TL;DR
This authentication bypass vulnerability allows attackers with valid credentials to circumvent multi-factor authentication under specific conditions, potentially gaining unauthorized access to user accounts. Systems using affected authentication implementations with MFA enabled are vulnerable.
💻 Affected Systems
- Red Hat Enterprise Linux authentication components
📦 What is this software?
Moodle by Moodle
Moodle by Moodle
Moodle by Moodle
⚠️ Risk & Real-World Impact
Worst Case
Attackers with stolen credentials could bypass MFA entirely, gaining full access to user accounts including administrative privileges, leading to data theft, privilege escalation, and complete system compromise.
Likely Case
Credential stuffing attacks could succeed against MFA-protected accounts, allowing attackers to access sensitive user data and perform unauthorized actions within the compromised accounts.
If Mitigated
With proper network segmentation, strong credential policies, and monitoring, impact is limited to isolated account compromises that can be quickly detected and contained.
🎯 Exploit Status
Requires valid credentials and specific MFA configuration conditions; not trivial but achievable with knowledge of the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat Security Advisory for specific patched versions
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2025-62398
Restart Required: No
Instructions:
1. Check Red Hat Security Advisory for affected versions. 2. Apply security updates via 'yum update' or 'dnf update'. 3. Verify authentication services are functioning correctly after update.
🔧 Temporary Workarounds
Temporarily disable MFA
allDisable multi-factor authentication until patch can be applied (increases risk of credential-based attacks)
# Modify authentication configuration to disable MFA
# Specific commands depend on authentication system (PAM, SSSD, etc.)
Implement network restrictions
allRestrict authentication attempts to trusted networks only
# Use firewall rules to limit authentication service access
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="TRUSTED_NETWORK" service name="auth-service" accept'
firewall-cmd --reload
🧯 If You Can't Patch
- Implement strict rate limiting on authentication attempts
- Enable detailed authentication logging and monitor for suspicious MFA bypass patterns
🔍 How to Verify
Check if Vulnerable:
Check if system uses affected Red Hat authentication components with MFA enabled and is within affected version rangeCheck Version:
rpm -qa | grep -i 'authentication-package-name'Verify Fix Applied:
Verify authentication system version is updated beyond vulnerable versions and test MFA functionality📡 Detection & Monitoring
Log Indicators:
- Successful authentication without MFA challenge for MFA-enabled accounts
- Multiple authentication attempts from same source with varying MFA status
- Authentication logs showing MFA bypass patterns
Network Indicators:
- Unusual authentication traffic patterns
- Authentication requests bypassing expected MFA flow
SIEM Query:
auth_success AND NOT mfa_used AND account_type="mfa_enabled"