CVE-2024-47547: Ruijie Reyee OS Auth Bypass Vulnerability

CVE-2024-47547 Overview

CVE-2024-47547 is a critical authentication vulnerability affecting Ruijie Reyee OS, a cloud-based network management platform used to manage wireless access points and network devices. The vulnerability stems from a weak mechanism implemented for users to change their passwords, which leaves the authentication system vulnerable to brute force attacks. This flaw enables attackers to systematically attempt password combinations to gain unauthorized access to affected systems.

Critical Impact

Attackers can exploit the weak password change mechanism to perform brute force attacks against Ruijie Reyee OS authentication, potentially compromising network infrastructure management capabilities and gaining unauthorized access to managed network devices.

Affected Products

• Ruijie Reyee OS versions 2.206.x up to but not including 2.320.x
• Ruijie Networks cloud-managed wireless access points running affected firmware
• Network infrastructure managed through vulnerable Reyee OS deployments

Discovery Timeline

• 2024-12-06 - CVE-2024-47547 published to NVD
• 2024-12-10 - Last updated in NVD database

Technical Details for CVE-2024-47547

Vulnerability Analysis

This vulnerability is classified under CWE-640 (Weak Password Recovery Mechanism for Forgotten Password), indicating fundamental weaknesses in how the Reyee OS handles password change operations. The flaw allows remote attackers to target the authentication system without requiring any prior authentication or user interaction.

The vulnerability affects the password change functionality within Reyee OS, where insufficient protections against repeated authentication attempts enable brute force attacks. This is particularly concerning for network management platforms like Reyee OS, as successful exploitation could grant attackers administrative control over entire network infrastructures.

Network-based exploitation with low attack complexity makes this vulnerability particularly dangerous for organizations using Reyee OS in internet-facing deployments. The potential for high impact on both confidentiality and integrity of affected systems underscores the critical nature of this flaw.

Root Cause

The root cause of CVE-2024-47547 lies in the inadequate implementation of security controls around the password change mechanism in Reyee OS. Specifically, the system fails to implement sufficient rate limiting, account lockout policies, or other protective measures that would prevent attackers from making repeated authentication attempts. This design weakness allows automated tools to systematically test password combinations until valid credentials are discovered.

Attack Vector

The attack vector for this vulnerability is network-based, allowing remote exploitation without authentication. An attacker targeting a vulnerable Reyee OS deployment would typically:

1. Identify a Reyee OS instance accessible over the network
2. Target the password change or authentication endpoint
3. Deploy automated brute force tools to systematically attempt password combinations
4. Exploit the lack of rate limiting or lockout mechanisms to continue attempts unimpeded
5. Upon discovering valid credentials, gain unauthorized access to the network management platform

The absence of proper authentication throttling mechanisms means attackers face minimal obstacles when conducting sustained brute force campaigns against affected systems.

Detection Methods for CVE-2024-47547

Indicators of Compromise

• High volume of failed authentication attempts originating from single or multiple IP addresses
• Unusual patterns in password reset or change requests
• Authentication logs showing systematic credential testing patterns
• Unexpected administrative access or configuration changes following authentication anomalies
• Network traffic analysis revealing automated attack tool signatures targeting authentication endpoints

Detection Strategies

• Implement logging and monitoring for all authentication events on Reyee OS management interfaces
• Configure alerts for excessive failed login attempts from any single source
• Deploy intrusion detection systems (IDS) with rules to detect brute force attack patterns
• Monitor for unusual administrative actions following successful authentication events
• Review authentication logs for patterns indicative of credential stuffing or dictionary attacks

Monitoring Recommendations

• Enable comprehensive audit logging for all authentication and password change events
• Establish baseline metrics for normal authentication activity to identify anomalies
• Implement real-time alerting for authentication failures exceeding defined thresholds
• Consider deploying a SIEM solution to correlate authentication events across your network infrastructure
• Regularly review access logs for Reyee OS management interfaces

How to Mitigate CVE-2024-47547

Immediate Actions Required

• Upgrade Ruijie Reyee OS to version 2.320.x or later immediately
• Restrict network access to Reyee OS management interfaces using firewall rules
• Implement additional authentication controls such as multi-factor authentication where possible
• Review and strengthen password policies for all Reyee OS user accounts
• Monitor authentication logs for signs of attempted or successful exploitation

Patch Information

Ruijie Networks has addressed this vulnerability in Reyee OS version 2.320.x. Organizations running affected versions (2.206.x up to but not including 2.320.x) should prioritize upgrading to the patched version. For detailed remediation guidance, refer to the CISA ICS Advisory ICSA-24-338-01.

Workarounds

• Isolate Reyee OS management interfaces from internet-accessible networks
• Implement network-level access controls to limit management interface access to authorized IP addresses
• Deploy a web application firewall (WAF) with brute force protection capabilities in front of management interfaces
• Enable account lockout policies at the network or application level if available
• Consider using VPN access for remote administration to reduce attack surface

# Example firewall rule to restrict management interface access
# Adjust IP ranges and interface names for your environment
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP