CVE-2024-39225 Overview
CVE-2024-39225 is a critical remote code execution (RCE) vulnerability affecting a wide range of GL-iNet router products across multiple firmware versions. This vulnerability enables unauthenticated attackers to execute arbitrary code on affected devices by bypassing the login authentication mechanism, potentially leading to complete device compromise.
Critical Impact
Unauthenticated remote attackers can gain complete control over affected GL-iNet routers, enabling network pivoting, traffic interception, malware deployment, and persistent unauthorized access to enterprise and home networks.
Affected Products
- GL-iNet AR750/AR750S/AR300M/AR300M16/MT300N-V2/B1300/MT1300/SFT1200/X750 firmware v4.3.11
- GL-iNet MT3000/MT2500/AXT1800/AX1800/A1300/X300B firmware v4.5.16
- GL-iNet XE300 firmware v4.3.16
- GL-iNet E750 firmware v4.3.12
- GL-iNet AP1300/S1300 firmware v4.3.13
- GL-iNet XE3000/X3000 firmware v4.4
- GL-iNet MT6000 firmware v4.5.8
Discovery Timeline
- August 6, 2024 - CVE-2024-39225 published to NVD
- August 15, 2024 - Last updated in NVD database
Technical Details for CVE-2024-39225
Vulnerability Analysis
This remote code execution vulnerability stems from a flaw in the authentication mechanism of GL-iNet router firmware. The vulnerability is classified under CWE-307 (Improper Restriction of Excessive Authentication Attempts), indicating that the login mechanism fails to properly restrict or limit authentication attempts or contains a bypass condition that allows attackers to circumvent authentication entirely.
The affected GL-iNet devices are popular portable and travel routers commonly used in both consumer and enterprise environments for mobile connectivity, remote work scenarios, and IoT deployments. The network-accessible nature of this vulnerability, combined with the lack of authentication requirements, makes it particularly dangerous as attackers can exploit it remotely without any user interaction.
Root Cause
The root cause of CVE-2024-39225 lies in improper implementation of the login authentication mechanism within the GL-iNet firmware. The flaw allows attackers to bypass the intended authentication controls, gaining unauthorized access to the device's administrative functions. This authentication bypass creates a pathway to remote code execution capabilities, allowing attackers to run arbitrary commands with elevated privileges on the vulnerable router.
Attack Vector
The attack vector for this vulnerability is network-based, requiring no authentication or user interaction for successful exploitation. An attacker with network access to a vulnerable GL-iNet router can exploit the login mechanism bypass to achieve remote code execution. The attack requires low complexity to execute, and if successful, provides the attacker with complete control over the compromised device.
The exploitation flow involves an attacker identifying a vulnerable GL-iNet router on the network, exploiting the authentication bypass vulnerability to gain unauthorized access, and then leveraging the resulting access to execute arbitrary code on the device. Technical details regarding the specific bypass technique are documented in the GL-iNet CVE Issues repository.
Detection Methods for CVE-2024-39225
Indicators of Compromise
- Unexpected administrative login sessions or configuration changes on GL-iNet routers
- Unusual outbound network connections originating from router devices
- Modified firmware or system files on affected devices
- Unauthorized changes to firewall rules, DNS settings, or routing tables
Detection Strategies
- Monitor network traffic for anomalous connections to GL-iNet router management interfaces
- Implement network segmentation to isolate router management interfaces from untrusted networks
- Deploy intrusion detection systems (IDS) with signatures for GL-iNet authentication bypass attempts
- Audit router configuration files periodically for unauthorized modifications
Monitoring Recommendations
- Enable logging on all GL-iNet devices and forward logs to a centralized SIEM solution
- Monitor for failed and successful authentication attempts to router management interfaces
- Implement network behavior analysis to detect unusual traffic patterns from router IP addresses
- Set up alerts for any firmware version changes or unauthorized administrative access
How to Mitigate CVE-2024-39225
Immediate Actions Required
- Inventory all GL-iNet router devices and identify those running vulnerable firmware versions
- Restrict network access to router management interfaces using firewall rules or VLANs
- Disable remote management access from untrusted networks until patches can be applied
- Update affected devices to the latest firmware version available from GL-iNet
Patch Information
Organizations should check the GL-iNet official website and download center for the latest firmware updates addressing this vulnerability. Given the critical nature of this RCE vulnerability, immediate patching is strongly recommended for all affected device models. Administrators should verify firmware integrity after downloading and before applying updates.
Workarounds
- Isolate affected GL-iNet routers on a separate network segment with restricted access
- Implement network access control lists (ACLs) to limit management interface access to trusted IP addresses only
- Disable WAN-side management access to prevent remote exploitation
- Deploy a VPN or jump host requirement for any remote administrative access to affected devices
# Example firewall rule to restrict management access (iptables)
# Allow management access only from trusted admin subnet
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
