CVE-2024-53375: TP-Link Archer Router RCE Vulnerability

CVE-2024-53375 Overview

CVE-2024-53375 is an Authenticated Remote Code Execution (RCE) vulnerability affecting the TP-Link Archer router series. The vulnerability exists in the tmp_get_sites function of the HomeShield functionality provided by TP-Link. Critically, this vulnerability remains exploitable even without the activation of the HomeShield functionality, expanding the potential attack surface to a broader range of affected devices.

This command injection vulnerability (CWE-78) allows authenticated attackers on an adjacent network to execute arbitrary commands on the underlying operating system, potentially leading to complete device compromise.

Critical Impact

Authenticated attackers on adjacent networks can achieve full remote code execution on vulnerable TP-Link Archer routers, enabling complete device takeover, network traffic interception, and lateral movement capabilities.

Affected Products

• TP-Link Archer Router Series
• Devices with HomeShield functionality (exploitable regardless of activation status)
• Firmware versions prior to security patches (check vendor advisories for specific versions)

Discovery Timeline

• 2024-12-02 - CVE-2024-53375 published to NVD
• 2024-12-17 - Last updated in NVD database

Technical Details for CVE-2024-53375

Vulnerability Analysis

This vulnerability is classified as OS Command Injection (CWE-78), a critical security flaw that occurs when user-supplied input is passed to system shell commands without proper sanitization. In the context of CVE-2024-53375, the vulnerable code resides within the tmp_get_sites function, which is part of TP-Link's HomeShield feature set.

The attack requires the adversary to be on an adjacent network (such as the local LAN segment) and possess valid authentication credentials for the router's administrative interface. Once these conditions are met, the attacker can leverage the command injection flaw to execute arbitrary system commands with the privileges of the web server process, which typically runs as root on embedded devices like routers.

What makes this vulnerability particularly concerning is that it remains exploitable even when the HomeShield functionality is not actively enabled. This means that the vulnerable code path is accessible by default on affected devices, regardless of the user's feature configuration choices.

Root Cause

The root cause of CVE-2024-53375 lies in insufficient input validation and sanitization within the tmp_get_sites function. When processing user-supplied parameters, the function fails to properly escape or filter special characters and shell metacharacters before incorporating them into system commands. This allows an attacker to inject additional commands that will be executed by the underlying operating system shell.

The vulnerability represents a classic command injection pattern where trusted boundaries between user input and system command execution have been improperly implemented, allowing malicious input to break out of the intended command context.

Attack Vector

The attack vector for CVE-2024-53375 requires adjacent network access, meaning the attacker must be positioned on the same local network segment as the target router. Additionally, valid authentication credentials are required to access the vulnerable functionality.

The attack flow typically involves:

1. The attacker obtains or compromises valid router credentials
2. The attacker accesses the router's management interface from the local network
3. The attacker crafts a malicious request targeting the tmp_get_sites function
4. The injected commands are executed on the router's operating system
5. The attacker gains shell access or executes arbitrary code on the device

Technical details regarding the exploitation mechanism can be found in the ThottySploity blog post and the associated GitHub PoC repository.

Detection Methods for CVE-2024-53375

Indicators of Compromise

• Unusual outbound network connections originating from the router to external IP addresses
• Unexpected processes running on the router that are not part of standard firmware operations
• Modified router configuration files or unexpected file system changes
• Anomalous DNS queries or traffic patterns from the router
• Evidence of unauthorized access attempts in router authentication logs

Detection Strategies

• Monitor for suspicious HTTP requests to the router's web interface containing shell metacharacters or command injection patterns
• Implement network segmentation to detect and alert on unexpected traffic from router management interfaces
• Deploy behavioral analysis to identify anomalous router activity such as unexpected process execution
• Configure SIEM rules to correlate authentication events with subsequent unusual network activity from router IP addresses

Monitoring Recommendations

• Enable comprehensive logging on the router if available and forward logs to a central SIEM
• Monitor network traffic for command-and-control communication patterns originating from network infrastructure devices
• Implement regular firmware integrity checks to detect unauthorized modifications
• Configure alerts for multiple failed authentication attempts followed by successful access to router management interfaces

How to Mitigate CVE-2024-53375

Immediate Actions Required

• Update TP-Link Archer router firmware to the latest available version from the official TP-Link support website
• Change default and weak router administrative credentials immediately
• Restrict access to the router management interface to specific trusted IP addresses or MAC addresses
• Consider disabling remote management if not required for operations

Patch Information

Organizations should check the official TP-Link support website for firmware updates addressing CVE-2024-53375. Monitor TP-Link security advisories for specific affected firmware versions and recommended upgrade paths. For detailed technical analysis, refer to the ThottySploity blog post documenting this vulnerability.

Workarounds

• Implement strong network segmentation to isolate router management interfaces from untrusted network segments
• Use strong, unique passwords for router administrative accounts and enable multi-factor authentication if supported
• Disable HomeShield functionality if not required, though note that this may not fully mitigate the vulnerability
• Implement access control lists (ACLs) to restrict which devices can access the router's management interface
• Consider deploying a separate, hardened management network for infrastructure device administration

# Network segmentation example - restrict management access
# Configure firewall rules to limit router management access
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