CVE-2025-64074: ZBT WE2001 Path Traversal Vulnerability

CVE-2025-64074 Overview

A path traversal vulnerability exists in the logout functionality of Shenzhen Zhibotong Electronics ZBT WE2001 firmware version 23.09.27. This vulnerability allows remote attackers to delete arbitrary files on the host system by supplying a crafted session cookie value. The flaw stems from improper validation of user-supplied input in the session cookie handling mechanism during the logout process.

Critical Impact

Remote attackers can leverage this path traversal flaw to delete critical system files, potentially causing denial of service or compromising device integrity without requiring authentication.

Affected Products

• Shenzhen Zhibotong Electronics ZBT WE2001 firmware version 23.09.27

Discovery Timeline

• 2026-02-11 - CVE-2025-64074 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2025-64074

Vulnerability Analysis

This path traversal vulnerability (CWE-22) resides in the logout functionality of the ZBT WE2001 wireless router. The device fails to properly sanitize session cookie values before using them in file system operations during the logout process. When a user logs out, the application attempts to clean up session-related files, but the lack of input validation allows an attacker to inject directory traversal sequences (such as ../) into the session cookie.

The vulnerability can be exploited remotely over the network without any authentication or user interaction. An attacker can craft a malicious HTTP request containing a specially crafted session cookie that includes path traversal sequences, causing the application to delete files outside the intended session directory.

Root Cause

The root cause of this vulnerability is improper input validation in the session cookie parsing logic within the logout handler. The application directly concatenates user-supplied cookie values with file system paths without sanitizing or validating the input for directory traversal characters. This allows attackers to escape the intended directory structure and reference arbitrary files on the system.

Attack Vector

The attack is network-based and requires no authentication or privileges. An attacker sends an HTTP request to the logout endpoint with a maliciously crafted session cookie containing path traversal sequences. The vulnerable application processes this cookie and attempts to delete the referenced file path, allowing arbitrary file deletion on the target device.

The attack flow typically involves:

1. Identifying the logout endpoint on the target ZBT WE2001 device
2. Crafting an HTTP request with a session cookie containing path traversal sequences (e.g., ../../etc/passwd)
3. The server processes the logout request and attempts to delete session files
4. Due to insufficient input validation, the path traversal sequences are interpreted, leading to deletion of arbitrary files

For detailed technical information, refer to the NeutSec Advisory for CVE-2025-64074.

Detection Methods for CVE-2025-64074

Indicators of Compromise

• HTTP requests to logout endpoints containing unusual session cookie values with path traversal sequences such as ../, ..%2f, or ..%5c
• Unexpected file deletion events on the device, particularly in system directories
• Log entries showing access to the logout functionality with abnormally long or suspicious cookie values
• Missing critical system configuration files that may have been deleted by exploitation attempts

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing path traversal patterns in cookie headers
• Monitor HTTP access logs for requests to logout endpoints with suspicious cookie values containing directory traversal sequences
• Configure file integrity monitoring (FIM) on critical system files to detect unauthorized deletions
• Deploy network intrusion detection systems (NIDS) with signatures for path traversal attack patterns targeting IoT devices

Monitoring Recommendations

• Enable verbose logging on ZBT WE2001 devices to capture all HTTP requests and cookie values
• Set up alerts for any file deletion operations outside expected session storage directories
• Regularly audit device file systems for signs of tampering or missing critical files
• Monitor network traffic for unusual patterns of requests to the logout endpoint from external sources

How to Mitigate CVE-2025-64074

Immediate Actions Required

• Restrict network access to the ZBT WE2001 device management interface to trusted networks only
• Place affected devices behind a firewall and limit exposure to untrusted networks
• Implement network segmentation to isolate IoT devices from critical infrastructure
• Monitor the ZBT WiFi vendor website for firmware updates addressing this vulnerability

Patch Information

At the time of publication, no vendor patch has been confirmed as available. Organizations should monitor the NeutSec Advisory and the ZBT WiFi website for security updates and firmware releases that address this vulnerability.

Workarounds

• Disable remote access to the device's web management interface if not required
• Implement access control lists (ACLs) to restrict access to the device from known, trusted IP addresses only
• Deploy a reverse proxy or web application firewall in front of the device to filter malicious requests containing path traversal patterns
• Consider replacing affected devices with alternatives that have received security updates if no patch becomes available

Network administrators can implement firewall rules to restrict access to the device management interface:

# Example iptables rules to restrict access to device management interface
# Allow access only from trusted management network (e.g., 192.168.1.0/24)
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