CVE-2025-34059: Dahua Smart Cloud Gateway SQL Injection

CVE-2025-34059 Overview

CVE-2025-34059 is an SQL injection vulnerability [CWE-89] in the Dahua Smart Cloud Gateway Registration Management Platform. The flaw exists in the username parameter of the /index.php/User/doLogin endpoint. The application fails to sanitize user-supplied input before incorporating it into SQL queries. Unauthenticated remote attackers can inject arbitrary SQL statements to extract sensitive data from the backend database. The Shadowserver Foundation observed exploitation evidence on 2025-02-05 UTC. The issue is also tracked under CNVD-2024-38747.

Critical Impact

Unauthenticated attackers can extract sensitive database contents through the login endpoint, leading to disclosure of credentials and registration data that may enable further compromise of gateway-managed devices.

Affected Products

• Zhejiang Dahua Smart Cloud Gateway Registration Management Platform
• Vulnerable endpoint: /index.php/User/doLogin
• Vulnerable parameter: username

Discovery Timeline

• 2025-07-01 - CVE-2025-34059 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-34059

Vulnerability Analysis

The Dahua Smart Cloud Gateway Registration Management Platform exposes a login handler at /index.php/User/doLogin that processes the username POST parameter. The application concatenates the supplied value into an SQL statement without parameterization or proper escaping. Attackers can break out of the intended string context and append arbitrary SQL syntax. Because the endpoint is reachable without authentication, exploitation requires no prior access to the platform.

Successful injection yields read access to database contents, including stored credentials, device registration records, and configuration data. The vulnerability is classified under CWE-89: Improper Neutralization of Special Elements used in an SQL Command.

Root Cause

The root cause is improper neutralization of special characters in user-controlled input within the login routine. The PHP-based handler builds queries through string concatenation instead of using prepared statements with bound parameters. Input validation routines do not filter SQL metacharacters from the username field before query construction.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker sends a crafted POST request to /index.php/User/doLogin containing SQL syntax in the username field. Common techniques include UNION-based extraction and time-based blind injection to enumerate database schema and exfiltrate records. Technical writeups are available in the Pentest Tools advisory, the VulnCheck advisory, and an independent CNBlogs analysis.

No verified proof-of-concept code is reproduced here. Refer to the linked advisories for payload structure and exploitation details.

Detection Methods for CVE-2025-34059

Indicators of Compromise

• POST requests to /index.php/User/doLogin containing SQL metacharacters such as single quotes, UNION SELECT, SLEEP(, BENCHMARK(, or comment sequences -- and # inside the username parameter.
• Anomalous response sizes or latency from the doLogin endpoint, indicating UNION-based or time-based blind injection.
• Authentication failure log entries showing malformed or oversized username values originating from a single source IP.
• Outbound database query errors logged by the PHP application referencing the login query.

Detection Strategies

• Deploy web application firewall signatures that flag SQL syntax in POST bodies targeting /index.php/User/doLogin.
• Inspect HTTP access logs for repeated POST submissions to the login endpoint from the same source within short time windows.
• Correlate failed login telemetry with database error events to identify injection attempts that bypass the application's error handling.

Monitoring Recommendations

• Forward web server, PHP, and database logs to a centralized analytics platform with retention sufficient to investigate the 2025-02-05 exploitation window reported by Shadowserver.
• Alert on any successful authentication immediately following requests containing SQL syntax in the username field.
• Monitor egress traffic from the gateway management host for unexpected database dumps or large outbound transfers.

How to Mitigate CVE-2025-34059

Immediate Actions Required

• Restrict network access to the Dahua Smart Cloud Gateway Registration Management Platform to trusted management networks using firewall ACLs or VPN gating.
• Block external requests to /index.php/User/doLogin at the perimeter until a vendor patch is verified and applied.
• Review database logs and account tables for unauthorized access, credential disclosure, or modified records since 2025-02-05.
• Rotate credentials for any accounts stored in the platform's database following confirmed or suspected exposure.

Patch Information

No vendor patch URL is published in the NVD entry for CVE-2025-34059. Consult the Dahua Technology website and the CNVD-2024-38747 advisory for vendor remediation guidance. Apply firmware or platform updates from Dahua as they become available.

Workarounds

• Place the management platform behind a reverse proxy or WAF that enforces strict input validation on the username parameter and blocks SQL metacharacters.
• Disable or firewall the /index.php/User/doLogin endpoint from the public internet and require operators to access the platform through a jump host.
• Apply database-level least-privilege controls so the web application account cannot read sensitive tables beyond what is required for authentication.

# Example perimeter rule (nginx) to block SQL metacharacters in the username field
location = /index.php/User/doLogin {
    if ($request_method = POST) {
        if ($request_body ~* "username=[^&]*(['\"]|--|union|select|sleep\(|benchmark\()") {
            return 403;
        }
    }
    proxy_pass http://dahua_backend;
}