CVE-2025-26705

Executive Summary

CVE-2025-26705 is an Improper Privilege Management vulnerability in ZTE GoldenDB, a distributed database product. The flaw allows an authenticated attacker with low privileges to escalate their privileges within the database system. The vulnerability affects GoldenDB versions from 6.1.03 through 6.1.03.05. With a CVSS score of 5.3 (Medium), this vulnerability could lead to unauthorized data access, modification, or disruption of database operations. No public proof-of-concept or exploit code is currently available, and the patch status remains unknown.

Supply Chain & Package Security

This vulnerability is not related to any open-source package ecosystem (NPM, PyPI, Go, Ruby). It affects a proprietary enterprise database product from ZTE. Organizations using ZTE GoldenDB should treat this as a critical supply chain risk, as the vendor has not yet released a patch.

CVSS Breakdown & Threat Level

• CVSS Score: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely over the network.
• Attack Complexity: Low (AC:L) – No special conditions are required for exploitation.
• Privileges Required: Low (PR:L) – An attacker needs valid low-privilege credentials.
• User Interaction: None (UI:N) – No user action is required.
• Scope: Unchanged (S:U) – The vulnerability does not affect other components.
• Confidentiality Impact: Low (C:L) – Limited unauthorized data access.
• Integrity Impact: Low (I:L) – Limited unauthorized data modification.
• Availability Impact: Low (A:L) – Limited service disruption.

Threat Level: Medium. While the CVSS score is moderate, the potential for privilege escalation in a database system could lead to significant data breaches or operational disruption.

Deep Dive & Mechanics

The vulnerability resides in the privilege management module of ZTE GoldenDB. Improper Privilege Management (CWE-269) occurs when the software does not properly enforce restrictions on user privileges, allowing a user to gain higher privileges than intended.

In GoldenDB, the flaw likely exists in the authentication or authorization logic that handles user role assignments. An attacker with low-privilege access (e.g., a regular database user) can send specially crafted requests to the database management interface, bypassing privilege checks and gaining administrative or superuser privileges.

The attack vector is network-based, meaning the attacker can exploit this remotely without physical access. The low attack complexity suggests that no advanced techniques are required, and the attacker only needs valid low-privilege credentials.

Vulnerable vs. Patched Code

Since no patch is available, a direct code comparison cannot be provided. However, based on the vulnerability type, the following general differences are expected:

Vulnerable Code (Hypothetical):

-- Example of improper privilege check
CREATE USER 'attacker'@'%' IDENTIFIED BY 'password';
GRANT SELECT ON *.* TO 'attacker'@'%';
-- The attacker can then escalate privileges by exploiting the flaw

Patched Code (Expected):

-- Proper privilege enforcement
CREATE USER 'attacker'@'%' IDENTIFIED BY 'password';
GRANT SELECT ON specific_db.* TO 'attacker'@'%';
-- Additional checks to prevent privilege escalation

The patch would likely involve stricter validation of privilege escalation requests, proper role-based access control (RBAC) enforcement, and input sanitization.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• Access to a ZTE GoldenDB instance (version 6.1.03 to 6.1.03.05)
• Valid low-privilege credentials (e.g., a database user with SELECT privileges)

Exploitation Steps:

1. Reconnaissance: Identify the GoldenDB version and available endpoints.
2. Authentication: Log in with low-privilege credentials.
3. Privilege Escalation: Send a crafted request to the privilege management API to escalate privileges.

Example Exploit (Conceptual):

import requests

target = "https://goldendb.example.com:8080/api/privilege"
session = requests.Session()
session.auth = ('low_priv_user', 'password')

# Crafted payload to escalate privileges
payload = {
    "action": "grant",
    "user": "low_priv_user",
    "privilege": "SUPER"
}

response = session.post(target, json=payload)
if response.status_code == 200:
    print("Privilege escalation successful!")
else:
    print("Exploitation failed.")

Note: No public exploit code is available. The above is a conceptual example.

Blue Team (Defensive)

Detection:

• Monitor for unusual privilege escalation requests in database logs.
• Alert on any GRANT or REVOKE statements executed by low-privilege users.
• Use database auditing features to track privilege changes.

Mitigation:

• Restrict network access to the GoldenDB management interface.
• Implement strict RBAC policies.
• Monitor for anomalous user behavior.

Indicators of Compromise (IOCs)

• Network IOCs:
  • Unusual API requests to /api/privilege or similar endpoints.
  • Repeated failed authentication attempts followed by successful privilege escalation.
• System IOCs:
  • Unexpected GRANT or REVOKE statements in database logs.
  • Creation of new users with elevated privileges.
  • Changes to user role assignments.
• File IOCs:
  • Modified configuration files related to user privileges.
  • Presence of unauthorized scripts or tools for privilege escalation.

Detection Engineering

YARA Rule

rule CVE_2025_26705_Privilege_Escalation {
    meta:
        description = "Detects privilege escalation attempts in ZTE GoldenDB logs"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-26705"
    strings:
        $s1 = "GRANT" nocase
        $s2 = "SUPER" nocase
        $s3 = "PRIVILEGES" nocase
        $s4 = "ALTER USER" nocase
    condition:
        any of ($s1, $s2, $s3, $s4)
}

Sigma Rule

title: ZTE GoldenDB Privilege Escalation Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects privilege escalation attempts in ZTE GoldenDB logs
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-26705
logsource:
    product: zte
    service: goldendb
detection:
    selection:
        EventID: 2001
        Message|contains:
            - 'GRANT'
            - 'SUPER'
            - 'PRIVILEGES'
    condition: selection
falsepositives:
    - Legitimate administrative actions
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (
    msg:"CVE-2025-26705 ZTE GoldenDB Privilege Escalation Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/api/privilege"; http_uri;
    content:"grant"; nocase; http_client_body;
    sid:1000001;
    rev:1;
    reference:cve,2025-26705;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate Affected Systems: Restrict network access to GoldenDB instances to trusted IPs only.
2. Review User Privileges: Audit all user accounts and revoke unnecessary privileges.
3. Enable Logging: Ensure detailed logging of all privilege changes and user actions.

Long-term Fixes:

1. Apply Vendor Patch: Monitor ZTE's security advisories for a patch and apply it as soon as available.
2. Upgrade: If possible, upgrade to a patched version beyond 6.1.03.05.
3. Implement RBAC: Use role-based access control with least privilege principles.
4. Network Segmentation: Place GoldenDB behind a firewall and use VPN for administrative access.

Workarounds (if patch unavailable):

• Disable remote access to the management interface.
• Use application-level authentication with strong passwords.
• Monitor for suspicious activity using the provided detection rules.

Valters IT
Securing Digital Frontiers