CVE-2024-9554

Executive Summary

CVE-2024-9554 is a problematic authorization bypass vulnerability in the Sovell Smart Canteen System, affecting versions up to 3.0.7303.30513. The flaw resides in the Check_ET_CheckPwdz201 function within the suanfa.py file, part of the Password Reset Handler component. Successful exploitation allows an unauthenticated remote attacker to bypass password reset authorization, potentially gaining unauthorized access to user accounts. The attack complexity is high, requiring specific conditions or chaining with other weaknesses. The vendor has not responded to disclosure, leaving the product unpatched. No public proof-of-concept (PoC) or exploit code is available at this time.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
• Base Score: 4.8 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: High (AC:H) – Exploitation requires specific timing or knowledge of internal state.
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: Low (C:L) – Limited account information disclosure.
• Integrity Impact: Low (I:L) – Unauthorized password reset possible.
• Availability Impact: None (A:N)

Threat Level: Medium. While the CVSS score is moderate, the lack of a patch and the potential for account takeover elevate the risk for organizations using this system.

Deep Dive & Mechanics

The vulnerability is an authorization bypass in the password reset flow. The Check_ET_CheckPwdz201 function in suanfa.py is responsible for verifying the identity of a user requesting a password reset. The flaw likely stems from improper validation of the reset token or user identity, allowing an attacker to craft a request that bypasses the intended checks.

Technical Analysis:

• The function likely compares a provided token or user identifier against a stored value.
• The bypass may occur due to:
  • Weak token generation (e.g., predictable or static tokens).
  • Improper handling of edge cases (e.g., empty or null values).
  • Race conditions in token validation.
• The high attack complexity suggests that successful exploitation may require:
  • Knowledge of a valid username or email.
  • Timing the request during a specific system state.
  • Chaining with another vulnerability (e.g., information disclosure).

Attack Scenario:

1. Attacker identifies a target user (e.g., via enumeration or leaked data).
2. Attacker sends a crafted password reset request to the vulnerable endpoint.
3. The Check_ET_CheckPwdz201 function incorrectly authorizes the request.
4. Attacker sets a new password and gains access to the account.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical analysis based on common authorization bypass patterns.

Vulnerable Code (suanfa.py - Check_ET_CheckPwdz201):

def Check_ET_CheckPwdz201(token, user_id):
    # Weak validation: only checks if token exists in database
    if token in token_db:
        return True
    return False

Patched Code (Hypothetical):

def Check_ET_CheckPwdz201(token, user_id):
    # Strong validation: checks token, user association, and expiry
    record = token_db.get(token)
    if record and record['user_id'] == user_id and record['expires'] > time.time():
        return True
    return False

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target running Sovell Smart Canteen System <= 3.0.7303.30513.
• Network access to the password reset endpoint (e.g., /reset_password).
• Knowledge of a valid username or user ID.

Exploitation Steps:

1. Enumerate Users: Use a simple script to test for valid usernames via the login or forgot password page.
2. Craft Reset Request: Send a POST request to the password reset endpoint with a manipulated token or user ID.
3. Bypass Authorization: Exploit the weak validation in Check_ET_CheckPwdz201.
4. Set New Password: Complete the reset process and log in.

Example cURL Command (Hypothetical):

curl -X POST https://target.com/reset_password \
  -H "Content-Type: application/json" \
  -d '{"user_id": "admin", "token": "00000000-0000-0000-0000-000000000000"}'

Blue Team (Defense & Detection)

Detection:

• Monitor for unusual password reset requests, especially from unknown IPs.
• Alert on multiple failed reset attempts followed by a successful one.
• Log all Check_ET_CheckPwdz201 function calls and analyze for anomalies.

Mitigation:

• Implement strong token generation (e.g., cryptographically random, time-limited).
• Enforce user association checks for all reset tokens.
• Apply rate limiting on password reset endpoints.
• Monitor for exploitation attempts using the IOCs below.

Indicators of Compromise (IOCs)

• Network:
  • POST requests to /reset_password or similar endpoints with unusual token values (e.g., all zeros, sequential numbers).
  • Repeated requests from the same IP to different user IDs.
• Logs:
  • Check_ET_CheckPwdz201 returning True for tokens not in the database.
  • Successful password resets without a corresponding email notification.
• System:
  • Unauthorized account access or changes in user passwords.
  • Suspicious entries in the application logs related to suanfa.py.

Detection Engineering

YARA Rule

rule CVE_2024_9554_Sovell_Smart_Canteen {
    meta:
        description = "Detects exploitation attempts for CVE-2024-9554 authorization bypass"
        author = "Valters IT"
        date = "2024-10-27"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-9554"
    strings:
        $s1 = "Check_ET_CheckPwdz201" ascii wide nocase
        $s2 = "suanfa.py" ascii wide nocase
        $s3 = "reset_password" ascii wide nocase
    condition:
        any of ($s*) and filesize < 10KB
}

Sigma Rule

title: CVE-2024-9554 Authorization Bypass Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects potential exploitation of CVE-2024-9554 in Sovell Smart Canteen System
author: Valters IT
date: 2024-10-27
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/reset_password'
        cs-uri-query|contains: 'token='
    condition: selection
falsepositives:
    - Legitimate password reset requests
level: medium

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2024-9554 Sovell Smart Canteen Authorization Bypass Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/reset_password"; http_uri;
    content:"token="; http_client_body;
    pcre:"/token=[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/Ri";
    sid:1000001;
    rev:1;
    reference:cve,2024-9554;
    classtype:attempted-admin;
    priority:2;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the System: If possible, disconnect the Smart Canteen System from the internet or restrict network access.
2. Monitor Logs: Actively monitor for exploitation attempts using the provided detection rules.
3. Apply Workarounds: Implement a Web Application Firewall (WAF) rule to block suspicious password reset requests.

Long-Term Fix:

• Since the vendor is unresponsive, consider replacing the system with a supported alternative.
• If source code is available, apply the hypothetical patch described in the "Vulnerable vs. Patched Code" section.
• Engage a third-party security firm to audit and harden the application.

Valters IT Signature This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.