CVE-2025-6805

Executive Summary

CVE-2025-6805 is a critical directory traversal vulnerability in Marvell QConvergeConsole, specifically within the deleteEventLogFile method. The flaw allows an unauthenticated, remote attacker to delete arbitrary files on the target system by supplying a maliciously crafted path. Due to the lack of proper input validation, the application processes the user-supplied path in file operations, enabling an attacker to delete files in the context of the SYSTEM account. This can lead to denial of service, data loss, or potential system instability. The vulnerability has a CVSS score of 8.2, indicating high impact on integrity and availability. No public exploit code or patch is currently available.

CVSS Breakdown & Threat Level

• CVSS Score: 8.2 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Impact confined to the vulnerable component.
• Confidentiality Impact: None (C:N) – No data exposure.
• Integrity Impact: High (I:H) – Arbitrary file deletion compromises system integrity.
• Availability Impact: High (A:H) – Deletion of critical files can cause denial of service.

Threat Level: Critical. The combination of remote, unauthenticated exploitation and SYSTEM-level impact makes this a high-priority vulnerability for any organization using Marvell QConvergeConsole.

Deep Dive & Mechanics

The vulnerability resides in the deleteEventLogFile method of the Marvell QConvergeConsole application. This method is designed to allow administrators to delete event log files. However, it fails to properly sanitize user-supplied input for path traversal sequences (e.g., ../). An attacker can send a crafted HTTP request to the vulnerable endpoint, specifying a path like ../../Windows/System32/config/SAM to delete arbitrary files outside the intended log directory.

The application runs with SYSTEM privileges, meaning any file deletion occurs with the highest level of access on the Windows system. This allows an attacker to delete critical system files, configuration files, or application binaries, leading to system instability, denial of service, or potential privilege escalation if the deletion of security-related files is leveraged.

Key Technical Details:

• Vulnerable Component: QConvergeConsole web interface.
• Vulnerable Method: deleteEventLogFile
• Root Cause: Lack of path validation (CWE-22).
• Impact: Arbitrary file deletion as SYSTEM.
• Authentication: Not required.

Vulnerable vs. Patched Code

Since no patch is available, the following illustrates the vulnerable code pattern and a hypothetical secure implementation.

Vulnerable Code (Conceptual):

def deleteEventLogFile(self, fileName):
    # No validation of fileName
    filePath = os.path.join(self.logDir, fileName)
    os.remove(filePath)

Patched Code (Conceptual):

import os

def deleteEventLogFile(self, fileName):
    # Sanitize the file name to prevent path traversal
    safeName = os.path.basename(fileName)
    filePath = os.path.join(self.logDir, safeName)
    # Ensure the resolved path is within the intended directory
    realPath = os.path.realpath(filePath)
    if not realPath.startswith(os.path.realpath(self.logDir)):
        raise ValueError("Invalid file path")
    os.remove(realPath)

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target running Marvell QConvergeConsole with the vulnerable endpoint exposed.
• Network access to the target.

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., /api/deleteEventLogFile).
2. Craft a POST request with a path traversal payload in the fileName parameter.
3. Example payload: ../../Windows/System32/drivers/etc/hosts
4. Send the request using a tool like curl:

   curl -X POST "http://target/api/deleteEventLogFile" -d "fileName=../../Windows/System32/drivers/etc/hosts"
   

5. Verify deletion by checking if the target file is no longer accessible.

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

Blue Team

Detection & Response:

• Monitor for unusual file deletion events, especially from the QConvergeConsole process.
• Look for HTTP requests containing path traversal sequences (../, ..\\) in the fileName parameter.
• Alert on deletion of critical system files (e.g., SAM, SYSTEM, boot configuration).
• Implement network segmentation to limit exposure of the QConvergeConsole interface.

Hunting Queries:

• Windows Event Log (4688): Look for process creation events where the command line includes deleteEventLogFile.
• Sysmon Event ID 11 (FileCreate): Monitor for file deletion events by the QConvergeConsole process.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /api/deleteEventLogFile with path traversal patterns.
  • Source IP addresses targeting the vulnerable endpoint.
• File System IOCs:
  • Unexpected deletion of files outside the log directory (e.g., C:\Windows\System32\*).
  • Presence of backup or shadow copies being deleted.
• Process IOCs:
  • QConvergeConsole process (e.g., QConvergeConsole.exe) performing file deletions on non-log files.

Detection Engineering

YARA Rule

rule CVE_2025_6805_Marvell_QConvergeConsole_File_Deletion {
    meta:
        description = "Detects attempts to exploit CVE-2025-6805 via path traversal in HTTP requests"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-6805"
    strings:
        $s1 = "deleteEventLogFile" ascii wide nocase
        $s2 = "..\\" ascii wide
        $s3 = "../" ascii wide
    condition:
        $s1 and any of ($s2, $s3)
}

Sigma Rule

title: CVE-2025-6805 - Marvell QConvergeConsole Directory Traversal
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests with path traversal patterns targeting the deleteEventLogFile endpoint
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/api/deleteEventLogFile'
        cs-uri-query|contains:
            - '..\\'
            - '../'
    condition: selection
falsepositives:
    - Legitimate administrative actions (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-6805 - Marvell QConvergeConsole Directory Traversal Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/api/deleteEventLogFile"; http_uri;
    content:"..\\"; http_client_body; nocase;
    sid:1000001;
    rev:1;
    reference:cve,2025-6805;
    classtype:attempted-admin;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the QConvergeConsole interface from untrusted networks (e.g., place behind a firewall or VPN).
2. Disable the deleteEventLogFile endpoint if not required, or restrict access via web server configuration.
3. Monitor logs for exploitation attempts.

Long-Term Fixes:

• Apply a vendor patch once available.
• Implement input validation and path sanitization in the application code.
• Run the application with the least privileges necessary (avoid SYSTEM account).

Workarounds:

• Use a web application firewall (WAF) to block requests containing path traversal sequences.
• Implement strict allowlisting of allowed file names for deletion.

Valters IT
DevSecOps & Cyber Threat Intelligence