CVE-2025-8426

Executive Summary

CVE-2025-8426 is a critical directory traversal vulnerability in Marvell QConvergeConsole, specifically within the compressConfigFiles method. This flaw allows unauthenticated remote attackers to read arbitrary files (information disclosure) or cause a denial-of-service (DoS) condition by manipulating file paths. With a CVSS score of 9.4, the vulnerability poses a severe risk to enterprise environments using Marvell’s storage and network management console. No public proof-of-concept (PoC) or patch is currently available, making immediate mitigation through network segmentation and access controls essential.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects a proprietary enterprise software appliance (Marvell QConvergeConsole). Organizations should verify the integrity of their Marvell software distribution channels and ensure no tampered binaries are in use.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
• Base Score: 9.4 (Critical)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H)
• Integrity Impact: None (I:N)
• Availability Impact: High (A:H)

Threat Level: Critical. The combination of no authentication, low complexity, and high impact on confidentiality and availability makes this a top-priority vulnerability for any organization using Marvell QConvergeConsole.

Deep Dive & Mechanics

The vulnerability resides in the compressConfigFiles method of the Marvell QConvergeConsole web interface. This method is designed to compress configuration files for export or backup. However, it fails to properly validate user-supplied path parameters before using them in file system operations.

Root Cause: The application accepts a file path from the user (e.g., via HTTP POST or GET parameters) and passes it directly to file compression functions without sanitizing or canonicalizing the path. An attacker can inject directory traversal sequences (e.g., ../) to escape the intended configuration directory.

Attack Flow:

1. The attacker sends a crafted HTTP request to the vulnerable endpoint (e.g., /compressConfigFiles?path=../../etc/passwd).
2. The server processes the path without validation, reading the specified file.
3. The file is compressed and returned to the attacker (information disclosure) or the operation causes a crash/denial-of-service if the file is large or locked.

Impact:

• Information Disclosure: Attackers can read sensitive files such as /etc/shadow, application configuration files, or SSH keys.
• Denial-of-Service: By targeting critical system files or causing recursive compression loops, the attacker can exhaust system resources or crash the service.

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

public void compressConfigFiles(String userPath) {
    File file = new File("/var/qcc/config/" + userPath);
    // No validation of userPath
    compressAndReturn(file);
}

Patched Code (Conceptual):

public void compressConfigFiles(String userPath) {
    // Canonicalize and validate path
    File baseDir = new File("/var/qcc/config/").getCanonicalFile();
    File file = new File(baseDir, userPath).getCanonicalFile();
    if (!file.getPath().startsWith(baseDir.getPath())) {
        throw new SecurityException("Invalid path");
    }
    compressAndReturn(file);
}

The patched version uses getCanonicalFile() to resolve all .. sequences and then checks that the resulting path is within the allowed base directory.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target running Marvell QConvergeConsole (version unknown)
• Network access to the web interface (typically port 443 or 8443)

Exploitation Steps:

1. Identify the vulnerable endpoint: POST /compressConfigFiles or GET /compressConfigFiles?path=...
2. Craft a request to read /etc/passwd:

   curl -k "https://target/compressConfigFiles?path=../../etc/passwd" -o passwd.zip
   

3. Extract the zip file to view the contents:

   unzip passwd.zip
   cat passwd
   

4. For DoS, target a large file or a device file:

   curl -k "https://target/compressConfigFiles?path=../../dev/urandom" -o crash.zip
   

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

Blue Team (Defense & Detection)

Immediate Actions:

• Block external access to the QConvergeConsole web interface (use VPN or firewall rules).
• Monitor for anomalous HTTP requests containing ../ or ..%2f patterns.
• Deploy WAF rules to block directory traversal attempts.

Hunting Queries:

• Search web server logs for requests to /compressConfigFiles with suspicious path parameters.
• Look for outbound zip files containing sensitive system files.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /compressConfigFiles with path parameters containing ../ or ..%2f
  • Unusually large zip files being downloaded from the QConvergeConsole server
• File System IOCs:
  • Unexpected zip files in temporary directories (e.g., /tmp/)
  • Access logs showing reads to /etc/passwd, /etc/shadow, or other sensitive files
• System IOCs:
  • High CPU or memory usage due to compression of large files
  • Service crashes or restarts

Detection Engineering

YARA Rule

rule CVE_2025_8426_Directory_Traversal {
    meta:
        description = "Detects directory traversal attempts in Marvell QConvergeConsole logs"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2025-8426"
    strings:
        $traversal1 = "../" ascii wide nocase
        $traversal2 = "..\\" ascii wide nocase
        $traversal3 = "%2e%2e%2f" ascii wide nocase
        $traversal4 = "%2e%2e/" ascii wide nocase
        $endpoint = "compressConfigFiles" ascii wide nocase
    condition:
        $endpoint and any of ($traversal*)
}

Sigma Rule

title: CVE-2025-8426 Directory Traversal in Marvell QConvergeConsole
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests with directory traversal patterns targeting the compressConfigFiles endpoint
author: Valters IT
date: 2025-04-01
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - "compressConfigFiles"
            - "../"
            - "..\\"
            - "%2e%2e%2f"
            - "%2e%2e/"
    condition: selection
falsepositives:
    - Legitimate use of path parameters in other applications
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-8426 Marvell QConvergeConsole Directory Traversal"; flow:to_server; content:"compressConfigFiles"; http_uri; content:"../"; http_uri; nocase; sid:1000001; rev:1; reference:cve,2025-8426;)

Remediation & Mitigation

Immediate Mitigation (No Patch Available):

1. Network Segmentation: Place QConvergeConsole behind a firewall and restrict access to trusted IPs only.
2. Disable Unnecessary Features: If the compressConfigFiles functionality is not required, disable it via configuration or remove the endpoint.
3. Web Application Firewall (WAF): Deploy WAF rules to block directory traversal patterns (e.g., ../, ..%2f).
4. Monitor Logs: Enable detailed logging and alert on suspicious requests to /compressConfigFiles.

Long-Term Remediation:

• Contact Marvell support for an official patch or workaround.
• Consider migrating to an alternative management solution if Marvell does not provide a fix.
• Conduct a security audit of all exposed endpoints in the QConvergeConsole.

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