CVE-2024-48070

Executive Summary

CVE-2024-48070 is a critical remote code execution (RCE) vulnerability in Weaver E-cology, a popular enterprise collaboration platform in China. The flaw allows an unauthenticated attacker to inject and execute arbitrary malicious code on the server by sending specially crafted requests. Successful exploitation grants full control over the server, including data exfiltration, lateral movement, and potential ransomware deployment. No official patch has been released by Weaver, and no public proof-of-concept (PoC) or exploit code is currently available. The vulnerability is classified under CWE-94 (Improper Control of Generation of Code). Given the lack of patch and the high value of E-cology deployments, this poses a severe risk to organizations using the software.

Supply Chain & Package Security

Weaver E-cology is a proprietary Java-based enterprise application, not distributed via public package registries (NPM, PyPI, Go, Ruby). However, organizations should audit their internal software supply chain for any custom plugins or modules that may interact with the vulnerable component. The risk is primarily from direct exploitation of the application itself.

CVSS Breakdown & Threat Level

The CVSS score is currently listed as 0.0, likely due to incomplete or missing vector data from the NVD. Based on the description and impact, a reasonable CVSS v3.1 vector would be:

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 (AV): Network – Exploitable remotely.
• Attack Complexity (AC): Low – No special conditions required.
• Privileges Required (PR): None – No authentication needed.
• User Interaction (UI): None – No user action required.
• Scope (S): Unchanged – The vulnerable component is the only affected asset.
• Confidentiality (C): High – Full data access.
• Integrity (I): High – Full control over data and system.
• Availability (A): High – Potential for denial of service or ransomware.

Threat Level: Critical. The combination of remote, unauthenticated exploitation with full server compromise makes this a top-priority vulnerability.

Deep Dive & Mechanics

The vulnerability resides in the Weaver E-cology application, likely in a component that processes user-supplied data without proper sanitization or validation. The description indicates that attackers can "construct special requests to insert remote malicious code." This suggests an injection flaw, possibly in a parameter, header, or file upload mechanism that is later evaluated or executed by the server.

Potential Attack Vector:

1. Deserialization: Java deserialization of untrusted data could allow arbitrary code execution.
2. Expression Language (EL) Injection: If the application uses EL (e.g., in JSP or Spring), injecting malicious expressions could lead to RCE.
3. Server-Side Template Injection (SSTI): If templates are rendered with user input, SSTI could be exploited.
4. Command Injection: If user input is passed to system commands without sanitization.

The exact mechanism is unknown without a PoC, but the impact is clear: an attacker can execute arbitrary code with the privileges of the application server (often root or a high-privilege service account).

Vulnerable vs. Patched Code

Since no patch is available, a direct code comparison is not possible. However, based on the vulnerability type, the following general patterns apply:

Vulnerable Code (Hypothetical Example):

// Unsafe: Directly evaluating user input
String userInput = request.getParameter("data");
Object result = ScriptEngine.eval(userInput); // RCE

Patched Code (Hypothetical Example):

// Safe: Input validation and sanitization
String userInput = request.getParameter("data");
if (isValidInput(userInput)) {
    // Process safely
} else {
    throw new SecurityException("Invalid input");
}

Organizations should apply input validation, output encoding, and use parameterized queries or safe APIs to prevent code injection.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A vulnerable Weaver E-cology instance (version unknown).
• Network access to the target.

Exploitation Steps (Theoretical):

1. Reconnaissance: Identify the E-cology login page or API endpoints.
2. Fuzzing: Use tools like Burp Suite or custom scripts to fuzz parameters for injection points.
3. Payload Delivery: Craft a malicious request containing a payload (e.g., Java deserialization gadget chain, EL injection, or command injection).
4. Execution: Send the request and observe server behavior (e.g., reverse shell, file write, or DNS callback).

Example Payload (Command Injection):

POST /api/endpoint HTTP/1.1
Host: target.com
Content-Type: application/x-www-form-urlencoded

param=;id

Note: No public exploit code is available. This is a theoretical approach.

Blue Team (Defensive)

Detection:

• Monitor for unusual HTTP requests with special characters (e.g., ;, |, &, $, {, }).
• Look for outbound connections from the E-cology server to unknown IPs.
• Use WAF rules to block common injection patterns.

Hunting:

• Search logs for requests to endpoints that accept user input without proper validation.
• Check for unexpected file creations or modifications in the web root.
• Monitor for execution of system commands (e.g., cmd.exe, /bin/sh).

Indicators of Compromise (IOCs)

Network IOCs:

• Outbound connections to known malicious IPs or domains.
• Unusual HTTP POST requests with encoded payloads.
• DNS queries for suspicious domains (e.g., *.xyz, *.top).

File IOCs:

• Unexpected files in the application directory (e.g., .jsp, .war, .sh).
• Modified configuration files (e.g., web.xml, application.properties).
• Presence of webshells (e.g., cmd.jsp, shell.aspx).

Process IOCs:

• Unusual child processes spawned by the Java application server (e.g., cmd.exe, bash).
• High CPU or memory usage from unknown processes.

Log IOCs:

• Repeated failed login attempts followed by successful exploitation.
• Error logs containing stack traces with injection payloads.

Detection Engineering

YARA Rule

rule CVE_2024_48070_Weaver_Ecology_RCE {
    meta:
        description = "Detects potential exploitation of CVE-2024-48070 in Weaver E-cology"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-48070"
    strings:
        $s1 = "Runtime.getRuntime().exec" ascii wide nocase
        $s2 = "ProcessBuilder" ascii wide nocase
        $s3 = "java.lang.Runtime" ascii wide nocase
        $s4 = "ScriptEngine.eval" ascii wide nocase
        $s5 = "javax.script.ScriptEngineManager" ascii wide nocase
    condition:
        any of ($s*) and filesize < 10MB
}

Sigma Rule

title: CVE-2024-48070 - Weaver E-cology RCE Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests attempting to exploit CVE-2024-48070 in Weaver E-cology
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains:
            - ';'
            - '|'
            - '`'
            - '$('
            - '%00'
            - 'Runtime'
            - 'exec'
            - 'ProcessBuilder'
    condition: selection
falsepositives:
    - Legitimate use of special characters in parameters
level: high

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"CVE-2024-48070 - Weaver E-cology RCE Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/"; http_uri; pcre:"/(?:Runtime|exec|ProcessBuilder|ScriptEngine)/i"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate: If possible, isolate the E-cology server from the internet and restrict network access.
2. WAF Rules: Deploy Web Application Firewall rules to block common injection patterns (e.g., ;, |, Runtime, exec).
3. Monitor: Enable detailed logging and monitoring for suspicious activity.

Long-Term Fixes:

• Vendor Patch: Await an official patch from Weaver. Contact their support for updates.
• Upgrade: If a patched version becomes available, upgrade immediately.
• Code Review: If you have access to the source code, review and fix the injection points.
• Input Validation: Implement strict input validation and output encoding for all user-supplied data.
• Least Privilege: Run the application server with the minimum necessary privileges.

Workarounds:

• Disable unnecessary features or endpoints that accept user input.
• Use a reverse proxy to filter malicious requests.

Valters IT