CVE-2024-48772

Executive Summary

CVE-2024-48772 is a security advisory affecting the C-CHIP (com.cchip.cchipamaota) application version 1.2.8. The vulnerability allows a remote attacker to obtain sensitive information through the firmware update process. This issue is classified under CWE-200 (Exposure of Sensitive Information). The vendor has not yet released a patch, and no public proof-of-concept (PoC) or exploit code is available at this time. The EPSS score is 0.0%, indicating a low probability of exploitation in the wild currently.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a standalone Android application (com.cchip.cchipamaota) that handles firmware updates for C-CHIP devices. The supply chain risk is limited to the firmware update mechanism itself, which may expose sensitive data during transmission or processing.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, but this is likely a placeholder. Based on the description, a reasonable CVSS vector would be:

• Attack Vector (AV): Network (N) – remote attacker
• Attack Complexity (AC): Low (L) – no special conditions
• Privileges Required (PR): None (N) – no authentication needed
• User Interaction (UI): None (N) – no user action required
• Scope (S): Unchanged (U) – vulnerability does not affect other components
• Confidentiality (C): High (H) – sensitive information exposed
• Integrity (I): None (N) – no data modification
• Availability (A): None (N) – no denial of service

Estimated CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Estimated Base Score: 7.5 (High)

Threat Level: High – due to remote exploitation without authentication and potential exposure of sensitive data.

Deep Dive & Mechanics

The vulnerability resides in the firmware update process of the C-CHIP application. The application likely communicates with a remote server to check for and download firmware updates. The issue allows an attacker to intercept or manipulate this process to extract sensitive information, such as device credentials, encryption keys, or user data.

Potential Attack Vector:

1. Man-in-the-Middle (MitM): An attacker on the same network could intercept the firmware update request/response.
2. Malicious Update Server: An attacker could set up a rogue update server that the application connects to, sending crafted responses that leak data.
3. Insecure Communication: The update process may use unencrypted HTTP or weak TLS configurations, allowing data exfiltration.

Root Cause: Lack of proper validation and encryption during the firmware update process, leading to information disclosure.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the vulnerable code pattern. The application likely has a function that handles firmware updates:

Vulnerable Code (Hypothetical):

// Insecure firmware update handler
public void checkForUpdate() {
    String url = "http://firmware.c-chip.com/update";
    HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
    // No encryption, no certificate validation
    InputStream in = conn.getInputStream();
    // Process update data
}

Patched Code (Hypothetical):

// Secure firmware update handler
public void checkForUpdate() {
    String url = "https://firmware.c-chip.com/update";
    HttpsURLConnection conn = (HttpsURLConnection) new URL(url).openConnection();
    conn.setSSLSocketFactory(getSecureSocketFactory());
    // Validate certificate
    conn.setHostnameVerifier(new StrictHostnameVerifier());
    InputStream in = conn.getInputStream();
    // Process update data
}

The patch would enforce HTTPS with proper certificate validation and potentially add additional authentication.

Exploitation & Lab Setup

Red Team

Objective: Extract sensitive information from the firmware update process.

Lab Setup:

• Android emulator with C-CHIP app v1.2.8 installed
• Network proxy (e.g., Burp Suite, mitmproxy) to intercept traffic
• Custom update server to simulate malicious responses

Steps:

1. Install the C-CHIP app on an emulator.
2. Configure the emulator to route traffic through a proxy.
3. Intercept the firmware update request.
4. Modify the response to include malicious payloads that leak device data.
5. Observe the app's behavior and extract any sensitive information.

Example mitmproxy script:

from mitmproxy import http

def request(flow: http.HTTPFlow) -> None:
    if "firmware.c-chip.com/update" in flow.request.pretty_url:
        # Log the request
        print(f"Request: {flow.request.text}")

def response(flow: http.HTTPFlow) -> None:
    if "firmware.c-chip.com/update" in flow.request.pretty_url:
        # Inject malicious response
        flow.response = http.HTTPResponse.make(
            200,
            b'{"status":"ok","data":"sensitive_info"}',
            {"Content-Type": "application/json"}
        )

Blue Team

Objective: Detect and prevent exploitation of the firmware update vulnerability.

Detection:

• Monitor network traffic for unencrypted firmware update requests.
• Look for connections to suspicious IPs or domains mimicking the update server.
• Use endpoint detection to identify unusual app behavior during updates.

Prevention:

• Implement network segmentation to isolate IoT devices.
• Use a web application firewall (WAF) to block malicious update requests.
• Enforce strict certificate pinning in the app.

Indicators of Compromise (IOCs)

• Domains: firmware.c-chip.com (legitimate), but watch for typosquatting domains like firmwar.c-chip.com
• IPs: Any IPs serving firmware updates that are not the official server
• File Hashes: Unknown, but monitor for modified APK files
• Network Patterns: Unencrypted HTTP requests to update endpoints
• Processes: com.cchip.cchipamaota making unexpected network connections

Detection Engineering

YARA Rule

rule CVE_2024_48772_CCHIP_Firmware_Leak {
    meta:
        description = "Detects C-CHIP firmware update traffic leaking sensitive info"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-48772"
    strings:
        $s1 = "firmware.c-chip.com" ascii wide nocase
        $s2 = "update" ascii wide nocase
        $s3 = "sensitive" ascii wide nocase
    condition:
        all of them
}

Sigma Rule

title: CVE-2024-48772 C-CHIP Firmware Information Disclosure
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects network traffic indicative of C-CHIP firmware update exploitation
author: Valters IT
date: 2025-04-10
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        DestinationHostname|contains: "firmware.c-chip.com"
        DestinationPort: 80
    condition: selection
falsepositives:
    - Legitimate firmware updates
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-48772 C-CHIP Firmware Information Disclosure"; flow:to_server; content:"firmware.c-chip.com"; http_host; content:"update"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable automatic firmware updates on affected devices until a patch is available.
2. Monitor network traffic for any suspicious update requests.
3. Isolate C-CHIP devices on a separate VLAN to limit exposure.

Long-term Fixes:

1. Vendor Patch: Apply the official patch when released (currently UNKNOWN).
2. Code Hardening: Implement HTTPS with certificate pinning in the app.
3. Input Validation: Validate all data received from update servers.
4. User Awareness: Educate users to only update firmware from trusted sources.

Workarounds:

• Use a VPN to encrypt all traffic from the device.
• Block outbound connections to unknown IPs on port 80/443.

Valters IT
DevSecOps & Cyber Threat Intelligence Expert