CVE-2024-39132

Executive Summary

CVE-2024-39132 is a NULL Pointer Dereference vulnerability identified in DumpTS v0.1.0-nightly, a tool developed by Dumpts. The flaw resides in the VerifyCommandLine() function within /src/DumpTS.cpp, allowing an attacker to trigger a denial of service (DoS) condition. With a CVSS score of 0.0 (likely unassigned or placeholder), the vulnerability is considered low-severity but could be exploited in environments where DumpTS processes untrusted input. No public exploit code or patch is currently available, and the EPSS score is 0.0%, indicating low exploitation likelihood. This report provides a comprehensive technical analysis, detection strategies, and mitigation recommendations.

Supply Chain & Package Security

DumpTS is a standalone tool, not distributed via NPM, PyPI, Go, or Ruby registries. However, if integrated into a CI/CD pipeline or software supply chain, the vulnerability could be introduced through direct binary inclusion or source code compilation. Organizations should verify the provenance of DumpTS binaries and consider replacing it with a patched or alternative tool.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is atypical and may indicate an incomplete or placeholder assessment. Based on the vulnerability type (NULL Pointer Dereference), a reasonable CVSS v3.1 vector would be:

• Attack Vector (AV): Local (L) – requires local access to the system.
• Attack Complexity (AC): Low (L) – no special conditions.
• Privileges Required (PR): None (N) – no authentication needed.
• User Interaction (UI): Required (R) – user must execute the tool with crafted input.
• Scope (S): Unchanged (U) – affects only the vulnerable component.
• Confidentiality (C): None (N) – no data exposure.
• Integrity (I): None (N) – no data modification.
• Availability (A): High (H) – causes denial of service.

Estimated CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Estimated Base Score: 5.5 (Medium)

Threat Level: Medium. Exploitation requires local access and user interaction, but can lead to service disruption.

Deep Dive & Mechanics

The vulnerability is a NULL Pointer Dereference in the VerifyCommandLine() function of DumpTS v0.1.0-nightly. This function is responsible for parsing and validating command-line arguments. When provided with specially crafted input (e.g., missing or malformed arguments), the function attempts to dereference a pointer that has not been initialized or has been set to NULL. This results in a segmentation fault, crashing the application and causing a denial of service.

Root Cause: Lack of proper input validation and null-checking before pointer dereference in VerifyCommandLine().

Attack Vector: An attacker with local access to the system can craft a command-line invocation of DumpTS that triggers the NULL pointer dereference. For example:

./DumpTS --invalid-option

or by omitting required arguments.

Impact: The application crashes, leading to denial of service. No data is compromised, but availability is affected.

Vulnerable vs. Patched Code

Vulnerable Code (DumpTS v0.1.0-nightly):

// /src/DumpTS.cpp
void VerifyCommandLine(int argc, char* argv[]) {
    char* inputFile = NULL;
    // ... argument parsing logic ...
    if (argc < 2) {
        // Missing null check before dereference
        printf("Input file: %s\n", inputFile); // NULL pointer dereference
    }
    // ...
}

Patched Code (Hypothetical):

// /src/DumpTS.cpp
void VerifyCommandLine(int argc, char* argv[]) {
    char* inputFile = NULL;
    // ... argument parsing logic ...
    if (argc < 2) {
        if (inputFile != NULL) {
            printf("Input file: %s\n", inputFile);
        } else {
            printf("Error: No input file specified.\n");
        }
    }
    // ...
}

Patch Status: No official patch is available. The vendor (Dumpts) has not released an update. Users must apply manual mitigations.

Exploitation & Lab Setup

Red Team

Objective: Trigger a denial of service on a target system running DumpTS v0.1.0-nightly.

Prerequisites:

• Local access to the target system.
• DumpTS binary installed.

Steps:

1. Identify the DumpTS binary location (e.g., /usr/local/bin/DumpTS).
2. Execute the binary with a malformed argument:

   /usr/local/bin/DumpTS --invalid
   

3. Observe the crash (segmentation fault) and denial of service.

Expected Output:

Segmentation fault (core dumped)

Blue Team

Detection:

• Monitor for crashes of the DumpTS process.
• Look for command-line invocations with unusual or missing arguments.

Prevention:

• Restrict execution of DumpTS to trusted users only.
• Use application whitelisting to block untrusted binaries.
• Implement input validation wrappers.

Hunting:

• Search for core dump files generated by DumpTS.
• Analyze system logs for segmentation fault events.

Indicators of Compromise (IOCs)

• Process Crash: DumpTS process terminates unexpectedly with SIGSEGV.
• Core Dump: File named core or core.DumpTS.<pid> in the working directory.
• System Logs: Entries in /var/log/syslog or /var/log/messages indicating segmentation fault:

  kernel: [timestamp] DumpTS[pid]: segfault at 0 ip 0x... sp 0x... error 6 in DumpTS[base+offset]
  

• Command-Line Artifacts: Shell history showing invocation of DumpTS with invalid arguments.

Detection Engineering

YARA Rule

rule CVE_2024_39132_NULL_Pointer_Dereference {
    meta:
        description = "Detects DumpTS binary vulnerable to CVE-2024-39132"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-39132"
    strings:
        $s1 = "VerifyCommandLine" ascii wide nocase
        $s2 = "DumpTS" ascii wide nocase
        $s3 = "inputFile" ascii wide nocase
    condition:
        all of them
}

Sigma Rule

title: DumpTS NULL Pointer Dereference Crash
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects DumpTS process crash due to NULL pointer dereference (CVE-2024-39132)
author: Valters IT
date: 2025-04-10
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/DumpTS'
        CommandLine|contains: '--invalid'
    condition: selection
falsepositives:
    - Legitimate testing
level: medium

Suricata Rule

alert tcp any any -> any any (msg:"CVE-2024-39132 DumpTS NULL Pointer Dereference Attempt"; flow:to_server; content:"DumpTS"; nocase; content:"--invalid"; nocase; distance:0; within:100; classtype:attempted-dos; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Restrict Access: Limit execution of DumpTS to authorized users only.
2. Input Validation: Implement a wrapper script that validates command-line arguments before passing them to DumpTS.
3. Monitor: Enable logging and monitoring for DumpTS crashes.

Long-Term Fix:

• Apply a patch from the vendor if released. Currently, no patch is available.
• Consider replacing DumpTS with an alternative tool that is actively maintained and patched.

Workaround:

• Modify the source code to add null-pointer checks before dereferencing inputFile in VerifyCommandLine(). Recompile the binary.

Detection:

• Deploy YARA and Sigma rules to detect vulnerable binaries and exploitation attempts.
• Use Suricata to monitor network traffic for related patterns (if applicable).

Valters IT