CVE-2024-39130

Executive Summary

CVE-2024-39130 is a NULL Pointer Dereference vulnerability discovered in DumpTS v0.1.0-nightly, a tool developed by Dumpts. The flaw resides in the DumpOneStream() function within /src/DumpStream.cpp. An attacker can exploit this vulnerability to cause a denial of service (DoS) by triggering a NULL pointer dereference, leading to application crash. No CVSS score, EPSS score, or public exploit code is currently available. The vendor has not released a patch, and the vulnerability remains unpatched.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (Unscored)
• CVSS Vector: UNKNOWN
• Attack Vector (AV): UNKNOWN
• Attack Complexity (AC): UNKNOWN
• Privileges Required (PR): UNKNOWN
• User Interaction (UI): UNKNOWN
• Scope (S): UNKNOWN
• Confidentiality (C): UNKNOWN
• Integrity (I): UNKNOWN
• Availability (A): UNKNOWN
• Threat Level: Low (No public exploit, low EPSS score, but DoS impact)

Deep Dive & Mechanics

The vulnerability is a classic NULL pointer dereference in the DumpOneStream() function. When processing malformed or specially crafted input, the function attempts to dereference a pointer that has not been properly initialized or validated, resulting in a segmentation fault and application crash. The root cause is likely missing null checks before pointer usage in the stream dumping logic.

Technical Details:

• Vulnerable Function: DumpOneStream() in /src/DumpStream.cpp
• Trigger: Processing of a crafted input file or stream that causes a pointer to remain NULL.
• Impact: Denial of service (application crash). No code execution or data leakage is expected.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is the only reference. A hypothetical fix would involve adding null pointer checks before dereferencing.

Vulnerable Code (Hypothetical):

void DumpOneStream(Stream* s) {
    // No null check
    s->process(); // NULL pointer dereference if s is NULL
}

Patched Code (Hypothetical):

void DumpOneStream(Stream* s) {
    if (s == nullptr) {
        // Handle error gracefully
        return;
    }
    s->process();
}

Exploitation & Lab Setup

Red Team

Prerequisites:

• DumpTS v0.1.0-nightly installed on a target system.
• Ability to provide a crafted input file or stream to the application.

Exploitation Steps:

1. Identify the input mechanism for DumpTS (e.g., command-line argument, file input).
2. Craft a malformed input that triggers the NULL pointer dereference in DumpOneStream().
3. Execute DumpTS with the crafted input.
4. Observe application crash (DoS).

Example Command:

./dumpts -i crafted_input.ts

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

Blue Team

Detection:

• Monitor for crashes of the dumpts process.
• Use application logs to identify segmentation faults.
• Deploy file integrity monitoring to detect changes to input files.

Mitigation:

• Restrict execution of DumpTS to trusted users only.
• Use sandboxing or containerization to limit impact.
• Monitor for unusual input patterns.

Indicators of Compromise (IOCs)

• Process Crash: Segmentation fault in dumpts process.
• Log Entry: Application log containing "NULL pointer dereference" or "SIGSEGV".
• File Hash: SHA256 of known malicious input files (if discovered).
• Network Traffic: None expected (local DoS).

Detection Engineering

YARA Rule

rule CVE_2024_39130_NULL_Pointer_Dereference {
    meta:
        description = "Detects DumpTS v0.1.0-nightly binary with NULL pointer dereference vulnerability"
        author = "Valters IT"
        date = "2024-01-01"
        reference = "CVE-2024-39130"
    strings:
        $s1 = "DumpOneStream" ascii wide nocase
        $s2 = "DumpStream.cpp" 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 crash of DumpTS due to CVE-2024-39130
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\dumpts.exe'
        CommandLine|contains: 'segmentation fault'
    condition: selection
falsepositives:
    - Unknown
level: medium

Suricata Rule

alert tcp any any -> any any (msg:"CVE-2024-39130 DumpTS NULL Pointer Dereference Attempt"; flow:to_server; content:"|00|"; depth:1; sid:1000001; rev:1;)

Remediation & Mitigation

• Immediate: Discontinue use of DumpTS v0.1.0-nightly until a patch is released.
• Short-term: Apply input validation and sanitization if source code is available.
• Long-term: Monitor vendor for patch release. Consider using alternative tools.
• Workaround: Run DumpTS in a restricted environment with limited privileges.

Valters IT Signature This report was generated by Valters IT Cyber Threat Intelligence Division. For questions, contact threatintel@valtersit.com.