CVE-2024-25443

Executive Summary

CVE-2024-25443 is a heap-use-after-free vulnerability discovered in Hugin v2022.0.0, specifically within the HuginBase::ImageVariable<double>::linkWith function. This flaw allows an attacker to trigger memory corruption by parsing a crafted image file, potentially leading to arbitrary code execution or denial of service. The vulnerability has a CVSS score of 0.0 (unscored) and an EPSS score of 0.0%, indicating low exploitation likelihood at this time. No public proof-of-concept (PoC) or exploit code is available, and no patch has been released by the vendor. The vulnerability is classified under CWE-416 (Use After Free), a common memory safety issue in C++ applications.

Supply Chain & Package Security

Hugin is a desktop application for panoramic photo stitching, distributed as a binary package for various operating systems. It is not an NPM, PyPI, Go, or Ruby package, so supply chain risks are limited to the distribution channels (e.g., official website, package managers). Users should verify the integrity of downloaded binaries via checksums or signatures.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (Unscored)
• CVSS Vector: UNKNOWN
• EPSS Score: 0.0% (Low exploitation probability)
• Threat Level: Medium (due to potential for code execution, but low exploitability)

The lack of a CVSS vector and score suggests the NVD has not fully analyzed this CVE. However, based on the CWE-416 classification, the vulnerability could allow an attacker to corrupt memory, potentially leading to arbitrary code execution with the privileges of the user running Hugin.

Deep Dive & Mechanics

The vulnerability resides in the HuginBase::ImageVariable<double>::linkWith function within Hugin's source code. This function is responsible for linking image variables (e.g., exposure, white balance) between different images in a panorama. A heap-use-after-free occurs when the function attempts to access memory that has already been freed, typically due to improper handling of object lifetimes or dangling pointers.

Root Cause: When parsing a crafted image file (e.g., a malformed TIFF or JPEG), Hugin may prematurely free a memory buffer that is still referenced by the linkWith function. Subsequent access to this freed memory leads to undefined behavior, which an attacker can exploit to execute arbitrary code or crash the application.

Attack Vector: The attacker must convince a user to open a specially crafted image file in Hugin. This could be achieved via social engineering (e.g., email attachment, malicious website) or by embedding the file in a legitimate-looking panorama project.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code remains in Hugin v2022.0.0. The linkWith function likely contains a use-after-free bug similar to the following pseudo-code:

// Vulnerable code (hypothetical)
void ImageVariable<double>::linkWith(ImageVariable<double>& other) {
    double* data = other.getData();
    // ... some operation that frees 'data' ...
    free(data);
    // ... later access to 'data' without checking if it's still valid ...
    double value = data[0]; // Use-after-free
}

A patched version would ensure that after freeing memory, all pointers to that memory are set to null or that the function does not access freed memory:

// Patched code (hypothetical)
void ImageVariable<double>::linkWith(ImageVariable<double>& other) {
    double* data = other.getData();
    // ... some operation that frees 'data' ...
    free(data);
    data = nullptr; // Set pointer to null after free
    // ... subsequent access checks for null ...
    if (data != nullptr) {
        double value = data[0];
    }
}

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• Hugin v2022.0.0 installed on a target system.
• A crafted image file that triggers the heap-use-after-free.

Steps:

1. Create a malicious image file (e.g., a malformed TIFF) that exploits the vulnerability. Since no public PoC exists, this requires reverse engineering the linkWith function to identify the exact memory corruption pattern.
2. Deliver the file to the target via email, download, or USB.
3. When the target opens the file in Hugin, the vulnerability triggers, potentially allowing code execution.

Lab Setup:

• Use a virtual machine with Hugin v2022.0.0 installed.
• Use a debugger (e.g., GDB) to analyze the crash and develop an exploit.
• Test the exploit in a controlled environment.

Blue Team (Defensive)

Detection:

• Monitor for unusual crashes of Hugin (e.g., application termination with memory access violations).
• Use endpoint detection and response (EDR) tools to detect heap spray or other memory corruption techniques.
• Implement application whitelisting to prevent execution of untrusted binaries.

Mitigation:

• Avoid opening untrusted image files in Hugin.
• Use sandboxing or virtualization for running Hugin.
• Monitor for updates from the Hugin project and apply patches when available.

Indicators of Compromise (IOCs)

• File Hashes: No specific hashes available; crafted images will have unique hashes.
• Process Behavior: Hugin process crashes with a segmentation fault or access violation.
• Memory Artifacts: Heap corruption patterns in the Hugin process memory.
• Network Traffic: None expected, as the vulnerability is triggered locally.

Detection Engineering

YARA Rule

rule CVE_2024_25443_Hugin_UseAfterFree {
    meta:
        description = "Detects crafted image files targeting CVE-2024-25443 in Hugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-25443"
    strings:
        $magic_tiff = { 49 49 2A 00 } // TIFF little-endian magic
        $magic_jpeg = { FF D8 FF E0 } // JPEG magic
        $exploit_pattern = { 00 00 00 00 00 00 00 00 } // Placeholder for specific exploit bytes
    condition:
        ($magic_tiff or $magic_jpeg) and $exploit_pattern
}

Sigma Rule

title: CVE-2024-25443 Hugin Heap Use-After-Free
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects Hugin crashes indicative of CVE-2024-25443 exploitation
author: Valters IT
date: 2025-04-10
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\hugin.exe'
        CommandLine|contains: '*.tif' or '*.jpg'
    condition: selection
falsepositives:
    - Legitimate use of Hugin with large images
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-25443 Hugin Malicious Image Download"; flow:to_server; content:"|49 49 2A 00|"; offset:0; depth:4; classtype:attempted-user; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Do not open untrusted image files in Hugin v2022.0.0.
2. Monitor for vendor updates at the Hugin project website (http://hugin.sourceforge.net/).
3. Use alternative software for panoramic stitching until a patch is released.

Long-term Mitigation:

• Apply memory safety practices in software development (e.g., use smart pointers, avoid manual memory management).
• Implement fuzzing for image parsing functions to catch similar vulnerabilities.
• Consider using AddressSanitizer during development to detect use-after-free bugs.

Workaround:

• If Hugin must be used, run it in a sandboxed environment (e.g., Docker, Firejail) to limit the impact of exploitation.

Valters IT