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CVE-2024-50404 is a link following vulnerability in Qsync Central. The flaw allows remote attackers who have already obtained user access to traverse the file system to unintended locations by exploiting improper handling of symbolic links or similar mechanisms.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept exploit for CVE-2024-50404, a link following vulnerability in QNAP Qsync Central 4.4.x. The exploit allows a low-privileged authenticated user to upload a ZIP file containing a symlink to a sensitive file (such as /etc/shadow), extract it via the Qsync web interface, and then use the application's privilege-setting functionality to change the permissions of the target file. The attacker can then read the contents of the file through the web interface. The repository contains two files: a detailed README.md explaining the vulnerability, exploitation steps, and impact, and a Python script (file-read-poc.py) that automates the attack. The script performs login, file upload, extraction, permission change, and file read operations using HTTP requests to the QNAP Qsync Central endpoints. The exploit targets QNAP Qsync Central 4.4.x (prior to 4.4.0.16_20240819) and requires valid user credentials. The main attack vector is network-based, leveraging the web interface's file handling and privilege management endpoints. Several fingerprintable endpoints are present, including example IP addresses, file paths, and API endpoints used in the attack.
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