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CVE-2021-21980 is an unauthorized arbitrary file read vulnerability in the vSphere Web Client (FLEX/Flash) component of VMware vCenter Server. The vulnerability allows a remote attacker with network access to port 443 to read files from the underlying operating system without authentication, potentially exposing sensitive information.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (3 hidden).
This repository provides a realistic test environment for CVE-2021-21980, a path traversal vulnerability in VMware vCenter Server Web Client. The main components are: - `server.py`: A Python Flask application that simulates the vulnerable vSphere Web Client, specifically the /ui/vic-rest/services/containerView endpoint. It intentionally fails to sanitize the 'id' parameter, allowing directory traversal and arbitrary file read from the server's filesystem. The server mimics VMware's HTTP headers and behavior, including SSL support with a self-signed certificate. - `CVE-2021-21980.yaml`: A Nuclei template for detecting the vulnerability by sending a crafted GET request to the vulnerable endpoint and checking for the presence of sensitive file contents (e.g., /etc/passwd) in the response. - `Dockerfile` and `docker-compose.yml`: Used to build and run the vulnerable environment in a containerized setup. - `README.md`: Provides setup instructions, usage examples (manual curl and Nuclei), and details about the vulnerability. - `nuclei-validation-output.txt` and `proof-of-concept.txt`: Contain output from successful exploitation using Nuclei, demonstrating the ability to read /etc/passwd. The exploit's main capability is to allow unauthenticated arbitrary file read via a network-accessible HTTP(S) endpoint, closely simulating the real-world CVE-2021-21980 vulnerability. The repository is structured for both manual and automated testing, and is not a mock but a functional proof-of-concept environment.
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