Rapticore Security Research - React2Shell Scanner

A security assessment toolkit developed by the Rapticore Security Research Team for detecting React Server Components (RSC) vulnerabilities including CVE-2025-55182 (React2Shell) - a critical Remote Code Execution vulnerability.

Overview

This toolkit provides two specialized tools:

Tool	Description
ore_rsc.py	Fast RSC endpoint scanner for quick assessments
ore_react2shell.py	Full assessment suite with subdomain enumeration and reporting

Demo

Screen.Recording.2025-12-06.at.11.30.30.AM.mov

Scanner detecting CVE-2025-55182 (React2Shell) vulnerabilities in a test Next.js application.

Vulnerability Background

CVE-2025-55182 (React2Shell) is a critical RCE vulnerability affecting React Server Components:

Affected Packages	Vulnerable Versions	Fixed Versions
react-server-dom-webpack	19.0.0, 19.1.0, 19.1.1, 19.2.0	19.0.1, 19.1.2, 19.2.1+
react-server-dom-parcel	19.0.0, 19.1.0, 19.1.1, 19.2.0	19.0.1, 19.1.2, 19.2.1+
react-server-dom-turbopack	19.0.0, 19.1.0, 19.1.1, 19.2.0	19.0.1, 19.1.2, 19.2.1+

Reference: GHSA-fv66-9v8q-g76r

Features

Fast Scanner (ore_rsc.py)

• Async concurrent scanning
• RSC endpoint path discovery
• Multiple output formats (console, CSV, JSON)
• Risk classification (CRITICAL, HIGH, MEDIUM, LOW)
• Framework detection (Next.js, Remix, Waku)
• Server Action detection
• Flight protocol pattern matching
• Deep scan mode
• WAF bypass techniques

Full Assessment Suite (ore_react2shell.py)

• Subdomain enumeration (subfinder integration)
• Live host probing
• Next.js/RSC application identification
• Executive report generation (HTML, JSON, CSV, TXT)
• Risk stratification and remediation guidance
• Organized output by domain and timestamp

Installation

# Clone the repository
git clone https://github.com/rapticore/ore_react2shell_scanner.git
cd ore_react2shell_scanner

# Create virtual environment
python3 -m venv env
source env/bin/activate  # On Windows: env\Scripts\activate

# Install dependencies
pip install aiohttp jinja2

# Optional: Install subfinder for subdomain enumeration
go install github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest

Quick Start

Fast Scan with ore_rsc.py

# Single domain scan
python ore_rsc.py example.com

# Multiple domains
python ore_rsc.py example.com api.example.com

# Scan from file
python ore_rsc.py -f subdomains.txt

# Deep scan with extended paths
python ore_rsc.py example.com --deep

# Active verification (sends PoC payload)
python ore_rsc.py example.com --verify

# Safe side-channel check (non-exploitative)
python ore_rsc.py example.com --safe-check

# JSON output
python ore_rsc.py example.com --format json -o results.json

Full Assessment with ore_react2shell.py

# Full assessment with subdomain enumeration
# Results saved to: results/example_com_{timestamp}/
python ore_react2shell.py --domain example.com

# Use existing subdomain list
python ore_react2shell.py --domain example.com -f subdomains.txt

# Multiple root domains
python ore_react2shell.py --domain example.com --domain example.org

# With active verification
python ore_react2shell.py --domain example.com --verify

# Safe side-channel check
python ore_react2shell.py --domain example.com --safe-check

# Skip subdomain enumeration
python ore_react2shell.py --domain example.com --skip-enum

# Custom output directory
python ore_react2shell.py --domain example.com -o ./reports

Output Structure

Reports are automatically organized by domain and timestamp:

results/
└── example_com_20250106_143052/
    ├── rsc_assessment.html              # Interactive HTML report
    ├── rsc_assessment.json              # Machine-readable JSON
    ├── rsc_assessment.csv               # Spreadsheet format
    └── rsc_assessment_executive_summary.txt  # Text summary

Command Line Options

ore_rsc.py

Option	Description
domains	Domain(s) to scan
-f, --file	File containing domains (one per line)
-c, --concurrency	Concurrent requests (default: 20)
-t, --timeout	Request timeout in seconds (default: 25)
--deep	Deep scanning with extended paths
--verify	Active verification - sends RCE PoC payload
--safe-check	Safe side-channel verification
--waf-bypass	WAF bypass mode with junk data
-o, --output	Output file path
--format	Output format: console, json, csv

ore_react2shell.py

Option	Description
-d, --domain	Target domain(s) to assess (required)
-f, --file	File containing subdomains
--skip-enum	Skip subdomain enumeration
-c, --concurrency	Concurrent requests (default: 30)
--deep	Deep scanning with extended paths
--verify	Active verification mode
--safe-check	Safe side-channel verification
-o, --output	Base output directory (default: results)
--format	Output format: html, json, csv, txt, all

Detection Methodology

Improved Verification Logic (v1.1)

The scanner implements robust verification logic to handle unstable servers:

• Server Crash Detection: Automatically identifies HTTP 500 errors with specific RSC stack traces as confirmed vulnerabilities.
• Connection Drops: Flags immediate server disconnects during payload execution as "Likely Vulnerable" (indicating process crash).
• Safe Payload: Uses a specialized non-destructive JSON payload to trigger side-channel errors without executing system commands.

RSC Endpoint Detection

The scanners detect RSC endpoints through:

1. Content-Type Headers: text/x-component, text/x-rsc, text/x-flight
2. Response Headers: x-nextjs-cache, rsc, next-action, etc.
3. Flight Protocol Patterns: Stream chunks (0:, 1:), React references ($)
4. Server Action Markers: $ACTION_ID, formAction attributes

Risk Classification

Risk Level	Criteria
CRITICAL	Exploitation confirmed via --verify
HIGH	Likely vulnerable via --safe-check
MEDIUM	RSC endpoint with server actions
LOW	RSC endpoint detected
INFO	RSC indicators present

Remediation Guidance

If vulnerable endpoints are detected:

1. Immediate: Upgrade react-server-dom-* to fixed versions (19.0.1, 19.1.2, 19.2.1+)
2. Short-term: Deploy WAF rules, enable logging
3. Ongoing: Review Server Actions, implement CSP

Requirements

• Python 3.8+
• aiohttp
• jinja2 (for HTML reports)
• subfinder (optional, for subdomain enumeration)

Security Notice

This tool is for authorized security assessments only. Only use on domains you own or have explicit written authorization to test.

The Rapticore Security Research Team assumes no liability for misuse.

Acknowledgments

• Rapticore Security Research Team - Tool development and maintenance
• Lachlan Davidson - Original PoC and vulnerability research (CVE-2025-55182)
• Assetnote - Original CVE-2025-55182 (React2Shell) vulnerability research
• ProjectDiscovery - subfinder subdomain enumeration tool
• React Security Team for responsible disclosure coordination

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Developed by Rapticore Security Research Team