HHC 2025 - Frosty Frostafier
SANS Holiday Hack Challenge 2025 - Frosty Frostafier Flag: hhc25{Frostify_The_World_c05730b46d0f30c9d068343e9d036f80} Challenge Overview Frosty Frostafier is a multi-stage web application security challenge that combines AI prompt injection, Server-Side Template Injection (SSTI) with filter bypass, steganography, cryptography, and privilege escalation to achieve root access and capture the flag. Attack Chain Summary ┌─────────────────────────────────────────────────────────────────────────────┐ │ 1. AI Chatbot Prompt Injection │ │ └─► Extract admin credentials from AI assistant │ ├─────────────────────────────────────────────────────────────────────────────┤ │ 2. SSTI with Octal Encoding Bypass │ │ └─► Achieve RCE as www-data user │ ├─────────────────────────────────────────────────────────────────────────────┤ │ 3. Pri...