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Replace insecure pickle deserialization of cookies with safe JSON deserialization to prevent arbitrary code execution. #1

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Replace insecure pickle deserialization of cookies with safe JSON deserialization to prevent arbitrary code execution. #1

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5 changes: 3 additions & 2 deletions owasp-top10-2021-apps/a8/amarelo-designs/app/app.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
import uuid
import pickle
import base64
import json
app = Flask(__name__)


Expand All @@ -20,7 +21,7 @@ def login():
if username == "admin" and password == "admin":
token = str(uuid.uuid4().hex)
cookie = { "username":username, "admin":True, "sessionId":token }
pickle_resultado = pickle.dumps(cookie)
pickle_resultado = json.dumps(cookie).encode('utf-8')
encodedSessionCookie = base64.b64encode(pickle_resultado)
resp = make_response(redirect("/user"))
resp.set_cookie("sessionId", encodedSessionCookie)
Expand All @@ -37,7 +38,7 @@ def userInfo():
cookie = request.cookies.get("sessionId")
if cookie == None:
return "Não Autorizado!"
cookie = pickle.loads(base64.b64decode(cookie))
cookie = json.loads(base64.b64decode(cookie).decode('utf-8'))

return render_template('user.html')

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