ManageEngine ADSelfService Build prior to 6003 – Remote Code Execution (Unauthenticated)
# Exploit Title: ManageEngine ADSelfService Plus 6000 – Unauthenticated Remote Code Execution # Date: 2020-08-08 # Exploit Author: Bhadresh Patel # Vendor link: https://www.manageengine.com/company.html # Version: ADSelfService Plus build < 6003 # CVE : CVE-2020-11552 This is an article with PoC exploit video of ManageEngine ADSelfService Plus – Unauthenticated Remote Code Execution Vulnerability ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Title: ==== ManageEngine ADSelfService Plus – Unauthenticated Remote Code Execution Vulnerability CVE ID: ======= CVE-2020-11552 Date: ==== 08/08/2020 (dd/mm/yyyy) Vendor: ====== As the IT management division of Zoho Corporation, ManageEngine prioritizes flexible solutions that work for all businesses, regardless of size or budget. ManageEngine crafts comprehensive IT management software with a focus on making your job easier. Our 90+ products and free tools cover everything your IT needs, at prices you can afford. From network and device management to security and service desk software, we're bringing IT together for an integrated, overarching approach to optimize your IT. Vendor link: https://www.manageengine.com/company.html Vulnerable Product: ============== ManageEngine ADSelfService Plus is an integrated self-service password management and single sign on solution. This solution helps domain users perform self-service password reset, self-service account unlock, employee self-update of personal details (e.g., mobile numbers and photos) in Microsoft Windows Active Directory. ADSelfService Plus also provides users with secure, one-click access to all SAML-supported enterprise applications, including Office 365, Salesforce, and G Suite, through Active Directory-based single sign-on (SSO). For improved security, ADSelfService Plus offers Windows two-factor authentication for all remote and local logins. Administrators find it easy to automate password resets, account unlocks while optimizing IT expenses associated with help desk calls. Product link: https://www.manageengine.com/products/self-service-password/?meadsol Abstract: ======= A remote code execution vulnerability exists in ManageEngine ADSelfService Plus Software when it does not properly enforce user privileges associated with Windows Certificate Dialog. This vulnerability could allow an unauthenticated attacker to remotely execute commands with system level privileges on target windows host. An attacker does not require any privilege on the target system in order to exploit this vulnerability. Report-Timeline: ============= 27/02/2020: Vendor notified 27/02/2020: Vendor response 28/02/2020: Marked duplicate 11/03/2020: Patch released 23/03/2020: Vendor responded regarding patch release update 26/03/2020: Patch tested and found that it partially fixed the issue. Reported back to the vendor. 18/04/2020: Shared updated report with new PoC 22/04/2020: Vendor acknowledged the issue 24/07/2020: Patch released ( https://pitstop.manageengine.com/portal/en/community/topic/adselfservice-plus-6003-release-faceid-support ) 08/08/2020: Public disclosure Affected Software Version: ============= < ADSelfService Plus build 6003 Exploitation-Technique: =================== Remote Severity Rating (CVSS): =================== 9.8 (Critical) (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) Details: ======= A remote code execution vulnerability exists in ManageEngine ADSelfService Plus Software when it does not properly enforce user privileges associated with Windows Certificate Dialog. This vulnerability could allow an unauthenticated attacker to remotely execute commands with system level privileges on target windows host. An attacker does not require any privilege on the target system in order to exploit this vulnerability. ManageEngine ADSelfService Plus thick client enables a user to perform self-service like password reset, self-service account unlock, etc by using self-service option on windows login screen. Upon selecting this option, ManageEngine ADSelfService Plus thick client software will be launched which will connect to a remote ADSelfServicePlus server to facilitate the self-service operations. A security alert can/will be triggered when “an unauthenticated attacker having physical access to the host issues a self-signed SSL certificate to the client”. Or, “a (default) self-signed SSL certificate is configured on ADSelfService Plus server”. “View Certificate” option from the security alert will allow an attacker with physical access or a remote attacker with RDP access, to export a displayed certificate to a file. This will further cascade to the standard dialog/wizard which will open file explorer as SYSTEM. By navigating file explorer through “C:\windows\system32\”, a cmd.exe can be launched as a SYSTEM. *PoC Video:* https://www.youtube.com/watch?v=slZRXffswnQ 01:00 to 05:30 : Setup the environment 05:30 to 06:34 : Exploitation Credits: ======= Bhadresh Patel ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Regards, -Bhadresh |