Critical ManageEngine ADSelfService Plus RCE flaw patched
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2020-11552 | An elevation of privilege vulnerability exists in ManageEngine ADSelfService Plus before build 6003 because it does not properly enforce user privileges associa An elevation of privilege vulnerability exists in ManageEngine ADSelfService Plus before build 6003 because it does not properly enforce user privileges associated with a Certificate dialog. This vulnerability could allow an unauthenticated attacker to escalate privileges on a Windows host. An attacker does not require any privilege on the target system in order to exploit this vulnerability. One option is the self-service option on the Windows login screen. Upon selecting this option, the thick-client software is launched, which connects to a remote ADSelfService Plus server to facilitate self-service operations. An unauthenticated attacker having physical access to the host could trigger a security alert by supplying a self-signed SSL certificate to the client. The View Certificate option from the security alert allows an attacker to export a displayed certificate to a file. This can further cascade to a dialog that can open Explorer as SYSTEM. By navigating from Explorer to \windows\system32, cmd.exe can be launched as a SYSTEM. NVD description · AI analysis pending | 9.8 | 7% | PoC ×4 |
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Full article353 words · extracted from helpnetsecurity.com · click to collapse
A critical vulnerability (CVE-2020-11552) in ManageEngine ADSelfService Plus, an Active Directory password-reset solution, could allow attackers to remotely execute commands with system level privileges on the target Windows host.
About ManageEngine ADSelfService Plus
ManageEngine ADSelfService Plus is developed by ManageEngine, a division of Zoho Corporation, a software development company that focuses on web-based business tools and information technology.
“ADSelfService Plus supports self-service password reset for WFH and remote users by enabling users to reset Windows password from their own machines and updating the cached credentials through a VPN client,” the company touts.
It also supports sending password expiration notifications to remote users through email, SMS, and push notifications; provides admins with a way to force 2-factor authentication for Windows logons; and provides users with secure access to all SAML-supported enterprise applications (e.g., Office 365, G Suite, Salesforce) through AD-based single sign-on.
About the vulnerability (CVE-2020-11552)
Unearthed and flagged by Bhadresh Patel, CVE-2020-11552 stems from the solution not properly enforcing user privileges associated with Windows Certificate Dialog.
The ManageEngineADSelfService Plus thick client software enables users to perform a password reset or an account unlock action by using self-service option on the Windows login screen. When one of these options is selected, the client software is launched and connects 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 SSLcertificate to the client’. Or, ‘a (default) self-signed SSLcertificate is configured on ADSelfService Plus server’,” he noted.
“‘ViewCertificate’ 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\’, acmd.exe can be launched as a SYSTEM.”
Patel also published a PoC exploit video (the exploitation part starts at 5:30):
ManageEngine patched CVE-2020-11552 twice, because the first patch only fixed the issue partially. Admins are advised to upgrade to ADSelfService Plus build 6003, which contains the complete security fix.
Text extracted automatically; images, tables and formatting may be missing. Original: https://www.helpnetsecurity.com/2020/08/10/cve-2020-11552/