Taiwanese vendor QNAP issues advisory on Zerologon flaw
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2020-1472 | Unauthenticated Privilege Escalation (Zerologon) in Microsoft Netlogon Domain Controllers CVE-2020-1472, widely known as "Zerologon," is an elevation-of-privilege flaw in how the Netlogon secure channel is established over the Netlogon Remote Protocol (MS-NRPC) on Microsoft domain controllers. An unauthenticated attacker with network reachability to a domain controller sends specially crafted Netlogon messages to establish a vulnerable secure channel and then runs a specially crafted application on the network to obtain domain administrator access. Successful exploitation yields domain administrator privileges, effectively full compromise of the Active Directory environment, and the flaw is known to be used in ransomware operations. Any organization running affected Windows Server versions (2008 through 20H2) as domain controllers is exposed, along with environments using Netlogon implementations from Samba and distributions or products from Fedora, openSUSE, Canonical (Ubuntu), Debian, Synology, and Oracle. Exploitation is highly active: a public Zerologon PoC/exploit is available, the flaw is on CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03, with known ransomware use), and EPSS estimates a 99.4% probability of exploitation within 30 days. Do: Apply the vendor updates on all domain controllers and other affected systems immediately, following Microsoft's two-phase Netlogon secure channel guidance (the enforcement phase of the phased rollout began in Q1 2021). Audit Netlogon secure-channel connections and event logs for clients still using vulnerable connections before enabling full enforcement, and install updated packages for Samba and other Netlogon implementations from Fedora, openSUSE, Ubuntu, Debian, Synology, and Oracle. Given known ransomware use, prioritize patching any domain controller reachable from user networks, VPNs, or the internet. | 5.5 | 99% | KEV ransomware PoC |
| massmillions of domain controllers worldwide (essentially every Active Directory domain), with hundreds of thousands of domain controllers/RPC endpoints… |
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Taiwanese vendor QNAP published an advisory to warn customers that certain versions of its NAS OS (QTS) are affected by the Zerologon vulnerability.
The Taiwanese vendor QNAP has published an advisory to warn customers that certain versions of the operating system for its network-attached storage (NAS) devices, also known as of QTS, are affected by the Zerologon vulnerability (CVE-2020-1472).
The CVE-2020-1472 flaw is an elevation of privilege that resides in the Netlogon. The Netlogon service is an Authentication Mechanism used in the Windows Client Authentication Architecture which verifies logon requests, and it registers, authenticates, and locates Domain Controllers.
Administrators of enterprise Windows Servers have to install the August 2020 Patch Tuesday to mitigate “unacceptable risk” posed by the flaw to federal networks.
An attacker could also exploit the flaw to disable security features in the Netlogon authentication process and change a computer’s password on the domain controller’s Active Directory.
The only limitation on how to carry out a Zerologon attack is that the attacker must have access to the target network.
The flaw was discovered by researchers from the security firm Secura that also published technical details of the issue along with proof-of-concept exploits.
On September 18, the US CISA issued an Emergency Directive requiring federal agencies to install the available patches within three days.
Threat actors immediately started targeting the vulnerability in attacks in the wild, including Iranian APT groups and at least a Russian cybercrime gang.
QNAP already released security updates to address the Zerologon flaw in its products to prevent that attackers will use its NAS devices to take over entire networks.
“The Zerologon vulnerability has been reported to affect some versions of QTS.” reads the advisory issued by the vendor. “If exploited, this elevation of privilege vulnerability allows remote attackers to bypass security measures via a compromised QTS device on the network.”
Threat actors can exploit the issue in the NAS if users have configured the device as a domain controller in Control Panel > Network & File Services > Win/Mac/NFS > Microsoft Networking.
QNAP has already addressed the Zerologon vulnerability in the following software versions:
- QTS 4.5.1.1456 build 20201015 and later
- QTS 4.4.3.1439 build 20200925 and later
- QTS 4.3.6.1446 Build 20200929 and later
- QTS 4.3.4.1463 build 20201006 and later
- QTS 4.3.3.1432 build 20201006 and later
The company pointed out that QTS 2.x and QES are not affected by this flaw.
QNAP users are advised to update QTS to the latest available version and to ensure that all other applications on their devices are up to date.
QNAP’s advisory also includes details on how to install the QTS Update and to update all installed applications.
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(SecurityAffairs – hacking, QNap)
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Text extracted automatically; images, tables and formatting may be missing. Original: https://securityaffairs.com/109859/iot/qnap-zerologon-flaw.html