Patchfirst
CVE-2020-1472 KEVRansomwarePublic exploit Medium · 5.5 EPSS 99.4%

Microsoft Netlogon Privilege Escalation Vulnerability

Microsoft · Netlogon

Official description · NVD

An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC). An attacker who successfully exploited the vulnerability could run a specially crafted application on a device on the network. To exploit the vulnerability, an unauthenticated attacker would be required to use MS-NRPC to connect to a domain controller to obtain domain administrator access. Microsoft is addressing the vulnerability in a phased two-part rollout. These updates address the vulnerability by modifying how Netlogon handles the usage of Netlogon secure channels. For guidelines on how to manage the changes required for this vulnerability and more information on the phased rollout, see How to manage the changes in Netlogon secure channel connections associated with CVE-2020-1472 (updated September 28, 2020). When the second phase of Windows updates become available in Q1 2021, customers will be notified via a revision to this security vulnerability. If you wish to be notified when these updates are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this advisory. See Microsoft Technical Security Notifications.

Breakdown
86.8 / 100
Exploited
Yes, in CISA KEV
Reports
8
Tactics
7/15

How an attack unfolds

Based on mappings. Select a step to see the evidence.
  1. How attackers get in

  2. What they do

  3. What can follow

First seen exploited 38 days after disclosure. Public exploit code (PoC-in-GitHub) appeared 22 days after disclosure.

  1. Disclosedday 0
  2. Public exploit codePoC-in-GitHub+22 days
  3. First seen exploitedVulnCheck KEV evidence+38 days
  4. Added to CISA KEVknown ransomware use; EU database agrees+15 mo
  5. Named in a threat reportmicrosoft.com+3 yrs

CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.

techniques

6 , grouped by in kill-chain order 6

Initial AccessTA0001

External Remote Services T1133 also Persistence
MITRE CTID mapping of the KEV entry · how it is exploited

CVE-2020-1472 is a privilege escalation vulnerability in Windows Netlogon. After gaining initial access, the actors exploit CVE-2020-1472 to compromise all Active Directory (AD) identity services. Actors have then been observed using legitimate remote access tools, such as VPN and Remote Desktop Protocol (RDP), to access the environment with the compromised credentials.

Privilege EscalationTA0004

MITRE CTID mapping of the KEV entry · primary impact

CVE-2020-1472, an elevation of privilege vulnerability in Microsoft’s Netlogon. A remote attacker can exploit this vulnerability to breach unpatched Active Directory domain controllers and obtain domain administrator access.

Credential AccessTA0006

Brute Force T1110
MITRE CTID mapping of the KEV entry · how it is exploited

CVE-2020-1472 is a privilege elevation vulnerability. The immediate effect of successful exploitation results in the ability to authentication to the vulnerable Domain Controller with Domain Administrator level credentials. In compromises exploiting this vulnerability, exploitation was typically followed immediately by dumping all hashes for Domain accounts.

DiscoveryTA0007

Domain Account T1087.002
MITRE CTID mapping of the KEV entry · primary impact

Lateral MovementTA0008

MITRE CTID mapping of the KEV entry · primary impact

ImpactTA0040

MITRE CTID mapping of the KEV entry · follow-on activity

CVE-2020-1472, an elevation of privilege vulnerability in Microsoft’s Netlogon. A remote attacker can exploit this vulnerability to breach unpatched Active Directory domain controllers and obtain domain administrator access. CVE-2020-1472 has been reported to be exploited by Ransomware groups for initial access.

Detection

2 rules for this CVE · 125 general rules for its techniques

Rules for this CVE

2 that reference CVE-2020-1472 directly.

General rules for this CVE’s techniques

These detect the technique in general, not this specific vulnerability.

External Remote ServicesT113320 general rules
Brute ForceT111025 general rules
Exploitation for Privilege EscalationT106831 general rules
Domain AccountT1087.00221 general rules
Remote ServicesT102111 general rules
Data Encrypted for ImpactT148617 general rules

Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.

What security researchers reported

Named in 8 threat reports
8 reportsMicrosoftthedfirreport.comSymantec+5Jun 2023 · 7 undated

Reports are matched by finding the exact id CVE-2020-1472 in their text; nobody has reviewed the match. One passage is shown per report, at most 320 characters, linked to the original.

thedfirreport.comUndated

Malicious ISO File Leads to Domain Wide Ransomware

ET HUNTING Suspicious lsass.exe in URI ET MALWARE Win32/IcedID Request Cookie ET POLICY SSL/TLS Certificate Observed (AnyDesk Remote Desktop Software) ET USER_AGENTS AnyDesk Remote Desktop Software User-Agent ET EXPLOIT Possible Zerologon Phase 1/3 - NetrServerReqChallenge with 0x00 Client Challenge (CVE-2020-1472)

4 passages name itOriginal (opens in a new tab) ↗

Group-IBUndated

RansomHub never sleeps episode 1

…second one, labelled with CVE-2020-1472 and known also as ZeroLogon, affects Microsoft’s Active Directory NetLogon remote Protocol (MS-NRPC), and it allows a malicious actor without user credentials to gain the highest privileges in the domain, and take the control of a vulnerable domain controller via NT Lan…

2 passages name itOriginal (opens in a new tab) ↗

Show all 8 reportsShow fewer

Also mentioned in 50 community threat pulses (AlienVault OTX)

Weaker evidence

Pulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.

References

18 links, grouped by NVD tag (17 duplicates merged)
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