Microsoft Kerberos Key Distribution Center (KDC) Privilege Escalation Vulnerability

CheckOps priority index

7.9/10 Patch within 7 days

Severity8.8

Probability8.7

Exploitation3/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 87.3% higher than 99.8% of CVEs

CVSS 3.1 8.8 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:

Exploited for 1,684 days 25 Mar 2022

CISA due date 15 Apr 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 3 / 5

KEV catalog (CISA)25 Mar 2022
Exploited in EUVD (ENISA)25 Mar 2022
Used by ransomwareno
EPSS above 10 %87.3%
No account, over the networkno

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply updates per vendor instructions.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

The Kerberos Key Distribution Center (KDC) in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, and Windows Server 2012 Gold and R2 allows remote authenticated domain users to obtain domain administrator privileges via a forged signature in a ticket, as exploited in the wild in November 2014, aka "Kerberos Checksum Vulnerability."

Affected products

Kerberos Key Distribution Center (KDC)

Weaknesses (CWE)

CWE-264

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

18 Nov 2014
Published
25 Mar 2022
Exploitation reported (ENISA)
25 Mar 2022
Added to the KEV catalog
15 Apr 2022
CISA remediation due date
26 Sept 2026
EPSS peak: 87.3%

References

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