Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerability

Windows Mark of the Web Security Feature Bypass Vulnerability

CheckOps priority index

4.0/10 Patch within 7 days

Severity5.4

Probability0.3

Exploitation3/5

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

EPSS · today 2.6% higher than 85.5% of CVEs

CVSS 3.1 5.4 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:

Exploited for 1,450 days 14 Nov 2022

CISA due date 09 Dec 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 3 / 5

KEV catalog (CISA)14 Nov 2022
Exploited in EUVD (ENISA)14 Nov 2022
Used by ransomwareno
EPSS above 10 %2.6%
No account, over the networkyes

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

Affected products

Windows 10 Version 20H2Windows 10 Version 22H2Windows Server 2016 (Server Core installation)Windows Server 2019Windows Server 2016Windows 10 Version 1809Windows Server 2022Windows 10 Version 1507Windows 10 Version 1607Windows Server 2019 (Server Core installation)Windows 11 version 21H2Windows 10 Version 21H2Windows 10 Version 21H1Windows 11 version 22H2Windows

Affected versions

10.0.0 <10.0.19042.2251
10.0.19045.0 <10.0.19045.2251
10.0.14393.0 <10.0.14393.5501
10.0.17763.0 <10.0.17763.3650
10.0.0 <10.0.17763.3650
10.0.20348.0 <10.0.20348.1249
10.0.10240.0 <10.0.10240.19567
10.0.0 <10.0.22000.1219
10.0.19043.0 <10.0.19044.2251
10.0.0 <10.0.19043.2251
10.0.22621.0 <10.0.22621.819

Weaknesses (CWE)

CWE-274

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

09 Nov 2022
Published
14 Nov 2022
Exploitation reported (ENISA)
14 Nov 2022
Added to the KEV catalog
09 Dec 2022
CISA remediation due date

References

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