Is CVE-2019-3870 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 1%.

What products does CVE-2019-3870 affect?

Tracked products affected include Samba. Check the version you run to see whether it is affected.

How do I fix CVE-2019-3870?

Apply the vendor fix in your normal patch cycle. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2019-3870

Q: What is CVE-2019-3870?

CVE-2019-3870 is a medium-severity software vulnerability (CWE-276) with a CVSS score of 6.1. A vulnerability was found in Samba from version (including) 4.9 to versions before 4.9.6 and 4.10.2. During the creation of a new Samba AD DC, files are created in a private subdirectory of the install location. This directory is typically

MEDIUM severity · CVSS 6.1 · CWE-276

6.1CVSS MEDIUM

Summary

A vulnerability was found in Samba from version (including) 4.9 to versions before 4.9.6 and 4.10.2. During the creation of a new Samba AD DC, files are created in a private subdirectory of the install location. This directory is typically mode 0700, that is owner (root) only access. However in some upgraded installations it will have other permissions, such as 0755, because this was the default before Samba 4.8. Within this directory, files are created with mode 0666, which is world-writable, including a sample krb5.conf, and the list of DNS names and servicePrincipalName values to update.

Impact & exploitability

Attack vectorLocal

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactNone

Integrity impactLow

Availability impactHigh

Exploit probability (EPSS)1%

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

Affected products we track (1)

Samba

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://bugzilla.samba.org/show_bug.cgi?id=13834 ↗

CVE-2019-3870

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information