CVE-2019-3870

Public Exploit

Description

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.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.26%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory samba.org Vendor Advisory samba.org
Affected: The Samba Project samba
Published at:
Updated at:

References

Link Tags
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTJVFA3RZ6G2IZDTVKLHRMX6QBYA4GPA/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6354GALK73CZWQKFUG7AWB6EIEGFMF62/ vendor advisory
https://www.samba.org/samba/security/CVE-2019-3870.html patch vendor advisory mitigation
https://bugzilla.samba.org/show_bug.cgi?id=13834 issue tracking patch vendor advisory exploit
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3870 issue tracking third party advisory
https://www.synology.com/security/advisory/Synology_SA_19_15 third party advisory
https://support.f5.com/csp/article/K20804356 third party advisory

Frequently Asked Questions

What is the severity of CVE-2019-3870?
CVE-2019-3870 has been scored as a medium severity vulnerability.
How to fix CVE-2019-3870?
To fix CVE-2019-3870, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-3870 being actively exploited in the wild?
It is possible that CVE-2019-3870 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-3870?
CVE-2019-3870 affects The Samba Project samba.
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