CVE-2019-3870

Severity

36%

Complexity

39%

Confidentiality

81%

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.

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.

CVSS 3.0 Base Score 6.1. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H).

CVSS 2.0 Base Score 3.6. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:N/I:P/A:P).

Overview

First reported 5 years ago

2019-04-09 16:29:00

Last updated 5 years ago

2019-05-27 08:29:00

Affected Software

Samba Samba

Fedora 29

29

Fedora 30

30

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3870

Issue Tracking, Third Party Advisory

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

Exploit, Issue Tracking, Patch, Vendor Advisory

FEDORA-2019-db21b5f1d2

Mailing List, Third Party Advisory

FEDORA-2019-cacf88eabf

Mailing List, Third Party Advisory

https://support.f5.com/csp/article/K20804356

https://www.samba.org/samba/security/CVE-2019-3870.html

Mitigation, Patch, Vendor Advisory

https://www.synology.com/security/advisory/Synology_SA_19_15

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