CVE-2019-3870

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.

• CWE-276
• CWE-276

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3870Issue Tracking, Third Party Advisory
• https://bugzilla.samba.org/show_bug.cgi?id=13834Exploit, Issue Tracking, Patch, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6354GALK73CZWQKFUG7AWB6EIEGFMF62/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTJVFA3RZ6G2IZDTVKLHRMX6QBYA4GPA/
• https://support.f5.com/csp/article/K20804356Third Party Advisory
• https://www.samba.org/samba/security/CVE-2019-3870.htmlMitigation, Patch, Vendor Advisory
• https://www.synology.com/security/advisory/Synology_SA_19_15Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3870Issue Tracking, Third Party Advisory
• https://bugzilla.samba.org/show_bug.cgi?id=13834Exploit, Issue Tracking, Patch, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6354GALK73CZWQKFUG7AWB6EIEGFMF62/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTJVFA3RZ6G2IZDTVKLHRMX6QBYA4GPA/
• https://support.f5.com/csp/article/K20804356Third Party Advisory
• https://www.samba.org/samba/security/CVE-2019-3870.htmlMitigation, Patch, Vendor Advisory
• https://www.synology.com/security/advisory/Synology_SA_19_15Third Party Advisory

Published

Apr 9, 2019

Last Modified

Jun 17, 2026

Status

Modified

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