Vulnerability in Samba
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Samba
- Synology Directory Server
- Synology Diskstation Manager — versions 5.2, 6.1, 6.2
- Synology Router Manager — versions 1.2
- Synology Skynas
- Synology Skynas Firmware
- Synology Vs960hd
- Synology Vs960hd Firmware
- The Samba Project — versions 4.9.6, 4.10.2
- Fedoraproject Fedora — versions 29, 30
Weakness classification (CWE)
References
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.samba.org/samba/security/CVE-2019-3870.html (Patch, Mitigation, Vendor Advisory)
- bugzilla.samba.org/show_bug.cgi (Exploit, Patch, Issue Tracking, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.synology.com/security/advisory/Synology_SA_19_15 (Third Party Advisory)
- support.f5.com/csp/article/K20804356 (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-3870?
- CVE-2019-3870 is a medium-severity vulnerability in Samba, classified under Incorrect Default Permissions. CVSS score: 6.1/10. Published 2019-04-09.
- How severe is CVE-2019-3870?
- Medium severity. CVSS v3 base score is 6.1 out of 10.