Resource exhaustion in Samba
CVE-2018-16853
Samba from version 4.7.0 has a vulnerability that allows a user in a Samba AD domain to crash the KDC when Samba is built in the non-default MIT Kerberos configuration. With this advisory the Samba Team clarify that the MIT Kerberos build of the Samba AD DC is considered experimental. Therefore the Samba Team will not issue security patches for this configuration. Additionally, Samba 4.7.12, 4.8.7 and 4.9.3 have been issued as security releases to prevent building of the AD DC with MIT Kerberos unless --with-experimental-mit-ad-dc is specified to the configure command.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.031 (87.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000
Affected products
- Samba
- [Unknown] Samba — versions 4.9.3, 4.8.7, 4.7.12
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.samba.org/samba/security/CVE-2018-16853.html (Vendor Advisory)
- www.securityfocus.com/bid/106026 (VDB Entry, Third Party Advisory, vdb-entry)
- security.netapp.com/advisory/ntap-20181127-0001/ (Third Party Advisory)
- security.gentoo.org/glsa/202003-52 (vendor-advisory)
Frequently asked questions
- What is CVE-2018-16853?
- CVE-2018-16853 is a high-severity vulnerability in Samba, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2018-11-28.
- How severe is CVE-2018-16853?
- High severity. CVSS v3 base score is 7.5 out of 10.