Auth bypass in Samba
CVE-2016-2125
It was found that Samba before versions 4.5.3, 4.4.8, 4.3.13 always requested forwardable tickets when using Kerberos authentication. A service to which Samba authenticated using Kerberos could subsequently use the ticket to impersonate Samba to other services or domain users.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.092 (95.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.092 · newest: 0.092 · change: 0.000
Affected products
- Samba
- [Unknown] Samba — versions 4.5.3, 4.3.13, 4.4.8
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.4, 7.6
- Red Hat Enterprise Linux Server Eus — versions 7.3, 7.4, 7.5
- Red Hat Enterprise Linux Server Tus — versions 7.3, 7.6
- Red Hat Enterprise Linux Workstation — versions 6.0, 7.0
- Red Hat Gluster Storage — versions 3.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- rhn.redhat.com/errata/RHSA-2017-0495.html (vendor-advisory, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Mitigation, Issue Tracking)
- rhn.redhat.com/errata/RHSA-2017-0494.html (vendor-advisory, Third Party Advisory)
- www.securitytracker.com/id/1037494 (VDB Entry, Third Party Advisory, vdb-entry)
- access.redhat.com/errata/RHSA-2017:1265 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/94988 (VDB Entry, Third Party Advisory, vdb-entry)
- www.samba.org/samba/security/CVE-2016-2125.html (Patch, Mitigation, Vendor Advisory)
- rhn.redhat.com/errata/RHSA-2017-0744.html (vendor-advisory, Third Party Advisory)
- rhn.redhat.com/errata/RHSA-2017-0662.html (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-2125?
- CVE-2016-2125 is a medium-severity vulnerability in Samba, classified under Improper Authentication. CVSS score: 6.5/10. Published 2018-10-31.
- How severe is CVE-2016-2125?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2016-2125 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.