samba: S4U2Self with unkeyed checksum
Published Jul 31, 2019
7.5
HIGHCVSS 3.0
EPSS 2.49%
Description
A flaw was found in samba's Heimdal KDC implementation, versions 4.8.x up to, excluding 4.8.12, 4.9.x up to, excluding 4.9.8 and 4.10.x up to, excluding 4.10.3, when used in AD DC mode. A man in the middle attacker could use this flaw to intercept the request to the KDC and replace the user name (principal) in the request with any desired user name (principal) that exists in the KDC effectively obtaining a ticket for that principal.
Affected products
-
- Version 4.10.x up to, excluding 4.10.3StatusaffectedConstraints-
- Version 4.8.x up to, excluding 4.8.12StatusaffectedConstraints-
- Version 4.9.x up to, excluding 4.9.8StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
No data.
Red Hat Enterprise Linux 6
samba
Not affected
Red Hat Enterprise Linux 6
samba4
Not affected
Red Hat Enterprise Linux 7
samba
Not affected
Red Hat Enterprise Linux 8
samba
Not affected
Red Hat Storage 3
samba
Not affected
Red Hat Virtualization 4
redhat-virtualization-host
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 6 | samba4 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 8 | samba | Not affected | n/a |
| Red Hat Storage 3 | samba | Not affected | n/a |
| Red Hat Virtualization 4 | redhat-virtualization-host | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:M/Au:S/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.49% (0.02486) | 84.05th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.49% (0.02486) | 82.49th | v5 (v2026.06.15) |
| May 31, 2026 | 1.17% (0.01169) | 78.96th | v4 (v2025.03.14) |
| Nov 21, 2025 | 2.65% (0.02648) | 85.25th | v4 (v2025.03.14) |
| Nov 18, 2025 | 0.91% (0.00910) | 73.83th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.99% (0.01992) | 82.01th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.58% (0.04579) | 81.66th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.99% (0.01992) | 82.43th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.32% (0.00321) | 71.46th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.29% (0.00285) | 67.84th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.29% (0.00285) | 63.75th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.55% (0.01547) | 74.98th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.55% (0.01547) | 74.94th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.55% (0.01547) | 72.92th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.55% (0.01547) | 51.82th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.68% (0.03679) | 72.20th | v1 |
| Jan 6, 2022 | 3.68% (0.03679) | 71.95th | v1 |
| Sep 1, 2021 | 3.68% (0.03679) | 82.80th | v1 |
| Apr 14, 2021 | 3.68% (0.03679) | 0.00th | v1 |
References (21)
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00026.html vendor-advisoryx_refsource_SUSE
- http://seclists.org/fulldisclosure/2019/Aug/11 mailing-listx_refsource_FULLDISC
- http://seclists.org/fulldisclosure/2019/Aug/13 mailing-listx_refsource_FULLDISC
- http://seclists.org/fulldisclosure/2019/Aug/14 mailing-listx_refsource_FULLDISC
- http://seclists.org/fulldisclosure/2019/Aug/15 mailing-listx_refsource_FULLDISC
- https://access.redhat.com/security/cve/CVE-2018-16860 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1705877 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16860 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-16860
- https://seclists.org/bugtraq/2019/Aug/21 mailing-listx_refsource_BUGTRAQ
- https://seclists.org/bugtraq/2019/Aug/22 mailing-listx_refsource_BUGTRAQ
- https://seclists.org/bugtraq/2019/Aug/23 mailing-listx_refsource_BUGTRAQ
- https://seclists.org/bugtraq/2019/Aug/25 mailing-listx_refsource_BUGTRAQ
- https://security.gentoo.org/glsa/202003-52 vendor-advisoryx_refsource_GENTOO
- https://support.apple.com/HT210346 x_refsource_CONFIRM
- https://support.apple.com/HT210348 x_refsource_CONFIRM
- https://support.apple.com/HT210351 x_refsource_CONFIRM
- https://support.apple.com/HT210353 x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2018-16860
- https://www.samba.org/samba/security/CVE-2018-16860.html x_refsource_MISCMitigationVendor Advisory
- https://www.synology.com/security/advisory/Synology_SA_19_23 x_refsource_CONFIRM
Change history (0)
No recorded changes yet.