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high 7.5

CVE-2018-16860 json

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…

published 7y ago modified 4mo ago also EUVD-2018-8651

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

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.

Patch / fix

  • samba samba 4.8.12, 4.9.8, 4.10.3
  • samba Debian 14, Debian 13, Debian 12 2:4.9.5+dfsg-4
  • heimdal Debian 14, Debian 13, Debian 12 7.5.0+dfsg-3

debian advisories DEBIAN-CVE-2018-16860

  • samba Ubuntu 16.04 LTS 2:4.3.11+dfsg-0ubuntu0.16.04.20
  • samba Ubuntu 18.04 LTS 2:4.7.6+dfsg~ubuntu-0ubuntu2.10
  • heimdal Ubuntu 18.04 LTS 7.5.0+dfsg-1ubuntu0.1
  • samba Ubuntu Pro 14.04 LTS 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm1
  • heimdal Ubuntu Pro 14.04 LTS 1.6~git20131207+dfsg-1ubuntu1.2+esm1
  • heimdal Ubuntu Pro 16.04 LTS 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1

ubuntu advisories UBUNTU-CVE-2018-16860

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba openSUSE Tumbleweed 4.14.6+git.182.2205d5224e3-1.1
  • libheimdal Package Hub 15 SP1 7.7.0-bp151.4.3.1
  • libheimdal Package Hub 15 7.7.0-bp150.2.3.1
  • libheimdal openSUSE Leap 15.1, openSUSE Leap 15.0 7.7.0-lp151.3.3.1

opensuse advisories openSUSE-SU-2024:11365-1openSUSE-SU-2019:1888-1openSUSE-SU-2019:1688-1openSUSE-SU-2019:1682-1

  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 4.10.3-r0
  • samba Alpine 3.9, Alpine 3.8 4.8.12-r0
  • heimdal Alpine 3.10 7.5.0-r4
  • heimdal Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 7.5.3-r4
  • heimdal Alpine 3.7 7.4.0-r3
  • heimdal Alpine 3.8 7.5.0-r2
  • heimdal Alpine 3.9 7.5.0-r3

alpine advisories ALPINE-CVE-2018-16860

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2018-16860 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16860 updated cvss 7.5

samba: S4U2Self with unkeyed checksum

  • Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more Red Hat Enterprise Linux 8 ctdb, samba, libnetapi, ctdb-tests, samba-libs, samba-pidl, +24 more Red Hat Storage 3 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +21 more Red Hat Virtualization 4 redhat-virtualization-host-image-update
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.49% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.0 AV:N/AC:M/Au:S/C:P/I:P/A:P

Affected products

  • SAMBA samba

Classification

Weakness
  • CWE-358 Improperly Implemented Security Check for Standard

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.