Skip to content
Fencer Vulns
medium 5.4

CVE-2018-1139 json

A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disa…

published 2018-08-22 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11777

cvss
5.4
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disabled. A man-in-the-middle attacker could use this flaw to read the credential and other details passed between the samba server and client.

Patch / fix

  • samba samba 4.7.9, 4.8.4
  • samba Debian 14, Debian 13, Debian 12 2:4.8.4+dfsg-1

debian advisories DEBIAN-CVE-2018-1139

  • samba Ubuntu 18.04 LTS 2:4.7.6+dfsg~ubuntu-0ubuntu2.2

ubuntu advisories UBUNTU-CVE-2018-1139

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 RHEL 7 4.8.3-4.el7
  • ctdb RHEL 7 4.8.3-4.el7
  • samba-dc RHEL 7 4.8.3-4.el7
  • ctdb-tests RHEL 7 4.8.3-4.el7
  • samba-libs RHEL 7 4.8.3-4.el7
  • samba-pidl RHEL 7 4.8.3-4.el7
  • samba-test RHEL 7 4.8.3-4.el7
  • libwbclient RHEL 7 4.8.3-4.el7

red hat advisories RHSA-2018:3056RHSA-2018:2612RHSA-2018:2613

  • samba SLE Module for Basesystem 15, SLE High Availability Extension 15 4.7.8+git.86.94b6d10f7dd-4.15.1

suse advisories SUSE-SU-2018:2318-1

  • samba openSUSE Tumbleweed 4.14.6+git.182.2205d5224e3-1.1

opensuse advisories openSUSE-SU-2024:11365-1

  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 4.8.4-r0
  • samba Alpine 3.7 4.7.6-r1

alpine advisories ALPINE-CVE-2018-1139

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

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-2018-1139 updated cvss 5.4

samba: Weak authentication protocol regression

  • Red Hat Enterprise Linux Client (v. 7) samba 4.8.3-4.el7, samba-libs 4.8.3-4.el7, libwbclient 4.8.3-4.el7, libsmbclient 4.8.3-4.el7, samba-client 4.8.3-4.el7, samba-common 4.8.3-4.el7, +7 more Red Hat Enterprise Linux Client Optional (v. 7) samba 4.8.3-4.el7, samba-dc 4.8.3-4.el7, samba-pidl 4.8.3-4.el7, samba-test 4.8.3-4.el7, samba-python 4.8.3-4.el7, samba-dc-libs 4.8.3-4.el7, +4 more Red Hat Enterprise Linux ComputeNode (v. 7) samba 4.8.3-4.el7, samba-libs 4.8.3-4.el7, libwbclient 4.8.3-4.el7, libsmbclient 4.8.3-4.el7, samba-client 4.8.3-4.el7, samba-common 4.8.3-4.el7, +6 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) samba 4.8.3-4.el7, samba-dc 4.8.3-4.el7, samba-pidl 4.8.3-4.el7, samba-test 4.8.3-4.el7, samba-python 4.8.3-4.el7, samba-dc-libs 4.8.3-4.el7, +5 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) samba 4.8.3-4.el7, samba-libs 4.8.3-4.el7, libwbclient 4.8.3-4.el7, libsmbclient 4.8.3-4.el7, samba-client 4.8.3-4.el7, samba-common 4.8.3-4.el7, +8 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) samba-dc 4.8.3-4.el7, samba-pidl 4.8.3-4.el7, samba-test 4.8.3-4.el7, samba-python 4.8.3-4.el7, samba-dc-libs 4.8.3-4.el7, samba-test-libs 4.8.3-4.el7, +2 more
    +5 more products
    Red Hat Enterprise Linux Server (v. 7) samba 4.8.3-4.el7, samba-libs 4.8.3-4.el7, libwbclient 4.8.3-4.el7, libsmbclient 4.8.3-4.el7, samba-client 4.8.3-4.el7, samba-common 4.8.3-4.el7, +8 more Red Hat Enterprise Linux Server Optional (v. 7) samba-dc 4.8.3-4.el7, samba-pidl 4.8.3-4.el7, samba-test 4.8.3-4.el7, samba-python 4.8.3-4.el7, samba-dc-libs 4.8.3-4.el7, samba-test-libs 4.8.3-4.el7, +3 more Red Hat Enterprise Linux Server Resilient Storage (v. 7) ctdb 4.8.3-4.el7, ctdb-tests 4.8.3-4.el7 Red Hat Enterprise Linux Workstation (v. 7) samba 4.8.3-4.el7, samba-libs 4.8.3-4.el7, libwbclient 4.8.3-4.el7, libsmbclient 4.8.3-4.el7, samba-client 4.8.3-4.el7, samba-common 4.8.3-4.el7, +8 more Red Hat Enterprise Linux Workstation Optional (v. 7) samba-dc 4.8.3-4.el7, samba-pidl 4.8.3-4.el7, samba-test 4.8.3-4.el7, samba-dc-libs 4.8.3-4.el7, samba-test-libs 4.8.3-4.el7, samba-python-test 4.8.3-4.el7, +2 more
    fixed: vendor fix RHSA-2018:3056
  • Red Hat Gluster 3.4 Samba on RHEL-6 ctdb 4.7.5-110.el6rhs, libtdb 1.3.15-4.el6rhs, samba 4.7.5-110.el6rhs, pytalloc 2.1.11-1.el6rhs, libtalloc 2.1.11-1.el6rhs, libtevent 0.9.35-1.el6rhs, +21 more
    fixed: vendor fix RHSA-2018:2612
  • Red Hat Gluster 3.4 Samba on RHEL-7 ctdb 4.7.5-110.el7rhgs, libtdb 1.3.15-4.el7rhgs, samba 4.7.5-110.el7rhgs, pytalloc 2.1.11-1.el7rhgs, libtalloc 2.1.11-1.el7rhgs, libtevent 0.9.35-1.el7rhgs, +21 more
    fixed: vendor fix RHSA-2018:2613
  • Red Hat Enterprise Linux 5 samba, samba3x Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more Red Hat Enterprise Linux 8 ctdb, samba, libnetapi, ctdb-tests, samba-libs, samba-pidl, +24 more
    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

3.10% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.4 CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • The Samba Team samba

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Vulns 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.