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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 8y ago modified 4mo 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

Is CVE-2018-1139 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-2018-1139 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

3.11% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 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.