Debian DSA-5015-1 : samba - security update

high Nessus Plugin ID 214602

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5015 advisory.

Andrew Bartlett discovered that Samba, a SMB/CIFS file, print, and login server for Unix, may map domain users to local users in an undesired way. This could allow a user in an AD domain to potentially become root on domain members. A new parameter min domain uid (default 1000) has been added to specify the minimum uid allowed when mapping a local account to a domain account. Further details and workarounds can be found in the upstream advisory https://www.samba.org/samba/security/CVE-2020-25717.html For the oldstable distribution (buster), this problem has been fixed in version 2:4.9.5+dfsg-5+deb10u2.
Additionally the update mitigates CVE-2020-25722. Unfortunately the changes required to fix additional CVEs affecting Samba as an AD-compatible domain controller are too invasive to be backported. Thus users using Samba as an AD-compatible domain controller are encouraged to migrate to Debian bullseye. From this point onwards AD domain controller setups are no longer supported in Debian oldstable. We recommend that you upgrade your samba packages. For the detailed security status of samba please refer to its security tracker page at: https://security-tracker.debian.org/tracker/samba

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the samba packages.

Plugin Details

Severity: High

ID: 214602

File Name: debian_DSA-5015.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 1/24/2025

Updated: 1/24/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:N

CVSS Score Source: CVE-2020-25717

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2020-25722

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libpam-winbind, p-cpe:/a:debian:debian_linux:libparse-pidl-perl, p-cpe:/a:debian:debian_linux:python-samba, p-cpe:/a:debian:debian_linux:samba-dsdb-modules, p-cpe:/a:debian:debian_linux:ctdb, p-cpe:/a:debian:debian_linux:smbclient, p-cpe:/a:debian:debian_linux:winbind, p-cpe:/a:debian:debian_linux:libsmbclient, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:samba-dev, p-cpe:/a:debian:debian_linux:samba-libs, p-cpe:/a:debian:debian_linux:samba, p-cpe:/a:debian:debian_linux:registry-tools, p-cpe:/a:debian:debian_linux:samba-common-bin, p-cpe:/a:debian:debian_linux:libwbclient-dev, p-cpe:/a:debian:debian_linux:samba-vfs-modules, p-cpe:/a:debian:debian_linux:samba-testsuite, p-cpe:/a:debian:debian_linux:libwbclient0, p-cpe:/a:debian:debian_linux:libsmbclient-dev, p-cpe:/a:debian:debian_linux:libnss-winbind, p-cpe:/a:debian:debian_linux:samba-common

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 11/30/2021

Vulnerability Publication Date: 11/9/2021

Reference Information

CVE: CVE-2020-25717, CVE-2020-25722

Detections

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