USN-5174-2

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Source

https://ubuntu.com/security/notices/USN-5174-2

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5174-2.json

JSON Data

https://api.osv.dev/v1/vulns/USN-5174-2

Published

2021-12-13T19:55:15Z

Modified

2026-02-10T04:42:24Z

Summary

samba regression

Details

USN-5174-1 fixed vulnerabilities in Samba. Some of the changes introduced a regression in Kerberos authentication in certain environments.

Please see the following upstream bug for more information: https://bugzilla.samba.org/show_bug.cgi?id=14922

This update fixes the problem.

Original advisory details:

Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client connections. A remote attacker could possibly use this issue to downgrade connections to plaintext authentication. (CVE-2016-2124)

Andrew Bartlett discovered that Samba incorrectly mapping domain users to local users. An authenticated attacker could possibly use this issue to become root on domain members. (CVE-2020-25717)

Andrew Bartlett discovered that Samba did not properly check sensitive attributes. An authenticated attacker could possibly use this issue to escalate privileges. (CVE-2020-25722)

Joseph Sutton discovered that Samba incorrectly handled certain TGS requests. An authenticated attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2021-3671)

The fix for CVE-2020-25717 results in possible behaviour changes that could affect certain environments. Please see the upstream advisory for more information:

https://www.samba.org/samba/security/CVE-2020-25717.html

References

Affected packages

Ubuntu:18.04:LTS / samba

Package

Name: samba
Purl: pkg:deb/ubuntu/samba@2:4.7.6+dfsg~ubuntu-0ubuntu2.27?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2:4.7.6+dfsg~ubuntu-0ubuntu2.27

Affected versions

2:4.*

2:4.6.7+dfsg-1ubuntu3

2:4.7.1+dfsg-1ubuntu1

2:4.7.3+dfsg-1ubuntu1

2:4.7.4+dfsg-1ubuntu1

2:4.7.6+dfsg~ubuntu-0ubuntu1

2:4.7.6+dfsg~ubuntu-0ubuntu2

2:4.7.6+dfsg~ubuntu-0ubuntu2.2

2:4.7.6+dfsg~ubuntu-0ubuntu2.4

2:4.7.6+dfsg~ubuntu-0ubuntu2.5

2:4.7.6+dfsg~ubuntu-0ubuntu2.6

2:4.7.6+dfsg~ubuntu-0ubuntu2.7

2:4.7.6+dfsg~ubuntu-0ubuntu2.9

2:4.7.6+dfsg~ubuntu-0ubuntu2.10

2:4.7.6+dfsg~ubuntu-0ubuntu2.11

2:4.7.6+dfsg~ubuntu-0ubuntu2.13

2:4.7.6+dfsg~ubuntu-0ubuntu2.14

2:4.7.6+dfsg~ubuntu-0ubuntu2.15

2:4.7.6+dfsg~ubuntu-0ubuntu2.16

2:4.7.6+dfsg~ubuntu-0ubuntu2.17

2:4.7.6+dfsg~ubuntu-0ubuntu2.18

2:4.7.6+dfsg~ubuntu-0ubuntu2.19

2:4.7.6+dfsg~ubuntu-0ubuntu2.20

2:4.7.6+dfsg~ubuntu-0ubuntu2.21

2:4.7.6+dfsg~ubuntu-0ubuntu2.23

2:4.7.6+dfsg~ubuntu-0ubuntu2.24

2:4.7.6+dfsg~ubuntu-0ubuntu2.26

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "ctdb"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "libnss-winbind"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "libpam-winbind"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "libparse-pidl-perl"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "libsmbclient"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "libsmbclient-dev"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "libwbclient-dev"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "libwbclient0"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "python-samba"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "registry-tools"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "samba"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "samba-common"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "samba-common-bin"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "samba-dev"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "samba-dsdb-modules"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "samba-libs"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "samba-testsuite"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "samba-vfs-modules"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "smbclient"
        },
        {
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "binary_name": "winbind"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [],
    "ecosystem": "Ubuntu:18.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5174-2.json"