USN-5142-2

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Source

https://ubuntu.com/security/notices/USN-5142-2

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5142-2.json

JSON Data

https://api.osv.dev/v1/vulns/USN-5142-2

Published

2021-12-06T14:57:18Z

Modified

2026-02-10T04:42:23Z

Summary

samba regressions

Details

USN-5142-1 fixed vulnerabilities in Samba. Some of the upstream changes introduced regressions in name mapping and backups.

Please see the following upstream bugs for more information: https://bugzilla.samba.org/showbug.cgi?id=14901 https://bugzilla.samba.org/showbug.cgi?id=14918

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 correctly sandbox Kerberos tickets issues by an RODC. An RODC could print administrator tickets, contrary to expectations. (CVE-2020-25718)

Andrew Bartlett discovered that Samba incorrectly handled Kerberos tickets. Delegated administrators could possibly use this issue to impersonate accounts, leading to total domain compromise. (CVE-2020-25719)

Andrew Bartlett discovered that Samba did not provide stable AD identifiers to Kerberos acceptors. (CVE-2020-25721)

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)

Stefan Metzmacher discovered that Samba incorrectly handled certain large DCE/RPC requests. A remote attacker could possibly use this issue to bypass signature requirements. (CVE-2021-23192)

William Ross discovered that Samba incorrectly handled memory. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly escalate privileges. (CVE-2021-3738)

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:20.04:LTS / samba

Package

Name: samba
Purl: pkg:deb/ubuntu/samba@2:4.13.14+dfsg-0ubuntu0.20.04.3?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2:4.13.14+dfsg-0ubuntu0.20.04.3

Affected versions

2:4.*

2:4.10.7+dfsg-0ubuntu2

2:4.10.7+dfsg-0ubuntu3

2:4.11.1+dfsg-3ubuntu1

2:4.11.1+dfsg-3ubuntu2

2:4.11.1+dfsg-3ubuntu4

2:4.11.5+dfsg-1ubuntu1

2:4.11.5+dfsg-1ubuntu2

2:4.11.6+dfsg-0ubuntu1

2:4.11.6+dfsg-0ubuntu1.1

2:4.11.6+dfsg-0ubuntu1.2

2:4.11.6+dfsg-0ubuntu1.3

2:4.11.6+dfsg-0ubuntu1.4

2:4.11.6+dfsg-0ubuntu1.5

2:4.11.6+dfsg-0ubuntu1.6

2:4.11.6+dfsg-0ubuntu1.8

2:4.11.6+dfsg-0ubuntu1.9

2:4.11.6+dfsg-0ubuntu1.10

2:4.13.14+dfsg-0ubuntu0.20.04.1

2:4.13.14+dfsg-0ubuntu0.20.04.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "ctdb"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "libnss-winbind"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "libpam-winbind"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "libsmbclient"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "libsmbclient-dev"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "libwbclient-dev"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "libwbclient0"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "python3-samba"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "registry-tools"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "samba"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "samba-common"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "samba-common-bin"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "samba-dev"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "samba-dsdb-modules"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "samba-libs"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "samba-testsuite"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "samba-vfs-modules"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "smbclient"
        },
        {
            "binary_version": "2:4.13.14+dfsg-0ubuntu0.20.04.3",
            "binary_name": "winbind"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [],
    "ecosystem": "Ubuntu:20.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5142-2.json"