EulerOS Virtualization 2.10.0 : samba (EulerOS-SA-2022-1413) - Nessus

High Plugin ID: 159868

This page contains detailed information about the EulerOS Virtualization 2.10.0 : samba (EulerOS-SA-2022-1413) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 159868
Name: EulerOS Virtualization 2.10.0 : samba (EulerOS-SA-2022-1413)
Filename: EulerOS_SA-2022-1413.nasl
Vulnerability Published: 2021-10-12
This Plugin Published: 2022-04-18
Last Modification Time: 2022-04-18
Plugin Version: 1.2
Plugin Type: local
Plugin Family: Huawei Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/uvp_version, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: 2021-10-12
Patch Published: 2022-04-13
CVE [?]: CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-3671, CVE-2021-3738
CPE [?]: cpe:/o:huawei:euleros:uvp:2.10.0, p-cpe:/a:huawei:euleros:samba-client, p-cpe:/a:huawei:euleros:samba-common, p-cpe:/a:huawei:euleros:samba-common-tools, p-cpe:/a:huawei:euleros:samba-libs

Synopsis

The remote EulerOS Virtualization host is missing multiple security updates.

Description

According to the versions of the samba packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

- A flaw was found in the way samba implemented SMB1 authentication. An attacker could use this flaw to retrieve the plaintext password sent over the wire even if Kerberos authentication was required. (CVE-2016-2124)

- A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to cause possible privilege escalation. (CVE-2020-25717)

- A flaw was found in the way samba, as an Active Directory Domain Controller, is able to support an RODC (read-only domain controller). This would allow an RODC to print administrator tickets. (CVE-2020-25718)

- A flaw was found in the way Samba, as an Active Directory Domain Controller, implemented Kerberos name- based authentication. The Samba AD DC, could become confused about the user a ticket represents if it did not strictly require a Kerberos PAC and always use the SIDs found within. The result could include total domain compromise. (CVE-2020-25719)

- Kerberos acceptors need easy access to stable AD identifiers (eg objectSid). Samba as an AD DC now provides a way for Linux applications to obtain a reliable SID (and samAccountName) in issued tickets. (CVE-2020-25721)

- Multiple flaws were found in the way samba AD DC implemented access and conformance checking of stored data. An attacker could use this flaw to cause total domain compromise. (CVE-2020-25722)

- A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server. (CVE-2021-3671)

- In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use- after-free could instead allow different user state to be pointed at and this might allow more privileged access. (CVE-2021-3738)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected samba packages.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (GitHub)
Exploit Ease: Exploits (PoCs) are available

Here's the list of publicly known exploits and PoCs for verifying the EulerOS Virtualization 2.10.0 : samba (EulerOS-SA-2022-1413) vulnerability:

GitHub: https://github.com/jirib/notes
[CVE-2020-25717]
GitHub: https://github.com/dispera/giant-squid
[CVE-2021-3671]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2020-25719
CVSS V2 Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:U/RL:OF/RC:C

CVSS Base Score:	9.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	8.0
CVSS Temporal Score:	6.7 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.7 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.2
CVSS Temporal Score:	6.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.3 (Medium)

STIG Severity [?]: I
STIG Risk Rating: High

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Plugin Source

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(159868);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/18");

  script_cve_id(
    "CVE-2016-2124",
    "CVE-2020-25717",
    "CVE-2020-25718",
    "CVE-2020-25719",
    "CVE-2020-25721",
    "CVE-2020-25722",
    "CVE-2021-3671",
    "CVE-2021-3738"
  );
  script_xref(name:"IAVA", value:"2021-A-0554");

  script_name(english:"EulerOS Virtualization 2.10.0 : samba (EulerOS-SA-2022-1413)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS Virtualization host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the samba packages installed, the EulerOS Virtualization installation on the remote host is
affected by the following vulnerabilities :

  - A flaw was found in the way samba implemented SMB1 authentication. An attacker could use this flaw to
    retrieve the plaintext password sent over the wire even if Kerberos authentication was required.
    (CVE-2016-2124)

  - A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use
    this flaw to cause possible privilege escalation. (CVE-2020-25717)

  - A flaw was found in the way samba, as an Active Directory Domain Controller, is able to support an RODC
    (read-only domain controller). This would allow an RODC to print administrator tickets. (CVE-2020-25718)

  - A flaw was found in the way Samba, as an Active Directory Domain Controller, implemented Kerberos name-
    based authentication. The Samba AD DC, could become confused about the user a ticket represents if it did
    not strictly require a Kerberos PAC and always use the SIDs found within. The result could include total
    domain compromise. (CVE-2020-25719)

  - Kerberos acceptors need easy access to stable AD identifiers (eg objectSid). Samba as an AD DC now
    provides a way for Linux applications to obtain a reliable SID (and samAccountName) in issued tickets.
    (CVE-2020-25721)

  - Multiple flaws were found in the way samba AD DC implemented access and conformance checking of stored
    data. An attacker could use this flaw to cause total domain compromise. (CVE-2020-25722)

  - A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ
    (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.
    (CVE-2021-3671)

  - In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections
    via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb
    database. However while the database was correctly shared, the user credentials state was only pointed at,
    and when one connection within that association group ended, the database would be left pointing at an
    invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use-
    after-free could instead allow different user state to be pointed at and this might allow more privileged
    access. (CVE-2021-3738)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security
advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional
issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2022-1413
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?518bc7dc");
  script_set_attribute(attribute:"solution", value:
"Update the affected samba packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-25719");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/10/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/04/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/04/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-common-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-libs");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.10.0");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/uvp_version");

  exit(0);
}

include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (uvp != "2.10.0") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.10.0");
if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

var flag = 0;

var pkgs = [
  "samba-client-4.11.12-3.h9.eulerosv2r10",
  "samba-common-4.11.12-3.h9.eulerosv2r10",
  "samba-common-tools-4.11.12-3.h9.eulerosv2r10",
  "samba-libs-4.11.12-3.h9.eulerosv2r10"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "samba");
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/EulerOS_SA-2022-1413.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\EulerOS_SA-2022-1413.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/EulerOS_SA-2022-1413.nasl

Go back to menu.

How to Run

Here is how to run the EulerOS Virtualization 2.10.0 : samba (EulerOS-SA-2022-1413) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Huawei Local Security Checks plugin family.
On the right side table select EulerOS Virtualization 2.10.0 : samba (EulerOS-SA-2022-1413) plugin ID 159868.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl EulerOS_SA-2022-1413.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a EulerOS_SA-2022-1413.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - EulerOS_SA-2022-1413.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state EulerOS_SA-2022-1413.nasl -t <IP/HOST>

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References

IAVA | Information Assurance Vulnerability Alert:

2021-A-0554

See also:

Similar and related Nessus plugins:

155015 - Debian DSA-5003-1 : samba - security update
158380 - EulerOS 2.0 SP10 : samba (EulerOS-SA-2022-1246)
158375 - EulerOS 2.0 SP10 : samba (EulerOS-SA-2022-1258)
158550 - EulerOS 2.0 SP9 : samba (EulerOS-SA-2022-1295)
158522 - EulerOS 2.0 SP9 : samba (EulerOS-SA-2022-1311)
159873 - EulerOS Virtualization 2.10.1 : samba (EulerOS-SA-2022-1387)
155177 - openSUSE 15 Security Update : samba and ldb (openSUSE-SU-2021:3647-1)
155620 - Samba 4.13.x < 4.13.14 / 4.14.x < 4.14.10 / 4.15.x < 4.15.2 Multiple Vulnerabilities
155048 - SUSE SLED15 / SLES15 Security Update : samba and ldb (SUSE-SU-2021:3647-1)
155297 - Ubuntu 20.04 LTS / 21.04 / 21.10 : Samba vulnerabilities (USN-5142-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file EulerOS_SA-2022-1413.nasl version 1.2. For more plugins, visit the Nessus Plugin Library.

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EulerOS Virtualization 2.10.0 : samba (EulerOS-SA-2022-1413) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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