EulerOS 2.0 SP2 : python-lxml (EulerOS-SA-2021-2431) - Nessus

Medium Plugin ID: 153334

This page contains detailed information about the EulerOS 2.0 SP2 : python-lxml (EulerOS-SA-2021-2431) 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: 153334
Name: EulerOS 2.0 SP2 : python-lxml (EulerOS-SA-2021-2431)
Filename: EulerOS_SA-2021-2431.nasl
Vulnerability Published: N/A
This Plugin Published: 2021-09-14
Last Modification Time: 2021-09-16
Plugin Version: 1.2
Plugin Type: local
Plugin Family: Huawei Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/sp, Host/local_checks_enabled
Excluded KB Items: Host/EulerOS/uvp_version

Vulnerability Information

Severity: Medium
Vulnerability Published: N/A
Patch Published: 2021-09-14
CVE [?]: CVE-2020-27783
CPE [?]: cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:python-lxml

Synopsis

The remote EulerOS host is missing a security update.

Description

According to the version of the python-lxml package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

- A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.(CVE-2020-27783)

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 python-lxml package.

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 2.0 SP2 : python-lxml (EulerOS-SA-2021-2431) vulnerability:

GitHub: https://github.com/sonatype-nexus-community/jake
[CVE-2020-27783]

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 V2 Vector [?]: AV:N/AC:M/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C

CVSS Base Score:	4.3 (Medium)
Impact Subscore:	2.9
Exploitability Subscore:	8.6
CVSS Temporal Score:	3.2 (Low)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	3.2 (Low)

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

CVSS Base Score:	6.1 (Medium)
Impact Subscore:	2.7
Exploitability Subscore:	2.8
CVSS Temporal Score:	5.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.3 (Medium)

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Plugin Source

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

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

if (description)
{
  script_id(153334);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/09/16");

  script_cve_id(
    "CVE-2020-27783"
  );

  script_name(english:"EulerOS 2.0 SP2 : python-lxml (EulerOS-SA-2021-2431)");
  script_summary(english:"Checks the rpm output for the updated package.");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"According to the version of the python-lxml package installed, the
EulerOS installation on the remote host is affected by the following
vulnerability :

  - A XSS vulnerability was discovered in python-lxml's
    clean module. The module's parser didn't properly
    imitate browsers, which caused different behaviors
    between the sanitizer and the user's page. A remote
    attacker could exploit this flaw to run arbitrary
    HTML/JS code.(CVE-2020-27783)

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-2021-2431
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2d3409de");
  script_set_attribute(attribute:"solution", value:
"Update the affected python-lxml package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
  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:N/UI:R/S:C/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"patch_publication_date", value:"2021/09/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:python-lxml");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

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

release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(2)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP2");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP2", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

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);

flag = 0;

pkgs = ["python-lxml-3.2.1-4.h3"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"2", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "python-lxml");
}

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-2021-2431.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\EulerOS_SA-2021-2431.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/EulerOS_SA-2021-2431.nasl

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How to Run

Here is how to run the EulerOS 2.0 SP2 : python-lxml (EulerOS-SA-2021-2431) 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 2.0 SP2 : python-lxml (EulerOS-SA-2021-2431) plugin ID 153334.
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-2021-2431.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a EulerOS_SA-2021-2431.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-2021-2431.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-2021-2431.nasl -t <IP/HOST>

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References

See also:

Similar and related Nessus plugins:

150966 - Amazon Linux 2 : python-lxml (ALAS-2021-1666)
149749 - CentOS 8 : python27:2.7 (CESA-2021:1761)
150032 - CentOS 8 : python38:3.8 (CESA-2021:1879)
150045 - CentOS 8 : python-lxml (CESA-2021:1898)
143308 - Debian DLA-2467-2 : lxml regression update
144189 - Debian DSA-4810-1 : lxml - security update
144676 - EulerOS 2.0 SP9 : python-lxml (EulerOS-SA-2021-1016)
144702 - EulerOS 2.0 SP9 : python-lxml (EulerOS-SA-2021-1035)
145738 - EulerOS 2.0 SP8 : python-lxml (EulerOS-SA-2021-1166)
147453 - EulerOS Virtualization for ARM 64 3.0.2.0 : python-lxml (EulerOS-SA-2021-1402)
147527 - EulerOS Virtualization 3.0.2.6 : python-lxml (EulerOS-SA-2021-1420)
147041 - EulerOS Virtualization 3.0.6.6 : python-lxml (EulerOS-SA-2021-1514)
147095 - EulerOS Virtualization for ARM 64 3.0.6.0 : python-lxml (EulerOS-SA-2021-1538)
148061 - EulerOS 2.0 SP5 : python-lxml (EulerOS-SA-2021-1701)
149105 - EulerOS 2.0 SP3 : python-lxml (EulerOS-SA-2021-1839)
151412 - EulerOS Virtualization 3.0.2.2 : python-lxml (EulerOS-SA-2021-2162)
144963 - Fedora 33 : python-lxml (2020-0e055ea503)
144957 - Fedora 32 : python-lxml (2020-307946cfb6)
152764 - Oracle Linux 8 : python27:2.7 (ELSA-2021-1761)
155324 - Oracle Linux 8 : python38:3.8 (ELSA-2021-1879)
149934 - Oracle Linux 8 : python-lxml (ELSA-2021-1898)
160271 - Oracle Linux 8 : ol-automation-manager (ELSA-2022-9341)
152378 - Photon OS 4.0: Python3 PHSA-2021-4.0-0072
149710 - RHEL 8 : python27:2.7 (RHSA-2021:1761)
149708 - RHEL 8 : python38:3.8 (RHSA-2021:1879)
149665 - RHEL 8 : python-lxml (RHSA-2021:1898)
152781 - RHEL 7 : rh-python38 (RHSA-2021:3254)
158799 - SUSE SLED15 / SLES15 Security Update : python-lxml (SUSE-SU-2022:0803-1)
159062 - SUSE SLES12 Security Update : python-lxml (SUSE-SU-2022:0895-1)
144012 - Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : lxml vulnerability (USN-4666-1)
144078 - Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : lxml vulnerability (USN-4666-2)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file EulerOS_SA-2021-2431.nasl version 1.2. For more plugins, visit the Nessus Plugin Library.

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EulerOS 2.0 SP2 : python-lxml (EulerOS-SA-2021-2431) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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