EulerOS 2.0 SP5 : expat (EulerOS-SA-2022-1529) - Nessus

High Plugin ID: 160127

This page contains detailed information about the EulerOS 2.0 SP5 : expat (EulerOS-SA-2022-1529) 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: 160127
Name: EulerOS 2.0 SP5 : expat (EulerOS-SA-2022-1529)
Filename: EulerOS_SA-2022-1529.nasl
Vulnerability Published: 2022-01-01
This Plugin Published: 2022-04-25
Last Modification Time: 2022-04-25
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/sp, Host/local_checks_enabled
Excluded KB Items: Host/EulerOS/uvp_version

Vulnerability Information

Severity: High
Vulnerability Published: 2022-01-01
Patch Published: 2022-04-25
CVE [?]: CVE-2021-45960, CVE-2022-23852, CVE-2022-23990, CVE-2022-25235, CVE-2022-25236
CPE [?]: cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:expat, p-cpe:/a:huawei:euleros:expat-devel, p-cpe:/a:huawei:euleros:expat-static

Synopsis

The remote EulerOS host is missing multiple security updates.

Description

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

- In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory). (CVE-2021-45960)

- Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero XML_CONTEXT_BYTES. (CVE-2022-23852)

- Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function. (CVE-2022-23990)

- xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context. (CVE-2022-25235)

- xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs. (CVE-2022-25236)

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 expat 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 2.0 SP5 : expat (EulerOS-SA-2022-1529) vulnerability:

GitHub: https://github.com/nanopathi/external_expat_AOSP10_r33_CVE-2021-45960
[CVE-2021-45960]
GitHub: https://github.com/Nivaskumark/expat_A10_r33_2_2_6_CVE-2022-23990
[CVE-2022-23990]
GitHub: https://github.com/Satheesh575555/external_expat_AOSP10_r33_CVE-2022-23990
[CVE-2022-23990]
GitHub: https://github.com/Satheesh575555/external_expat_AOSP10_r33_CVE-2022-25236
[CVE-2022-25236]

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-2021-45960
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:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS Base Score:	8.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	2.8
CVSS Temporal Score:	7.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.7 (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(160127);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/25");

  script_cve_id(
    "CVE-2021-45960",
    "CVE-2022-23852",
    "CVE-2022-23990",
    "CVE-2022-25235",
    "CVE-2022-25236"
  );

  script_name(english:"EulerOS 2.0 SP5 : expat (EulerOS-SA-2022-1529)");

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

  - In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in
    xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).
    (CVE-2021-45960)

  - Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with
    a nonzero XML_CONTEXT_BYTES. (CVE-2022-23852)

  - Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function. (CVE-2022-23990)

  - xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks
    for whether a UTF-8 character is valid in a certain context. (CVE-2022-25235)

  - xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters
    into namespace URIs. (CVE-2022-25236)

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-2022-1529
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?01c06648");
  script_set_attribute(attribute:"solution", value:
"Update the affected expat 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:L/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-2021-45960");

  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:"2022/01/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/04/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/04/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:expat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:expat-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:expat-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  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/sp");
  script_exclude_keys("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 (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP5");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(5)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP5");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP5", "EulerOS UVP " + uvp);

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 = [
  "expat-2.1.0-10.h11.eulerosv2r7",
  "expat-devel-2.1.0-10.h11.eulerosv2r7",
  "expat-static-2.1.0-10.h11.eulerosv2r7"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"5", 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, "expat");
}

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-2022-1529.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\EulerOS_SA-2022-1529.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/EulerOS_SA-2022-1529.nasl

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How to Run

Here is how to run the EulerOS 2.0 SP5 : expat (EulerOS-SA-2022-1529) 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 SP5 : expat (EulerOS-SA-2022-1529) plugin ID 160127.
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-2022-1529.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a EulerOS_SA-2022-1529.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-2022-1529.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-2022-1529.nasl -t <IP/HOST>

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References

See also:

Similar and related Nessus plugins:

159166 - RHEL 8 : expat (RHSA-2022:1012)
159222 - RHEL 8 : Red Hat Virtualization Host security and enhancement update [ovirt-4.4.10] Async #2 (Important) (RHSA-2022:1053)
159240 - EulerOS 2.0 SP8 : expat (EulerOS-SA-2022-1342)
159284 - RHEL 7 : expat (RHSA-2022:1069)
159288 - RHEL 8 : expat (RHSA-2022:1070)
159295 - Oracle Linux 7 : expat (ELSA-2022-1069)
159301 - RHEL 8 : expat (RHSA-2022:1068)
159315 - CentOS 7 : firefox (CESA-2022:0824)
159320 - CentOS 7 : thunderbird (CESA-2022:0850)
159324 - CentOS 7 : expat (CESA-2022:1069)
159388 - SUSE SLES11 Security Update : expat (SUSE-SU-2022:14934-1)
159595 - RHEL 7 : RHV-H security update (redhat-virtualization-host) 4.3.22 (Important) (RHSA-2022:1263)
159688 - RHEL 6 : expat (RHSA-2022:1309)
159785 - EulerOS 2.0 SP9 : expat (EulerOS-SA-2022-1446)
159791 - EulerOS 2.0 SP9 : expat (EulerOS-SA-2022-1425)
159968 - EulerOS 2.0 SP10 : expat (EulerOS-SA-2022-1483)
160019 - EulerOS 2.0 SP10 : expat (EulerOS-SA-2022-1502)
160143 - EulerOS 2.0 SP8 : expat (EulerOS-SA-2022-1562)
160254 - Amazon Linux 2 : expat (ALAS-2022-1788)
160270 - Amazon Linux 2 : thunderbird (ALAS-2022-1779)
160392 - F5 Networks BIG-IP : Multiple Expat vulnerabilities (K19473898)
160396 - F5 Networks BIG-IP : Expat vulnerabilities (K91589041)
160580 - EulerOS Virtualization 2.9.1 : expat (EulerOS-SA-2022-1605)
160602 - EulerOS Virtualization 2.9.0 : expat (EulerOS-SA-2022-1628)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file EulerOS_SA-2022-1529.nasl version 1.2. For more plugins, visit the Nessus Plugin Library.

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EulerOS 2.0 SP5 : expat (EulerOS-SA-2022-1529) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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