EulerOS 2.0 SP5 : kernel (EulerOS-SA-2022-1328) - Nessus

High Plugin ID: 159093

This page contains detailed information about the EulerOS 2.0 SP5 : kernel (EulerOS-SA-2022-1328) 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: 159093
Name: EulerOS 2.0 SP5 : kernel (EulerOS-SA-2022-1328)
Filename: EulerOS_SA-2022-1328.nasl
Vulnerability Published: 2021-09-08
This Plugin Published: 2022-03-21
Last Modification Time: 2022-03-23
Plugin Version: 1.3
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: 2021-09-08
Patch Published: 2022-03-21
CVE [?]: CVE-2021-0920, CVE-2021-3653, CVE-2021-4002, CVE-2021-4083, CVE-2021-20321, CVE-2021-45485, CVE-2021-45486
CPE [?]: cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:kernel, p-cpe:/a:huawei:euleros:kernel-devel, p-cpe:/a:huawei:euleros:kernel-headers, p-cpe:/a:huawei:euleros:kernel-tools, p-cpe:/a:huawei:euleros:kernel-tools-libs, p-cpe:/a:huawei:euleros:perf, p-cpe:/a:huawei:euleros:python-perf

Synopsis

The remote EulerOS host is missing multiple security updates.

Description

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

- In unix_scm_to_skb of af_unix.c, there is a possible use after free bug due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-196926917References: Upstream kernel (CVE-2021-0920)

- A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system. (CVE-2021-20321)

- A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the 'int_ctl' field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to 5.14-rc7. (CVE-2021-3653)

- A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data. (CVE-2021-4002)

- A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system. This flaw affects Linux kernel versions prior to 5.16-rc4. (CVE-2021-4083)

- In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses. (CVE-2021-45485)

- In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak because the hash table is very small. (CVE-2021-45486)

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 kernel packages.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the EulerOS 2.0 SP5 : kernel (EulerOS-SA-2022-1328) vulnerability:

GitHub: https://github.com/enterprisemodules/vulnerability_demo
[CVE-2021-0920]
GitHub: https://github.com/Satheesh575555/linux-4.19.72_CVE-2021-45485
[CVE-2021-45485]

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-2021-4083
CVSS V2 Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C

CVSS Base Score:	6.9 (Medium)
Impact Subscore:	10.0
Exploitability Subscore:	3.4
CVSS Temporal Score:	5.4 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.4 (Medium)

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

CVSS Base Score:	7.0 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.0
CVSS Temporal Score:	6.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.3 (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(159093);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/03/23");

  script_cve_id(
    "CVE-2021-0920",
    "CVE-2021-3653",
    "CVE-2021-4002",
    "CVE-2021-4083",
    "CVE-2021-20321",
    "CVE-2021-45485",
    "CVE-2021-45486"
  );

  script_name(english:"EulerOS 2.0 SP5 : kernel (EulerOS-SA-2022-1328)");

  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 kernel packages installed, the EulerOS installation on the remote host is affected by
the following vulnerabilities :

  - In unix_scm_to_skb of af_unix.c, there is a possible use after free bug due to a race condition. This
    could lead to local escalation of privilege with System execution privileges needed. User interaction is
    not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-196926917References:
    Upstream kernel (CVE-2021-0920)

  - A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users
    do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.
    (CVE-2021-20321)

  - A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when
    processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested
    guest (L2). Due to improper validation of the 'int_ctl' field, this issue could allow a malicious L1 to
    enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest
    would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak
    of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to
    5.14-rc7. (CVE-2021-3653)

  - A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some
    regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the
    memory pages. A local user could use this flaw to get unauthorized access to some data. (CVE-2021-4002)

  - A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket
    file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race
    condition. This flaw allows a local user to crash the system or escalate their privileges on the system.
    This flaw affects Linux kernel versions prior to 5.16-rc4. (CVE-2021-4083)

  - In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information
    leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based
    attackers can typically choose among many IPv6 source addresses. (CVE-2021-45485)

  - In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak
    because the hash table is very small. (CVE-2021-45486)

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-2022-1328
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1738d8e3");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-4083");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/09/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/03/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/03/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-tools-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:python-perf");
  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("audit.inc");
include("global_settings.inc");
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 = [
  "kernel-3.10.0-862.14.1.5.h659.eulerosv2r7",
  "kernel-devel-3.10.0-862.14.1.5.h659.eulerosv2r7",
  "kernel-headers-3.10.0-862.14.1.5.h659.eulerosv2r7",
  "kernel-tools-3.10.0-862.14.1.5.h659.eulerosv2r7",
  "kernel-tools-libs-3.10.0-862.14.1.5.h659.eulerosv2r7",
  "perf-3.10.0-862.14.1.5.h659.eulerosv2r7",
  "python-perf-3.10.0-862.14.1.5.h659.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_WARNING,
    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, "kernel");
}

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-2022-1328.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\EulerOS_SA-2022-1328.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/EulerOS_SA-2022-1328.nasl

Go back to menu.

How to Run

Here is how to run the EulerOS 2.0 SP5 : kernel (EulerOS-SA-2022-1328) 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 : kernel (EulerOS-SA-2022-1328) plugin ID 159093.
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-2022-1328.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a EulerOS_SA-2022-1328.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-2022-1328.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-2022-1328.nasl -t <IP/HOST>

Go back to menu.

References

See also:

Similar and related Nessus plugins:

158727 - RHEL 8 : kpatch-patch (RHSA-2022:0772)
158735 - RHEL 8 : kernel-rt (RHSA-2022:0771)
158736 - RHEL 8 : kernel (RHSA-2022:0777)
158748 - SUSE SLES12 Security Update : kernel (SUSE-SU-2022:0762-1)
158756 - SUSE SLES12 Security Update : kernel (SUSE-SU-2022:0756-1)
158761 - Debian DSA-5096-1 : linux - security update
158794 - Oracle Linux 8 : kernel (ELSA-2022-0825)
158805 - RHEL 8 : kernel (RHSA-2022:0823)
158807 - RHEL 8 : kernel (RHSA-2022:0820)
158808 - RHEL 8 : kernel-rt (RHSA-2022:0819)
158813 - RHEL 8 : kernel-rt (RHSA-2022:0821)
158822 - RHEL 8 : kernel (RHSA-2022:0825)
158912 - RHEL 8 : kpatch-patch (RHSA-2022:0849)
158923 - RHEL 8 : kpatch-patch (RHSA-2022:0851)
158924 - RHEL 8 : Red Hat Virtualization Host security and bug fix update [ovirt-4.4.10] Async #1 (Important) (RHSA-2022:0841)
158951 - RHEL 8 : kpatch-patch (RHSA-2022:0925)
159041 - RHEL 8 : kpatch-patch-4_18_0-147_58_1 (RHSA-2022:0958)
159146 - SUSE SLES15 Security Update : kernel (Live Patch 14 for SLE 15 SP3) (SUSE-SU-2022:0615-1)
159149 - SUSE SLES15 Security Update : kernel (Live Patch 10 for SLE 15 SP3) (SUSE-SU-2022:0660-1)
159150 - SUSE SLES15 Security Update : kernel (Live Patch 13 for SLE 15 SP3) (SUSE-SU-2022:0619-1)
159160 - Ubuntu 14.04 LTS / 16.04 LTS : Linux kernel vulnerabilities (USN-5343-1)
159184 - Oracle Linux 8 : Unbreakable Enterprise kernel-container (ELSA-2022-9245)
159186 - Oracle Linux 8 : Unbreakable Enterprise kernel (ELSA-2022-9244)
159262 - EulerOS 2.0 SP8 : kernel (EulerOS-SA-2022-1352)
159302 - CentOS 8 : kernel (CESA-2022:0825)
159310 - RHEL 7 : kpatch-patch (RHSA-2022:1103)
159314 - RHEL 7 : kernel (RHSA-2022:1107)
159319 - RHEL 7 : kernel (RHSA-2022:1106)
159342 - SUSE SLES15 Security Update : kernel (Live Patch 25 for SLE 15 SP2) (SUSE-SU-2022:0996-1)
159352 - SUSE SLES15 Security Update : kernel (Live Patch 15 for SLE 15 SP3) (SUSE-SU-2022:1034-1)
159353 - SUSE SLES15 Security Update : kernel (SUSE-SU-2022:1038-1)
159357 - SUSE SLES15 Security Update : kernel (SUSE-SU-2022:1037-1)
159366 - SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2022:1039-1)
159387 - Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-5361-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file EulerOS_SA-2022-1328.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

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EulerOS 2.0 SP5 : kernel (EulerOS-SA-2022-1328) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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