EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2569) - Nessus

High Plugin ID: 154000

This page contains detailed information about the EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2569) 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: 154000
Name: EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2569)
Filename: EulerOS_SA-2021-2569.nasl
Vulnerability Published: 2021-07-20
This Plugin Published: 2021-10-12
Last Modification Time: 2022-01-20
Plugin Version: 1.3
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: High
Vulnerability Published: 2021-07-20
Patch Published: 2021-10-12
CVE [?]: CVE-2021-21781, CVE-2021-33909
CPE [?]: cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:kernel, p-cpe:/a:huawei:euleros:kernel-tools, p-cpe:/a:huawei:euleros:kernel-tools-libs, p-cpe:/a:huawei:euleros:python3-perf
Exploited by Malware: True

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 :

- An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a processs memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11 (CVE-2021-21781)

- fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05. (CVE-2021-33909)

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 SP9 : kernel (EulerOS-SA-2021-2569) vulnerability:

GitHub: https://github.com/AlAIAL90/CVE-2021-33909
[CVE-2021-33909: PoC for exploiting CVE-2021-33909 : fs/seq_file.c in the Linux kernel 3.16 through ...]
GitHub: https://github.com/AmIAHuman/CVE-2021-33909
[CVE-2021-33909: Sequoia exploit (7/20/21)]
GitHub: https://github.com/ChoKyuWon/exploit_articles
[CVE-2021-33909]
GitHub: https://github.com/EGI-Federation/SVG-advisories
[CVE-2021-33909]
GitHub: https://github.com/H0j3n/EzpzCheatSheet
[CVE-2021-33909]
GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
[CVE-2021-33909]
GitHub: https://github.com/gitezri/LinuxVulnerabilities
[CVE-2021-33909]
GitHub: https://github.com/hac425xxx/heap-exploitation-in-real-world
[CVE-2021-33909]
GitHub: https://github.com/ikramimamoglu/AmIAHuman-CVE-2021-33909
[CVE-2021-33909]
GitHub: https://github.com/joydo/CVE-Writeups
[CVE-2021-33909]
GitHub: https://github.com/kaosagnt/ansible-everyday
[CVE-2021-33909]
GitHub: https://github.com/sfowl/deep-directory
[CVE-2021-33909]
GitHub: https://github.com/xairy/linux-kernel-exploitation
[CVE-2021-33909]
GitHub: https://github.com/baerwolf/cve-2021-33909
[CVE-2021-33909: This module fixes an issue in the kernels filesystem layer (CVE-2021-33909) by ...]
GitHub: https://github.com/bbinfosec43/CVE-2021-33909
[CVE-2021-33909: Exploit code for CVE-2021-33909,Just a dump of removed https://github.com/AmIAHuman/ ...]
GitHub: https://github.com/ChrisTheCoolHut/CVE-2021-33909
[CVE-2021-33909: CVE-2021-33909 Sequoia]
GitHub: https://github.com/Liang2580/CVE-2021-33909
[CVE-2021-33909: Sequoia exploit (7/20/21)]

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-2021-33909
CVSS V2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	10.0
Exploitability Subscore:	3.9
CVSS Temporal Score:	6.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.3 (Medium)

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

CVSS Base Score:	7.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.8
CVSS Temporal Score:	7.5 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.5 (High)

STIG Severity [?]: II
STIG Risk Rating: 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(154000);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/20");

  script_cve_id("CVE-2021-21781", "CVE-2021-33909");
  script_xref(name:"IAVA", value:"2021-A-0350");

  script_name(english:"EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2569)");

  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 :

  - An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66
    and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read
    the contents of the sigpage, which can leak kernel memory contents. An attacker can read a processs
    memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222
    4.19.177 5.4.99 5.10.17 5.11 (CVE-2021-21781)

  - fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer
    allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an
    unprivileged user, aka CID-8cae8cd89f05. (CVE-2021-33909)

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-2021-2569
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?54552b97");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-33909");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/10/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/10/12");

  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-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:python3-perf");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/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 SP9");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(9)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9", "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 ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);

var flag = 0;

var pkgs = [
  "kernel-4.19.90-vhulk2103.1.0.h551.eulerosv2r9",
  "kernel-tools-4.19.90-vhulk2103.1.0.h551.eulerosv2r9",
  "kernel-tools-libs-4.19.90-vhulk2103.1.0.h551.eulerosv2r9",
  "python3-perf-4.19.90-vhulk2103.1.0.h551.eulerosv2r9"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"9", 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, "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-2021-2569.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\EulerOS_SA-2021-2569.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/EulerOS_SA-2021-2569.nasl

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How to Run

Here is how to run the EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2569) 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 SP9 : kernel (EulerOS-SA-2021-2569) plugin ID 154000.
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-2021-2569.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a EulerOS_SA-2021-2569.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-2021-2569.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-2021-2569.nasl -t <IP/HOST>

Go back to menu.

References

IAVA | Information Assurance Vulnerability Alert:

2021-A-0350

See also:

Similar and related Nessus plugins:

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152459 - openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2645-1)
152464 - Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9407)
152465 - Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9410)
152467 - openSUSE 15 Security Update : kernel (openSUSE-SU-2021:1142-1)
152478 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2645-1)
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153129 - Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-5017-1)
153130 - Ubuntu 16.04 LTS / 18.04 LTS / 21.04 : Linux kernel vulnerability (USN-5014-1)
153148 - Debian DLA-2714-1 : linux-4.19 - LTS security update
153610 - EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-2465)
153692 - EulerOS 2.0 SP5 : kernel (EulerOS-SA-2021-2502)
154001 - EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2570)
154404 - EulerOS 2.0 SP3 : kernel (EulerOS-SA-2021-2588)
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155787 - RHEL 6 : kernel (RHSA-2021:2735)
155824 - openSUSE 15 Security Update : kernel (openSUSE-SU-2021:3876-1)
155840 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:3876-1)
156347 - EulerOS Virtualization 3.0.2.0 : kernel (EulerOS-SA-2021-2818)
156431 - EulerOS 2.0 SP5 : kernel (EulerOS-SA-2021-2934)
156534 - EulerOS Virtualization 3.0.2.6 : kernel (EulerOS-SA-2021-2857)
157284 - Slackware Linux 14.2 kernel-generic Multiple Vulnerabilities (SSA:2022-031-01)
157560 - AlmaLinux 8 : kernel (ALSA-2021:2714)
157817 - Rocky Linux 8 : kernel (RLSA-2021:2714)
158016 - EulerOS Virtualization 3.0.6.0 : kernel (EulerOS-SA-2022-1070)
158040 - EulerOS Virtualization 3.0.6.6 : kernel (EulerOS-SA-2022-1155)
160438 - Amazon Linux 2 : kernel (ALASKERNEL-5.4-2022-005)
160439 - Amazon Linux 2 : kernel (ALASKERNEL-5.10-2022-003)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file EulerOS_SA-2021-2569.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

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EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2569) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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