Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1) - Nessus

High Plugin ID: 149411

This page contains detailed information about the Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1) 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: 149411
Name: Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1)
Filename: ubuntu_USN-4949-1.nasl
Vulnerability Published: 2021-02-16
This Plugin Published: 2021-05-12
Last Modification Time: 2021-09-03
Plugin Version: 1.4
Plugin Type: local
Plugin Family: Ubuntu Local Security Checks
Dependencies: linux_alt_patch_detect.nasl, ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Vulnerability Information

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 20.04 LTS / 20.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4949-1 advisory.

- A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau driver functionality in versions prior to 5.12-rc1 in the way the user calls ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC. This flaw allows a local user to crash the system. (CVE-2020-25639)

- An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c. (CVE-2021-26930)

- An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c. (CVE-2021-26931)

- An issue was discovered in the Linux kernel through 5.11.6. fastrpc_internal_invoke in drivers/misc/fastrpc.c does not prevent user applications from sending kernel RPC messages, aka CID-20c40794eb85. This is a related issue to CVE-2019-2308. (CVE-2021-28375)

- An issue was discovered in the Linux kernel through 5.11.10. drivers/net/ethernet/freescale/gianfar.c in the Freescale Gianfar Ethernet driver allows attackers to cause a system crash because a negative fragment size is calculated in situations involving an rx queue overrun when jumbo packets are used and NAPI is enabled, aka CID-d8861bab48b6. (CVE-2021-29264)

- An issue was discovered in the Linux kernel before 5.11.7. usbip_sockfd_store in drivers/usb/usbip/stub_dev.c allows attackers to cause a denial of service (GPF) because the stub-up sequence has race conditions during an update of the local and shared status, aka CID-9380afd6df70. (CVE-2021-29265)

- An issue was discovered in the Linux kernel before 5.11.9. drivers/vhost/vdpa.c has a use-after-free because v->config_ctx has an invalid value upon re-opening a character device, aka CID-f6bbf0010ba0. (CVE-2021-29266)

- An issue was discovered in the Linux kernel before 5.11.11. tipc_nl_retrieve_key in net/tipc/node.c does not properly validate certain data sizes, aka CID-0217ed2848e8. (CVE-2021-29646)

- An issue was discovered in the Linux kernel before 5.11.11. The netfilter subsystem allows attackers to cause a denial of service (panic) because net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h lack a full memory barrier upon the assignment of a new table value, aka CID-175e476b8cdf. (CVE-2021-29650)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1) vulnerability:

Metasploit: exploit/linux/local/cve_2021_3490_ebpf_alu32_bounds_check_lpe
[Linux eBPF ALU32 32-bit Invalid Bounds Tracking LPE]
GitHub: https://github.com/0xsyr0/OSCP
[CVE-2021-3490]
GitHub: https://github.com/Al1ex/LinuxEelvation
[CVE-2021-3490]
GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
[CVE-2021-3490]
GitHub: https://github.com/bsauce/kernel-exploit-factory
[CVE-2021-3490]
GitHub: https://github.com/bsauce/kernel-security-learning
[CVE-2021-3490]
GitHub: https://github.com/chompie1337/Linux_LPE_eBPF_CVE-2021-3490
[CVE-2021-3490]
GitHub: https://github.com/goldenscale/GS_GithubMirror
[CVE-2021-3490]
GitHub: https://github.com/joydo/CVE-Writeups
[CVE-2021-3490]
GitHub: https://github.com/xairy/linux-kernel-exploitation
[CVE-2021-3490]

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-2021-3491
CVSS V2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	10.0
Exploitability Subscore:	3.9
CVSS Temporal Score:	6.0 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.0 (Medium)

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

CVSS Base Score:	8.8 (High)
Impact Subscore:	6.0
Exploitability Subscore:	2.0
CVSS Temporal Score:	8.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.2 (High)

Go back to menu.

Plugin Source

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4949-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

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

if (description)
{
  script_id(149411);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/09/03");

  script_cve_id(
    "CVE-2020-25639",
    "CVE-2021-3489",
    "CVE-2021-3490",
    "CVE-2021-3491",
    "CVE-2021-26930",
    "CVE-2021-26931",
    "CVE-2021-28375",
    "CVE-2021-29264",
    "CVE-2021-29265",
    "CVE-2021-29266",
    "CVE-2021-29646",
    "CVE-2021-29650"
  );
  script_xref(name:"USN", value:"4949-1");

  script_name(english:"Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 20.04 LTS / 20.10 host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-4949-1 advisory.

  - A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau driver functionality in
    versions prior to 5.12-rc1 in the way the user calls ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC. This flaw
    allows a local user to crash the system. (CVE-2020-25639)

  - An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to
    the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be
    encountered. In one case, an error encountered earlier might be discarded by later processing, resulting
    in the caller assuming successful mapping, and hence subsequent operations trying to access space that
    wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery
    from the error. This affects drivers/block/xen-blkback/blkback.c. (CVE-2021-26930)

  - An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI
    backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially
    being at least under the influence of guests (such as out of memory conditions), it isn't correct to
    assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running
    in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.
    (CVE-2021-26931)

  - An issue was discovered in the Linux kernel through 5.11.6. fastrpc_internal_invoke in
    drivers/misc/fastrpc.c does not prevent user applications from sending kernel RPC messages, aka
    CID-20c40794eb85. This is a related issue to CVE-2019-2308. (CVE-2021-28375)

  - An issue was discovered in the Linux kernel through 5.11.10. drivers/net/ethernet/freescale/gianfar.c in
    the Freescale Gianfar Ethernet driver allows attackers to cause a system crash because a negative fragment
    size is calculated in situations involving an rx queue overrun when jumbo packets are used and NAPI is
    enabled, aka CID-d8861bab48b6. (CVE-2021-29264)

  - An issue was discovered in the Linux kernel before 5.11.7. usbip_sockfd_store in
    drivers/usb/usbip/stub_dev.c allows attackers to cause a denial of service (GPF) because the stub-up
    sequence has race conditions during an update of the local and shared status, aka CID-9380afd6df70.
    (CVE-2021-29265)

  - An issue was discovered in the Linux kernel before 5.11.9. drivers/vhost/vdpa.c has a use-after-free
    because v->config_ctx has an invalid value upon re-opening a character device, aka CID-f6bbf0010ba0.
    (CVE-2021-29266)

  - An issue was discovered in the Linux kernel before 5.11.11. tipc_nl_retrieve_key in net/tipc/node.c does
    not properly validate certain data sizes, aka CID-0217ed2848e8. (CVE-2021-29646)

  - An issue was discovered in the Linux kernel before 5.11.11. The netfilter subsystem allows attackers to
    cause a denial of service (panic) because net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h
    lack a full memory barrier upon the assignment of a new table value, aka CID-175e476b8cdf.
    (CVE-2021-29650)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-4949-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected 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:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3491");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Linux eBPF ALU32 32-bit Invalid Bounds Tracking LPE');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-1024-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-1024-raspi-nolpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-1027-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-1029-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-1031-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-1032-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-1033-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-53-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-53-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-53-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-53-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-64k-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-64k-hwe-20.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-20.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-20.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-20.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oem-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-raspi-nolpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-20.04-edge");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2021 Canonical, Inc. / NASL script (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "linux_alt_patch_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('audit.inc');
include('ubuntu.inc');
include('ksplice.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item('Host/Ubuntu/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
release = chomp(release);
if (! preg(pattern:"^(20\.04|20\.10)$", string:release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 20.10', 'Ubuntu ' + release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  rm_kb_item(name:'Host/uptrack-uname-r');
  cve_list = make_list('CVE-2020-25639', 'CVE-2021-3489', 'CVE-2021-3490', 'CVE-2021-3491', 'CVE-2021-26930', 'CVE-2021-26931', 'CVE-2021-28375', 'CVE-2021-29264', 'CVE-2021-29265', 'CVE-2021-29266', 'CVE-2021-29646', 'CVE-2021-29650');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4949-1');
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

pkgs = [
    {'osver': '20.04', 'pkgname': 'linux-image-5.8.0-53-generic', 'pkgver': '5.8.0-53.60~20.04.1'},
    {'osver': '20.04', 'pkgname': 'linux-image-5.8.0-53-generic-64k', 'pkgver': '5.8.0-53.60~20.04.1'},
    {'osver': '20.04', 'pkgname': 'linux-image-5.8.0-53-generic-lpae', 'pkgver': '5.8.0-53.60~20.04.1'},
    {'osver': '20.04', 'pkgname': 'linux-image-5.8.0-53-lowlatency', 'pkgver': '5.8.0-53.60~20.04.1'},
    {'osver': '20.04', 'pkgname': 'linux-image-generic-64k-hwe-20.04', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-generic-64k-hwe-20.04-edge', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-generic-hwe-20.04', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-generic-hwe-20.04-edge', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-generic-lpae-hwe-20.04', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-generic-lpae-hwe-20.04-edge', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-lowlatency-hwe-20.04', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-lowlatency-hwe-20.04-edge', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-virtual-hwe-20.04', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.04', 'pkgname': 'linux-image-virtual-hwe-20.04-edge', 'pkgver': '5.8.0.53.60~20.04.37'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-1024-raspi', 'pkgver': '5.8.0-1024.27'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-1024-raspi-nolpae', 'pkgver': '5.8.0-1024.27'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-1027-kvm', 'pkgver': '5.8.0-1027.29'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-1029-oracle', 'pkgver': '5.8.0-1029.30'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-1031-gcp', 'pkgver': '5.8.0-1031.32'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-1032-azure', 'pkgver': '5.8.0-1032.34'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-1033-aws', 'pkgver': '5.8.0-1033.35'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-53-generic', 'pkgver': '5.8.0-53.60'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-53-generic-64k', 'pkgver': '5.8.0-53.60'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-53-generic-lpae', 'pkgver': '5.8.0-53.60'},
    {'osver': '20.10', 'pkgname': 'linux-image-5.8.0-53-lowlatency', 'pkgver': '5.8.0-53.60'},
    {'osver': '20.10', 'pkgname': 'linux-image-aws', 'pkgver': '5.8.0.1033.35'},
    {'osver': '20.10', 'pkgname': 'linux-image-azure', 'pkgver': '5.8.0.1032.32'},
    {'osver': '20.10', 'pkgname': 'linux-image-gcp', 'pkgver': '5.8.0.1031.31'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic-64k', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic-64k-hwe-20.04', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic-64k-hwe-20.04-edge', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic-hwe-20.04', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic-hwe-20.04-edge', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic-lpae', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic-lpae-hwe-20.04', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-generic-lpae-hwe-20.04-edge', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-gke', 'pkgver': '5.8.0.1031.31'},
    {'osver': '20.10', 'pkgname': 'linux-image-kvm', 'pkgver': '5.8.0.1027.29'},
    {'osver': '20.10', 'pkgname': 'linux-image-lowlatency', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-lowlatency-hwe-20.04', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-lowlatency-hwe-20.04-edge', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-oem-20.04', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-oracle', 'pkgver': '5.8.0.1029.28'},
    {'osver': '20.10', 'pkgname': 'linux-image-raspi', 'pkgver': '5.8.0.1024.27'},
    {'osver': '20.10', 'pkgname': 'linux-image-raspi-nolpae', 'pkgver': '5.8.0.1024.27'},
    {'osver': '20.10', 'pkgname': 'linux-image-virtual', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-virtual-hwe-20.04', 'pkgver': '5.8.0.53.58'},
    {'osver': '20.10', 'pkgname': 'linux-image-virtual-hwe-20.04-edge', 'pkgver': '5.8.0.53.58'}
];

flag = 0;
foreach package_array ( pkgs ) {
  osver = NULL;
  pkgname = NULL;
  pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'linux-image-5.8.0-1024-raspi / linux-image-5.8.0-1024-raspi-nolpae / etc');
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/ubuntu_USN-4949-1.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\ubuntu_USN-4949-1.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/ubuntu_USN-4949-1.nasl

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How to Run

Here is how to run the Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1) 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 Ubuntu Local Security Checks plugin family.
On the right side table select Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1) plugin ID 149411.
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 ubuntu_USN-4949-1.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a ubuntu_USN-4949-1.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - ubuntu_USN-4949-1.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 ubuntu_USN-4949-1.nasl -t <IP/HOST>

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References

USN | Ubuntu Security Notice:

4949-1

See also:

Similar and related Nessus plugins:

147586 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:0740-1)
147591 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:0735-1)
147914 - Amazon Linux 2 : kernel (ALAS-2021-1616)
147919 - Amazon Linux AMI : kernel (ALAS-2021-1487)
148254 - Debian DLA-2610-1 : linux-4.19 security update
148350 - Photon OS 4.0: Linux PHSA-2021-4.0-0007
148438 - openSUSE Security Update : the Linux Kernel (openSUSE-2021-532)
148458 - Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9141)
148459 - Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9140)
148509 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1175-1)
148604 - EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-1751)
148698 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1211-1)
148700 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1210-1)
148747 - SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:1238-1)
148919 - Amazon Linux 2 : kernel (ALAS-2021-1627)
149406 - Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1)
149407 - Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4948-1)
149437 - Photon OS 4.0: Linux PHSA-2021-4.0-0023
149456 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1572-1)
149457 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1571-1)
149462 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1573-1)
149463 - SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:1574-1)
149487 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1595-1)
149491 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1596-1)
149584 - openSUSE Security Update : the Linux Kernel (openSUSE-2021-716)
149633 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1617-1)
149716 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1623-1)
149717 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1624-1)
149892 - openSUSE Security Update : the Linux Kernel (openSUSE-2021-758)
150214 - EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1929)
150233 - Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4982-1)
150253 - EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-1971)
150271 - EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-1967)
150315 - openSUSE Security Update : the Linux Kernel (openSUSE-2021-843)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ubuntu_USN-4949-1.nasl version 1.4. For more plugins, visit the Nessus Plugin Library.

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Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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