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nessusUbuntu Security Notice (C) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.UBUNTU_USN-4657-1.NASL
HistoryDec 02, 2020 - 12:00 a.m.

Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4657-1)

2020-12-0200:00:00
Ubuntu Security Notice (C) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
49

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

Access Complexity

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

COMPLETE

AV:N/AC:M/Au:S/C:P/I:P/A:C

0.008 Low

EPSS

Percentile

81.7%

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4657-1 advisory.

  • In create_pinctrl of core.c, there is a possible out of bounds read due to a use after free. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-140550171 (CVE-2020-0427)

  • Legacy pairing and secure-connections pairing authentication in Bluetooth BR/EDR Core Specification v5.2 and earlier may allow an unauthenticated user to complete authentication without pairing credentials via adjacent access. An unauthenticated, adjacent attacker could impersonate a Bluetooth BR/EDR master or slave to pair with a previously paired remote device to successfully complete the authentication procedure without knowing the link key. (CVE-2020-10135)

  • Improper access control in BlueZ may allow an unauthenticated user to potentially enable information disclosure via adjacent access. (CVE-2020-12352)

  • A flaw was found in the Linux kernel. A use-after-free memory flaw was found in the perf subsystem allowing a local attacker with permission to monitor perf events to corrupt memory and possibly escalate privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14351)

  • A flaw was found in the Linux kernel in versions before 5.9-rc6. When changing screen size, an out-of- bounds memory write can occur leading to memory corruption or a denial of service. Due to the nature of the flaw, privilege escalation cannot be fully ruled out. (CVE-2020-14390)

  • In the Linux kernel through 5.8.7, local attackers able to inject conntrack netlink configuration could overflow a local buffer, causing crashes or triggering use of incorrect protocol numbers in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c, aka CID-1cc5ef91d2ff.
    (CVE-2020-25211)

  • The rbd block device driver in drivers/block/rbd.c in the Linux kernel through 5.8.9 used incomplete permission checking for access to rbd devices, which could be leveraged by local attackers to map or unmap rbd block devices, aka CID-f44d04e696fe. (CVE-2020-25284)

  • A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7. Memory corruption and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause the system to crash or cause a denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-25643)

  • A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality. (CVE-2020-25645)

  • A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Based Products (RUGGEDCOM RM1224: All versions between v5.0 and v6.4, SCALANCE M-800: All versions between v5.0 and v6.4, SCALANCE S615: All versions between v5.0 and v6.4, SCALANCE SC-600: All versions prior to v2.1.3, SCALANCE W1750D: v8.3.0.1, v8.6.0, and v8.7.0, SIMATIC Cloud Connect 7: All versions, SIMATIC MV500 Family: All versions, SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later, SIMATIC NET CP 1243-7 LTE EU: Version (CVE-2020-25705)

  • A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read kernel memory, aka CID-6735b4632def. (CVE-2020-28915)

  • IBM Power9 (AIX 7.1, 7.2, and VIOS 3.1) processors could allow a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances. IBM X-Force ID: 189296.
    (CVE-2020-4788)

Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4657-1. The text
# itself is copyright (C) Canonical, Inc. See
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(143433);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  script_cve_id(
    "CVE-2020-0427",
    "CVE-2020-4788",
    "CVE-2020-10135",
    "CVE-2020-12352",
    "CVE-2020-14351",
    "CVE-2020-14390",
    "CVE-2020-25211",
    "CVE-2020-25284",
    "CVE-2020-25643",
    "CVE-2020-25645",
    "CVE-2020-25705",
    "CVE-2020-28915"
  );
  script_xref(name:"USN", value:"4657-1");
  script_xref(name:"CEA-ID", value:"CEA-2020-0138");

  script_name(english:"Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4657-1)");

  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 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-4657-1 advisory.

  - In create_pinctrl of core.c, there is a possible out of bounds read due to a use after free. This could
    lead to local information disclosure with no additional execution privileges needed. User interaction is
    not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-140550171
    (CVE-2020-0427)

  - Legacy pairing and secure-connections pairing authentication in Bluetooth BR/EDR Core Specification v5.2
    and earlier may allow an unauthenticated user to complete authentication without pairing credentials via
    adjacent access. An unauthenticated, adjacent attacker could impersonate a Bluetooth BR/EDR master or
    slave to pair with a previously paired remote device to successfully complete the authentication procedure
    without knowing the link key. (CVE-2020-10135)

  - Improper access control in BlueZ may allow an unauthenticated user to potentially enable information
    disclosure via adjacent access. (CVE-2020-12352)

  - A flaw was found in the Linux kernel. A use-after-free memory flaw was found in the perf subsystem
    allowing a local attacker with permission to monitor perf events to corrupt memory and possibly escalate
    privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as
    system availability. (CVE-2020-14351)

  - A flaw was found in the Linux kernel in versions before 5.9-rc6. When changing screen size, an out-of-
    bounds memory write can occur leading to memory corruption or a denial of service. Due to the nature of
    the flaw, privilege escalation cannot be fully ruled out. (CVE-2020-14390)

  - In the Linux kernel through 5.8.7, local attackers able to inject conntrack netlink configuration could
    overflow a local buffer, causing crashes or triggering use of incorrect protocol numbers in
    ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c, aka CID-1cc5ef91d2ff.
    (CVE-2020-25211)

  - The rbd block device driver in drivers/block/rbd.c in the Linux kernel through 5.8.9 used incomplete
    permission checking for access to rbd devices, which could be leveraged by local attackers to map or unmap
    rbd block devices, aka CID-f44d04e696fe. (CVE-2020-25284)

  - A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7. Memory corruption
    and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause
    the system to crash or cause a denial of service. The highest threat from this vulnerability is to data
    confidentiality and integrity as well as system availability. (CVE-2020-25643)

  - A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may
    be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE
    tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from
    this vulnerability is to data confidentiality. (CVE-2020-25645)

  - A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw
    allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that
    relies on UDP source port randomization are indirectly affected as well on the Linux Based Products
    (RUGGEDCOM RM1224: All versions between v5.0 and v6.4, SCALANCE M-800: All versions between v5.0 and v6.4,
    SCALANCE S615: All versions between v5.0 and v6.4, SCALANCE SC-600: All versions prior to v2.1.3, SCALANCE
    W1750D: v8.3.0.1, v8.6.0, and v8.7.0, SIMATIC Cloud Connect 7: All versions, SIMATIC MV500 Family: All
    versions, SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later, SIMATIC NET CP 1243-7
    LTE EU: Version (CVE-2020-25705)

  - A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be
    used by local attackers to read kernel memory, aka CID-6735b4632def. (CVE-2020-28915)

  - IBM Power9 (AIX 7.1, 7.2, and VIOS 3.1) processors could allow a local user to obtain sensitive
    information from the data in the L1 cache under extenuating circumstances. IBM X-Force ID: 189296.
    (CVE-2020-4788)

Note that Nessus has not tested for these issues 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-4657-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/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:L/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-2020-25643");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-14351");

  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:"2020/05/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/12/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/12/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1084-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1118-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1142-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1146-snapdragon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-powerpc64-smp");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 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('debian_package.inc');
include('ksplice.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('16.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var kernel_mappings = {
  '16.04': {
    '4.4.0': {
      'generic': '4.4.0-197',
      'generic-lpae': '4.4.0-197',
      'lowlatency': '4.4.0-197',
      'powerpc-e500mc': '4.4.0-197',
      'powerpc-smp': '4.4.0-197',
      'powerpc64-emb': '4.4.0-197',
      'powerpc64-smp': '4.4.0-197',
      'kvm': '4.4.0-1084',
      'aws': '4.4.0-1118',
      'raspi2': '4.4.0-1142',
      'snapdragon': '4.4.0-1146'
    }
  }
};

var host_kernel_release = get_kb_item('Host/uptrack-uname-r');
if (empty_or_null(host_kernel_release)) host_kernel_release = get_kb_item_or_exit('Host/uname-r');
var host_kernel_base_version = get_kb_item_or_exit('Host/Debian/kernel-base-version');
var host_kernel_type = get_kb_item_or_exit('Host/Debian/kernel-type');
if(empty_or_null(kernel_mappings[os_release][host_kernel_base_version][host_kernel_type])) audit(AUDIT_INST_VER_NOT_VULN, 'kernel ' + host_kernel_release);

var extra = '';
var kernel_fixed_version = kernel_mappings[os_release][host_kernel_base_version][host_kernel_type] + "-" + host_kernel_type;
if (deb_ver_cmp(ver1:host_kernel_release, ver2:kernel_fixed_version) < 0)
{
  extra = extra + 'Running Kernel level of ' + host_kernel_release + ' does not meet the minimum fixed level of ' + kernel_fixed_version + ' for this advisory.\n\n';
}
  else
{
  audit(AUDIT_PATCH_INSTALLED, 'Kernel package for USN-4657-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2020-0427', 'CVE-2020-4788', 'CVE-2020-10135', 'CVE-2020-12352', 'CVE-2020-14351', 'CVE-2020-14390', 'CVE-2020-25211', 'CVE-2020-25284', 'CVE-2020-25643', 'CVE-2020-25645', 'CVE-2020-25705', 'CVE-2020-28915');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4657-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
VendorProductVersionCPE
canonicalubuntu_linux16.04cpe:/o:canonical:ubuntu_linux:16.04:-:lts
canonicalubuntu_linuxlinux-image-4.4.0-1084-kvmp-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1084-kvm
canonicalubuntu_linuxlinux-image-4.4.0-1118-awsp-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1118-aws
canonicalubuntu_linuxlinux-image-4.4.0-1142-raspi2p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1142-raspi2
canonicalubuntu_linuxlinux-image-4.4.0-1146-snapdragonp-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1146-snapdragon
canonicalubuntu_linuxlinux-image-4.4.0-197-genericp-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-generic
canonicalubuntu_linuxlinux-image-4.4.0-197-generic-lpaep-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-generic-lpae
canonicalubuntu_linuxlinux-image-4.4.0-197-lowlatencyp-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-lowlatency
canonicalubuntu_linuxlinux-image-4.4.0-197-powerpc-e500mcp-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-powerpc-e500mc
canonicalubuntu_linuxlinux-image-4.4.0-197-powerpc-smpp-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-197-powerpc-smp
Rows per page:
1-10 of 121

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

Access Complexity

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

COMPLETE

AV:N/AC:M/Au:S/C:P/I:P/A:C

0.008 Low

EPSS

Percentile

81.7%