The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4463-1 advisory.
An issue was discovered in the Linux kernel through 5.6.11. btree_gc_coalesce in drivers/md/bcache/btree.c has a deadlock if a coalescing operation fails. (CVE-2020-12771)
In the Linux kernel 4.4 through 5.7.6, usbtest_disconnect in drivers/usb/misc/usbtest.c has a memory leak, aka CID-28ebeb8db770. (CVE-2020-15393)
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-4463-1. 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(139662);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");
script_cve_id("CVE-2020-12771", "CVE-2020-15393");
script_xref(name:"USN", value:"4463-1");
script_name(english:"Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4463-1)");
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-4463-1 advisory.
- An issue was discovered in the Linux kernel through 5.6.11. btree_gc_coalesce in drivers/md/bcache/btree.c
has a deadlock if a coalescing operation fails. (CVE-2020-12771)
- In the Linux kernel 4.4 through 5.7.6, usbtest_disconnect in drivers/usb/misc/usbtest.c has a memory leak,
aka CID-28ebeb8db770. (CVE-2020-15393)
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-4463-1");
script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/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:N/I:N/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-2020-12771");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-15393");
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:"2020/05/09");
script_set_attribute(attribute:"patch_publication_date", value:"2020/08/18");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/08/18");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1078-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1112-aws");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1137-raspi2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1141-snapdragon");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-generic");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-generic-lpae");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-lowlatency");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc-e500mc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc-smp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc64-emb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc64-smp");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
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': '4.4.0-187',
'generic-lpae': '4.4.0-187',
'lowlatency': '4.4.0-187',
'powerpc-e500mc': '4.4.0-187',
'powerpc-smp': '4.4.0-187',
'powerpc64-emb': '4.4.0-187',
'powerpc64-smp': '4.4.0-187',
'kvm': '4.4.0-1078',
'aws': '4.4.0-1112',
'raspi2': '4.4.0-1137',
'snapdragon': '4.4.0-1141'
}
}
};
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-4463-1');
}
if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
var cve_list = make_list('CVE-2020-12771', 'CVE-2020-15393');
if (ksplice_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4463-1');
}
else
{
extra = extra + ksplice_reporting_text();
}
}
if (extra) {
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : extra
);
exit(0);
}
Vendor | Product | Version | CPE |
---|---|---|---|
canonical | ubuntu_linux | linux-image-4.4.0-1078-kvm | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1078-kvm |
canonical | ubuntu_linux | linux-image-4.4.0-1112-aws | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1112-aws |
canonical | ubuntu_linux | linux-image-4.4.0-1137-raspi2 | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1137-raspi2 |
canonical | ubuntu_linux | linux-image-4.4.0-1141-snapdragon | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1141-snapdragon |
canonical | ubuntu_linux | linux-image-4.4.0-187-generic | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-generic |
canonical | ubuntu_linux | linux-image-4.4.0-187-generic-lpae | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-generic-lpae |
canonical | ubuntu_linux | linux-image-4.4.0-187-lowlatency | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-lowlatency |
canonical | ubuntu_linux | linux-image-4.4.0-187-powerpc-e500mc | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc-e500mc |
canonical | ubuntu_linux | linux-image-4.4.0-187-powerpc-smp | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc-smp |
canonical | ubuntu_linux | linux-image-4.4.0-187-powerpc64-emb | p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc64-emb |