The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4945-1 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 through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations (as a result of changes to the handling of grant mapping errors). A host OS denial of service may occur during misbehavior of a networking frontend driver. NOTE: this issue exists because of an incomplete fix for CVE-2021-26931.
(CVE-2021-28038)
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)
rtw_wx_set_scan in drivers/staging/rtl8188eu/os_dep/ioctl_linux.c in the Linux kernel through 5.11.6 allows writing beyond the end of the ->ssid[] array. NOTE: from the perspective of kernel.org releases, CVE IDs are not normally used for drivers/staging/* (unfinished work); however, system integrators may have situations in which a drivers/staging issue is relevant to their own customer base. (CVE-2021-28660)
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 5.11.11. 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)
An issue was discovered in the Linux kernel before 5.11.3 when a webcam device exists. video_usercopy in drivers/media/v4l2-core/v4l2-ioctl.c has a memory leak for large arguments, aka CID-fb18802a338b.
(CVE-2021-30002)
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%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-4945-1. 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(149416);
script_version("1.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");
script_cve_id(
"CVE-2020-25639",
"CVE-2021-28038",
"CVE-2021-28375",
"CVE-2021-28660",
"CVE-2021-29265",
"CVE-2021-29650",
"CVE-2021-30002"
);
script_xref(name:"USN", value:"4945-1");
script_name(english:"Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4945-1)");
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 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-4945-1 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 through 5.11.3, as used with Xen PV. A certain part of the
netback driver lacks necessary treatment of errors such as failed memory allocations (as a result of
changes to the handling of grant mapping errors). A host OS denial of service may occur during misbehavior
of a networking frontend driver. NOTE: this issue exists because of an incomplete fix for CVE-2021-26931.
(CVE-2021-28038)
- 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)
- rtw_wx_set_scan in drivers/staging/rtl8188eu/os_dep/ioctl_linux.c in the Linux kernel through 5.11.6
allows writing beyond the end of the ->ssid[] array. NOTE: from the perspective of kernel.org releases,
CVE IDs are not normally used for drivers/staging/* (unfinished work); however, system integrators may
have situations in which a drivers/staging issue is relevant to their own customer base. (CVE-2021-28660)
- 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 5.11.11. 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)
- An issue was discovered in the Linux kernel before 5.11.3 when a webcam device exists. video_usercopy in
drivers/media/v4l2-core/v4l2-ioctl.c has a memory leak for large arguments, aka CID-fb18802a338b.
(CVE-2021-30002)
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-4945-1");
script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
script_set_cvss_base_vector("CVSS2#AV:A/AC:L/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:A/AC:L/PR:N/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-2021-28660");
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:"2021/03/04");
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:18.04:-:lts");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1015-gkeop");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1039-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1043-gcp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1044-oracle");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1045-oracle");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1047-azure");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1048-aws");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-73-generic");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-73-generic-lpae");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-73-lowlatency");
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) 2021-2024 Canonical, Inc. / NASL script (C) 2021-2024 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 (! ('18.04' >< os_release || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 18.04 / 20.04', '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 = {
'18.04': {
'5.4.0': {
'generic': '5.4.0-73',
'generic-lpae': '5.4.0-73',
'lowlatency': '5.4.0-73',
'gkeop': '5.4.0-1015',
'gcp': '5.4.0-1043',
'oracle': '5.4.0-1044',
'azure': '5.4.0-1047',
'aws': '5.4.0-1048'
}
},
'20.04': {
'5.4.0': {
'generic': '5.4.0-73',
'generic-lpae': '5.4.0-73',
'lowlatency': '5.4.0-73',
'gkeop': '5.4.0-1015',
'kvm': '5.4.0-1039',
'gcp': '5.4.0-1043',
'oracle': '5.4.0-1045',
'azure': '5.4.0-1047',
'aws': '5.4.0-1048'
}
}
};
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-4945-1');
}
if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
var cve_list = make_list('CVE-2020-25639', 'CVE-2021-28038', 'CVE-2021-28375', 'CVE-2021-28660', 'CVE-2021-29265', 'CVE-2021-29650', 'CVE-2021-30002');
if (ksplice_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4945-1');
}
else
{
extra = extra + ksplice_reporting_text();
}
}
if (extra) {
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : extra
);
exit(0);
}
Vendor | Product | Version | CPE |
---|---|---|---|
canonical | ubuntu_linux | 18.04 | cpe:/o:canonical:ubuntu_linux:18.04:-:lts |
canonical | ubuntu_linux | 20.04 | cpe:/o:canonical:ubuntu_linux:20.04:-:lts |
canonical | ubuntu_linux | linux-image-5.4.0-1015-gkeop | p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1015-gkeop |
canonical | ubuntu_linux | linux-image-5.4.0-1039-kvm | p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1039-kvm |
canonical | ubuntu_linux | linux-image-5.4.0-1043-gcp | p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1043-gcp |
canonical | ubuntu_linux | linux-image-5.4.0-1044-oracle | p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1044-oracle |
canonical | ubuntu_linux | linux-image-5.4.0-1045-oracle | p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1045-oracle |
canonical | ubuntu_linux | linux-image-5.4.0-1047-azure | p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1047-azure |
canonical | ubuntu_linux | linux-image-5.4.0-1048-aws | p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1048-aws |
canonical | ubuntu_linux | linux-image-5.4.0-73-generic | p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-73-generic |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25639
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28038
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28375
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28660
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29265
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29650
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30002
ubuntu.com/security/notices/USN-4945-1