The version of kernel installed on the remote host is prior to 4.14.268-139.500. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2022-1571 advisory.
The BPF subsystem in the Linux kernel before 4.17 mishandles situations with a long jump over an instruction sequence where inner instructions require substantial expansions into multiple BPF instructions, leading to an overflow. This affects kernel/bpf/core.c and net/core/filter.c.
(CVE-2018-25020)
An issue was discovered in the FUSE filesystem implementation in the Linux kernel before 5.10.6, aka CID-5d069dbe8aaf. fuse_do_getattr() calls make_bad_inode() in inappropriate situations, causing a system crash. NOTE: the original fix for this vulnerability was incomplete, and its incompleteness is tracked as CVE-2021-28950. (CVE-2020-36322)
fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arranging for those servers to be unreachable during trunking detection. (CVE-2021-38199)
A flaw null pointer dereference in the Linux kernel UDF file system functionality was found in the way user triggers udf_file_write_iter function for the malicious UDF image. A local user could use this flaw to crash the system. Actual from Linux kernel 4.2-rc1 till 5.17-rc2. (CVE-2022-0617)
An issue was discovered in fs/nfs/dir.c in the Linux kernel before 5.16.5. If an application sets the O_DIRECTORY flag, and tries to open a regular file, nfs_atomic_open() performs a regular lookup. If a regular file is found, ENOTDIR should occur, but the server instead returns uninitialized data in the file descriptor. (CVE-2022-24448)
Note that Nessus has not tested for this issue 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 Amazon Linux AMI Security Advisory ALAS-2022-1571.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(158697);
script_version("1.9");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/07/08");
script_cve_id(
"CVE-2018-25020",
"CVE-2020-36322",
"CVE-2021-4197",
"CVE-2021-26341",
"CVE-2021-26401",
"CVE-2021-38199",
"CVE-2022-0001",
"CVE-2022-0002",
"CVE-2022-0330",
"CVE-2022-0435",
"CVE-2022-0617",
"CVE-2022-23960",
"CVE-2022-24448"
);
script_xref(name:"ALAS", value:"2022-1571");
script_name(english:"Amazon Linux AMI : kernel (ALAS-2022-1571)");
script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux AMI host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The version of kernel installed on the remote host is prior to 4.14.268-139.500. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS-2022-1571 advisory.
- The BPF subsystem in the Linux kernel before 4.17 mishandles situations with a long jump over an
instruction sequence where inner instructions require substantial expansions into multiple BPF
instructions, leading to an overflow. This affects kernel/bpf/core.c and net/core/filter.c.
(CVE-2018-25020)
- An issue was discovered in the FUSE filesystem implementation in the Linux kernel before 5.10.6, aka
CID-5d069dbe8aaf. fuse_do_getattr() calls make_bad_inode() in inappropriate situations, causing a system
crash. NOTE: the original fix for this vulnerability was incomplete, and its incompleteness is tracked as
CVE-2021-28950. (CVE-2020-36322)
- fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which
allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arranging for
those servers to be unreachable during trunking detection. (CVE-2021-38199)
- A flaw null pointer dereference in the Linux kernel UDF file system functionality was found in the way
user triggers udf_file_write_iter function for the malicious UDF image. A local user could use this flaw
to crash the system. Actual from Linux kernel 4.2-rc1 till 5.17-rc2. (CVE-2022-0617)
- An issue was discovered in fs/nfs/dir.c in the Linux kernel before 5.16.5. If an application sets the
O_DIRECTORY flag, and tries to open a regular file, nfs_atomic_open() performs a regular lookup. If a
regular file is found, ENOTDIR should occur, but the server instead returns uninitialized data in the file
descriptor. (CVE-2022-24448)
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://alas.aws.amazon.com/ALAS-2022-1571.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2018-25020.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2020-36322.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-38199.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-4197.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-0001.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-0002.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-0330.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-0435.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-0617.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-24448.html");
script_set_attribute(attribute:"solution", value:
"Run 'yum update kernel' to update your system.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:N/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-2022-0435");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/14");
script_set_attribute(attribute:"patch_publication_date", value:"2022/03/07");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/03/08");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-headers");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf-debuginfo");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 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/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include('rpm.inc');
include('hotfixes.inc');
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
var os_ver = os_ver[1];
if (os_ver != "A")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
if (get_one_kb_item("Host/kpatch/kernel-cves"))
{
set_hotfix_type("kpatch");
var cve_list = make_list("CVE-2018-25020", "CVE-2020-36322", "CVE-2021-4197", "CVE-2021-38199", "CVE-2022-0001", "CVE-2022-0002", "CVE-2022-0330", "CVE-2022-0435", "CVE-2022-0617", "CVE-2022-24448");
if (hotfix_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, "kpatch hotfix for ALAS-2022-1571");
}
else
{
__rpm_report = hotfix_reporting_text();
}
}
var pkgs = [
{'reference':'kernel-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debuginfo-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debuginfo-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debuginfo-common-i686-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debuginfo-common-x86_64-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-devel-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-devel-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-headers-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-headers-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-debuginfo-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-debuginfo-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-devel-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-devel-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'perf-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'perf-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'perf-debuginfo-4.14.268-139.500.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
{'reference':'perf-debuginfo-4.14.268-139.500.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE}
];
var flag = 0;
foreach package_array ( pkgs ) {
var reference = NULL;
var release = NULL;
var cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var allowmaj = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) release = package_array['release'];
if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (reference && release) {
if (rpm_check(release:release, cpu:cpu, reference:reference, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) 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 / kernel-debuginfo / kernel-debuginfo-common-x86_64 / etc");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-25020
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36322
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26341
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26401
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38199
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4197
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0001
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0002
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0330
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0435
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0617
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23960
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24448
alas.aws.amazon.com/ALAS-2022-1571.html
alas.aws.amazon.com/cve/html/CVE-2018-25020.html
alas.aws.amazon.com/cve/html/CVE-2020-36322.html
alas.aws.amazon.com/cve/html/CVE-2021-38199.html
alas.aws.amazon.com/cve/html/CVE-2021-4197.html
alas.aws.amazon.com/cve/html/CVE-2022-0001.html
alas.aws.amazon.com/cve/html/CVE-2022-0002.html
alas.aws.amazon.com/cve/html/CVE-2022-0330.html
alas.aws.amazon.com/cve/html/CVE-2022-0435.html
alas.aws.amazon.com/cve/html/CVE-2022-0617.html
alas.aws.amazon.com/cve/html/CVE-2022-24448.html