The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:2718 advisory.
kernel: perf_event_parse_addr_filter memory (CVE-2020-25704)
kernel: security bypass in certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541)
kernel: fork: fix copy_process(CLONE_PARENT) race with the exiting ->real_parent (CVE-2020-35508)
kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
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, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2021:2718. The text
# itself is copyright (C) Red Hat, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(151857);
script_version("1.11");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/05/24");
script_cve_id(
"CVE-2020-25704",
"CVE-2020-26541",
"CVE-2020-35508",
"CVE-2021-33034",
"CVE-2021-33909"
);
script_xref(name:"RHSA", value:"2021:2718");
script_xref(name:"IAVA", value:"2021-A-0350");
script_name(english:"RHEL 8 : kernel (RHSA-2021:2718)");
script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2021:2718 advisory.
- kernel: perf_event_parse_addr_filter memory (CVE-2020-25704)
- kernel: security bypass in certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541)
- kernel: fork: fix copy_process(CLONE_PARENT) race with the exiting ->real_parent (CVE-2020-35508)
- kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
- kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
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://access.redhat.com/security/cve/CVE-2020-25704");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-26541");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-35508");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2021-33034");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2021-33909");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:2718");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1886285");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1895961");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1902724");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1961305");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1970273");
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:H/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:H/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-33909");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_cwe_id(200, 347, 400, 401, 416, 665, 787);
script_set_attribute(attribute:"vuln_publication_date", value:"2020/10/02");
script_set_attribute(attribute:"patch_publication_date", value:"2021/07/20");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/07/21");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_aus:8.2");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_e4s:8.2");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:8.2");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_tus:8.2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bpftool");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-abi-whitelists");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-core");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-cross-headers");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-core");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-modules-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-modules-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump-core");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump-modules-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:perf");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python3-perf");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"II");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Red Hat Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl", "linux_alt_patch_detect.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
exit(0);
}
include('rpm.inc');
include('rhel.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/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'eq', os_version: os_ver, rhel_version: '8.2')) audit(AUDIT_OS_NOT, 'Red Hat 8.2', 'Red Hat ' + os_ver);
if (!get_kb_item('Host/RedHat/rpm-list')) 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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);
if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
rm_kb_item(name:'Host/uptrack-uname-r');
var cve_list = make_list('CVE-2020-25704', 'CVE-2020-26541', 'CVE-2020-35508', 'CVE-2021-33034', 'CVE-2021-33909');
if (ksplice_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for RHSA-2021:2718');
}
else
{
__rpm_report = ksplice_reporting_text();
}
}
var constraints = [
{
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'content/aus/rhel8/8.2/x86_64/appstream/os',
'content/aus/rhel8/8.2/x86_64/appstream/source/SRPMS',
'content/aus/rhel8/8.2/x86_64/baseos/debug',
'content/aus/rhel8/8.2/x86_64/baseos/os',
'content/aus/rhel8/8.2/x86_64/baseos/source/SRPMS',
'content/e4s/rhel8/8.2/ppc64le/appstream/debug',
'content/e4s/rhel8/8.2/ppc64le/appstream/os',
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'content/e4s/rhel8/8.2/ppc64le/baseos/debug',
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'content/e4s/rhel8/8.2/ppc64le/baseos/source/SRPMS',
'content/e4s/rhel8/8.2/ppc64le/highavailability/debug',
'content/e4s/rhel8/8.2/ppc64le/highavailability/os',
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],
'pkgs': [
{'reference':'bpftool-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-abi-whitelists-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-core-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-cross-headers-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-core-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-devel-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-modules-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-modules-extra-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-devel-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
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{'reference':'kernel-tools-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-devel-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-devel-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-devel-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-zfcpdump-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'s390x', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-zfcpdump-core-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'s390x', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-zfcpdump-devel-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'s390x', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-zfcpdump-modules-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'s390x', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-zfcpdump-modules-extra-4.18.0-193.60.2.el8_2', 'sp':'2', 'cpu':'s390x', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'perf-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-perf-4.18.0-193.60.2.el8_2', 'sp':'2', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
]
}
];
var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);
var flag = 0;
foreach var constraint_array ( constraints ) {
var repo_relative_urls = NULL;
if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
foreach var pkg ( constraint_array['pkgs'] ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = NULL;
if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
if (reference &&
_release &&
rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
(applicable_repo_urls || (!exists_check || rpm_exists(release:_release, rpm:exists_check))) &&
rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
}
}
if (flag)
{
var subscription_caveat = '\n' +
'NOTE: This vulnerability check contains fixes that apply to\n' +
'packages only available in the Red Hat Enterprise Linux\n' +
'Advanced Update Support, Extended Update Support, Telco Extended Update Support or Update Services for SAP Solutions repositories.\n' +
'Access to these repositories requires a paid RHEL subscription.\n';
var extra = NULL;
if (empty_or_null(applicable_repo_urls)) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
else extra = subscription_caveat + rpm_report_get() + redhat_report_package_caveat();
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : extra
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'bpftool / kernel / kernel-abi-whitelists / kernel-core / etc');
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25704
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26541
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35508
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33034
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33909
access.redhat.com/errata/RHSA-2021:2718
access.redhat.com/security/cve/CVE-2020-25704
access.redhat.com/security/cve/CVE-2020-26541
access.redhat.com/security/cve/CVE-2020-35508
access.redhat.com/security/cve/CVE-2021-33034
access.redhat.com/security/cve/CVE-2021-33909
bugzilla.redhat.com/1886285
bugzilla.redhat.com/1895961
bugzilla.redhat.com/1902724
bugzilla.redhat.com/1961305
bugzilla.redhat.com/1970273