CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
72.9%
The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:1081 advisory.
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)
* kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)
* kernel: Use after free via PI futex state (CVE-2021-3347)
* kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708)
* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)
* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)
* Kernel: KVM: host stack overflow due to lazy update IOAPIC (CVE-2020-27152)
* kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* kernel-rt possible livelock: WARNING: CPU: 28 PID: 3109 at kernel/ptrace.c:242 ptrace_check_attach+0xdd/0x1a0 (BZ#1925308)
* kernel-rt: update RT source tree to the RHEL-8.3.z3 source tree (BZ#1926369)
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2021:1081. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(148369);
script_version("1.10");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/04");
script_cve_id(
"CVE-2020-0466",
"CVE-2020-27152",
"CVE-2020-28374",
"CVE-2021-3347",
"CVE-2021-26708",
"CVE-2021-27363",
"CVE-2021-27364",
"CVE-2021-27365"
);
script_xref(name:"RHSA", value:"2021:1081");
script_name(english:"RHEL 8 : kernel-rt (RHSA-2021:1081)");
script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for kernel-rt.");
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-2021:1081 advisory.
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with
extremely high determinism requirements.
Security Fix(es):
* kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)
* kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)
* kernel: Use after free via PI futex state (CVE-2021-3347)
* kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708)
* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)
* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)
* Kernel: KVM: host stack overflow due to lazy update IOAPIC (CVE-2020-27152)
* kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* kernel-rt possible livelock: WARNING: CPU: 28 PID: 3109 at kernel/ptrace.c:242
ptrace_check_attach+0xdd/0x1a0 (BZ#1925308)
* kernel-rt: update RT source tree to the RHEL-8.3.z3 source tree (BZ#1926369)
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
# https://access.redhat.com/security/data/csaf/v2/advisories/2021/rhsa-2021_1081.json
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1d408589");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#important");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:1081");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1888886");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1899804");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1920480");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1922249");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1925588");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1926369");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1930078");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1930079");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1930080");
script_set_attribute(attribute:"solution", value:
"Update the RHEL kernel-rt package based on the guidance in RHSA-2021:1081.");
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:POC/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:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3347");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-28374");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_cwe_id(20, 122, 125, 200, 362, 416, 835);
script_set_attribute(attribute:"vendor_severity", value:"Important");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/11/06");
script_set_attribute(attribute:"patch_publication_date", value:"2021/04/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/07");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-core");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-core");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules-extra");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Red Hat Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2024 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: 'ge', os_version: os_ver, rhel_version: '8')) audit(AUDIT_OS_NOT, 'Red Hat 8.x', '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-2020-0466', 'CVE-2020-27152', 'CVE-2020-28374', 'CVE-2021-3347', 'CVE-2021-26708', 'CVE-2021-27363', 'CVE-2021-27364', 'CVE-2021-27365');
if (ksplice_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for RHSA-2021:1081');
}
else
{
__rpm_report = ksplice_reporting_text();
}
}
var constraints = [
{
'repo_relative_urls': [
'content/dist/rhel8/8.10/x86_64/nfv/debug',
'content/dist/rhel8/8.10/x86_64/nfv/os',
'content/dist/rhel8/8.10/x86_64/nfv/source/SRPMS',
'content/dist/rhel8/8.10/x86_64/rt/debug',
'content/dist/rhel8/8.10/x86_64/rt/os',
'content/dist/rhel8/8.10/x86_64/rt/source/SRPMS',
'content/dist/rhel8/8.6/x86_64/nfv/debug',
'content/dist/rhel8/8.6/x86_64/nfv/os',
'content/dist/rhel8/8.6/x86_64/nfv/source/SRPMS',
'content/dist/rhel8/8.6/x86_64/rt/debug',
'content/dist/rhel8/8.6/x86_64/rt/os',
'content/dist/rhel8/8.6/x86_64/rt/source/SRPMS',
'content/dist/rhel8/8.8/x86_64/nfv/debug',
'content/dist/rhel8/8.8/x86_64/nfv/os',
'content/dist/rhel8/8.8/x86_64/nfv/source/SRPMS',
'content/dist/rhel8/8.8/x86_64/rt/debug',
'content/dist/rhel8/8.8/x86_64/rt/os',
'content/dist/rhel8/8.8/x86_64/rt/source/SRPMS',
'content/dist/rhel8/8.9/x86_64/nfv/debug',
'content/dist/rhel8/8.9/x86_64/nfv/os',
'content/dist/rhel8/8.9/x86_64/nfv/source/SRPMS',
'content/dist/rhel8/8.9/x86_64/rt/debug',
'content/dist/rhel8/8.9/x86_64/rt/os',
'content/dist/rhel8/8.9/x86_64/rt/source/SRPMS',
'content/dist/rhel8/8/x86_64/nfv/debug',
'content/dist/rhel8/8/x86_64/nfv/os',
'content/dist/rhel8/8/x86_64/nfv/source/SRPMS',
'content/dist/rhel8/8/x86_64/rt/debug',
'content/dist/rhel8/8/x86_64/rt/os',
'content/dist/rhel8/8/x86_64/rt/source/SRPMS'
],
'pkgs': [
{'reference':'kernel-rt-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-debug-core-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-debug-devel-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-debug-kvm-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-debug-modules-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-debug-modules-extra-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-devel-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-kvm-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-modules-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-rt-modules-extra-4.18.0-240.22.1.rt7.77.el8_3', 'cpu':'x86_64', '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;
var cves = 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 (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
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, cves:cves)) flag++;
}
}
if (flag)
{
var extra = NULL;
if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
else extra = rpm_report_get();
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, 'kernel-rt / kernel-rt-core / kernel-rt-debug / kernel-rt-debug-core / etc');
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0466
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27152
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28374
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26708
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27363
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27364
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27365
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3347
www.nessus.org/u?1d408589
access.redhat.com/errata/RHSA-2021:1081
access.redhat.com/security/updates/classification/#important
bugzilla.redhat.com/show_bug.cgi?id=1888886
bugzilla.redhat.com/show_bug.cgi?id=1899804
bugzilla.redhat.com/show_bug.cgi?id=1920480
bugzilla.redhat.com/show_bug.cgi?id=1922249
bugzilla.redhat.com/show_bug.cgi?id=1925588
bugzilla.redhat.com/show_bug.cgi?id=1926369
bugzilla.redhat.com/show_bug.cgi?id=1930078
bugzilla.redhat.com/show_bug.cgi?id=1930079
bugzilla.redhat.com/show_bug.cgi?id=1930080
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
72.9%