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
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
Low
EPSS
Percentile
99.5%
The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:0401 advisory.
dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)
dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)
dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)
sudo: Heap buffer overflow in argument parsing (CVE-2021-3156)
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-2021:0401. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(146094);
script_version("1.17");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/24");
script_cve_id(
"CVE-2020-25684",
"CVE-2020-25685",
"CVE-2020-25686",
"CVE-2021-3156"
);
script_xref(name:"IAVA", value:"2021-A-0041");
script_xref(name:"IAVA", value:"2021-A-0053");
script_xref(name:"RHSA", value:"2021:0401");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/04/27");
script_xref(name:"CEA-ID", value:"CEA-2021-0003");
script_name(english:"RHEL 8 : Red Hat Virtualization Host security bug fix and enhancement update [ovirt-4.4.4] (Important) (RHSA-2021:0401)");
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 a package installed that is affected by multiple vulnerabilities as
referenced in the RHSA-2021:0401 advisory.
- dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker
(CVE-2020-25684)
- dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker
(CVE-2020-25685)
- dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path
attacker (CVE-2020-25686)
- sudo: Heap buffer overflow in argument parsing (CVE-2021-3156)
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-2020-25684");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-25685");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-25686");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2021-3156");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:0401");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1889686");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1889688");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1890125");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1917684");
script_set_attribute(attribute:"solution", value:
"Update the affected redhat-virtualization-host-image-update package.");
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-2021-3156");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploit_framework_core", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_set_attribute(attribute:"metasploit_name", value:'Sudo Heap-Based Buffer Overflow');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
script_set_attribute(attribute:"canvas_package", value:"CANVAS");
script_cwe_id(122, 290, 326, 358);
script_set_attribute(attribute:"vuln_publication_date", value:"2021/01/19");
script_set_attribute(attribute:"patch_publication_date", value:"2021/02/03");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/02/03");
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:redhat-virtualization-host-image-update");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"I");
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");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
exit(0);
}
include('rpm.inc');
include('rhel.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);
var constraints = [
{
'repo_relative_urls': [
'content/dist/layered/rhel8/ppc64le/rhv-mgmt-agent/4/debug',
'content/dist/layered/rhel8/ppc64le/rhv-mgmt-agent/4/os',
'content/dist/layered/rhel8/ppc64le/rhv-mgmt-agent/4/source/SRPMS',
'content/dist/layered/rhel8/ppc64le/rhv-tools/4/debug',
'content/dist/layered/rhel8/ppc64le/rhv-tools/4/os',
'content/dist/layered/rhel8/ppc64le/rhv-tools/4/source/SRPMS',
'content/dist/layered/rhel8/x86_64/rhv-mgmt-agent/4/debug',
'content/dist/layered/rhel8/x86_64/rhv-mgmt-agent/4/os',
'content/dist/layered/rhel8/x86_64/rhv-mgmt-agent/4/source/SRPMS',
'content/dist/layered/rhel8/x86_64/rhv-tools/4/debug',
'content/dist/layered/rhel8/x86_64/rhv-tools/4/os',
'content/dist/layered/rhel8/x86_64/rhv-tools/4/source/SRPMS',
'content/dist/layered/rhel8/x86_64/rhvh-build/4/debug',
'content/dist/layered/rhel8/x86_64/rhvh-build/4/os',
'content/dist/layered/rhel8/x86_64/rhvh-build/4/source/SRPMS',
'content/dist/layered/rhel8/x86_64/rhvh/4/debug',
'content/dist/layered/rhel8/x86_64/rhvh/4/os',
'content/dist/layered/rhel8/x86_64/rhvh/4/source/SRPMS'
],
'pkgs': [
{'reference':'redhat-virtualization-host-image-update-4.4.4-20210201.0.el8_3', 'release':'8', 'el_string':'el8_3', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'redhat-release-virtualization-host-4'}
]
}
];
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 extra = NULL;
if (empty_or_null(applicable_repo_urls)) extra = rpm_report_get() + redhat_report_repo_caveat();
else extra = 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, 'redhat-virtualization-host-image-update');
}
Vendor | Product | Version | CPE |
---|---|---|---|
redhat | enterprise_linux | 8 | cpe:/o:redhat:enterprise_linux:8 |
redhat | enterprise_linux | redhat-virtualization-host-image-update | p-cpe:/a:redhat:enterprise_linux:redhat-virtualization-host-image-update |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25684
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25685
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25686
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3156
access.redhat.com/errata/RHSA-2021:0401
access.redhat.com/security/cve/CVE-2020-25684
access.redhat.com/security/cve/CVE-2020-25685
access.redhat.com/security/cve/CVE-2020-25686
access.redhat.com/security/cve/CVE-2021-3156
bugzilla.redhat.com/1889686
bugzilla.redhat.com/1889688
bugzilla.redhat.com/1890125
bugzilla.redhat.com/1917684
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
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
Low
EPSS
Percentile
99.5%