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 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:0395 advisory.
The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks.
Security Fix(es):
* sudo: Heap buffer overflow in argument parsing (CVE-2021-3156)
* 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)
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* When performing an upgrade of the Red Hat Virtualization Host using the command `yum update`, the yum repository for RHV 4.3 EUS is unreachable
As a workaround, run the following command:
`# yum update --releasever=7Server` (BZ#1899378)
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-2021:0395. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(146093);
script_version("1.18");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/03");
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:"2021:0395");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/04/27");
script_xref(name:"CEA-ID", value:"CEA-2021-0003");
script_name(english:"RHEL 7 : RHV-H security, update (redhat-virtualization-host) 4.3.13 (Important) (RHSA-2021:0395)");
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 7 host has a package installed that is affected by multiple vulnerabilities as
referenced in the RHSA-2021:0395 advisory.
The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include
redhat-release-virtualization-host. Red Hat Virtualization Hosts (RHVH) are installed using a special
build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features
a Cockpit user interface for monitoring the host's resources and performing administrative tasks.
Security Fix(es):
* sudo: Heap buffer overflow in argument parsing (CVE-2021-3156)
* 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)
For more details about the security issue(s), including the impact, a CVSS score, and other related
information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* When performing an upgrade of the Red Hat Virtualization Host using the command `yum update`, the yum
repository for RHV 4.3 EUS is unreachable
As a workaround, run the following command:
`# yum update --releasever=7Server` (BZ#1899378)
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_0395.json
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7f361535");
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/security/vulnerabilities/RHSB-2021-001");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/vulnerabilities/RHSB-2021-002");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:0395");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1889686");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1889688");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1890125");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1899378");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1916111");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=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:"vendor_severity", value:"Important");
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:7");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:redhat-virtualization-host");
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: '7')) audit(AUDIT_OS_NOT, 'Red Hat 7.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/rhel-alt/server/7/7Server/power9/ppc64le/rhv-mgmt-agent/4/debug',
'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/rhv-mgmt-agent/4/os',
'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/rhv-mgmt-agent/4/source/SRPMS',
'content/dist/rhel/power-le/7/7.3/ppc64le/rhev-mgmt-agent/3/debug',
'content/dist/rhel/power-le/7/7.3/ppc64le/rhev-mgmt-agent/3/os',
'content/dist/rhel/power-le/7/7.3/ppc64le/rhev-mgmt-agent/3/source/SRPMS',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhev-mgmt-agent/3/debug',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhev-mgmt-agent/3/os',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhev-mgmt-agent/3/source/SRPMS',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhev-tools/3/debug',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhev-tools/3/os',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhev-tools/3/source/SRPMS',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhv-mgmt-agent/4/debug',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhv-mgmt-agent/4/os',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhv-mgmt-agent/4/source/SRPMS',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhv-tools/4/debug',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhv-tools/4/os',
'content/dist/rhel/power-le/7/7Server/ppc64le/rhv-tools/4/source/SRPMS',
'content/dist/rhel/power/7/7Server/ppc64/rhev-tools/3/debug',
'content/dist/rhel/power/7/7Server/ppc64/rhev-tools/3/os',
'content/dist/rhel/power/7/7Server/ppc64/rhev-tools/3/source/SRPMS',
'content/dist/rhel/server/7/7.3/x86_64/rhev-mgmt-agent/3/debug',
'content/dist/rhel/server/7/7.3/x86_64/rhev-mgmt-agent/3/os',
'content/dist/rhel/server/7/7.3/x86_64/rhev-mgmt-agent/3/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhev-mgmt-agent/3/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhev-mgmt-agent/3/os',
'content/dist/rhel/server/7/7Server/x86_64/rhev-mgmt-agent/3/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhevh/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhevh/os',
'content/dist/rhel/server/7/7Server/x86_64/rhevh/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhv-manager-tools/4/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhv-manager-tools/4/os',
'content/dist/rhel/server/7/7Server/x86_64/rhv-manager-tools/4/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhv-mgmt-agent/4.3/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhv-mgmt-agent/4.3/os',
'content/dist/rhel/server/7/7Server/x86_64/rhv-mgmt-agent/4.3/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhv-mgmt-agent/4/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhv-mgmt-agent/4/os',
'content/dist/rhel/server/7/7Server/x86_64/rhv-mgmt-agent/4/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhv-tools/4/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhv-tools/4/os',
'content/dist/rhel/server/7/7Server/x86_64/rhv-tools/4/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhvh-build/4.3/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhvh-build/4.3/os',
'content/dist/rhel/server/7/7Server/x86_64/rhvh-build/4.3/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhvh-build/4/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhvh-build/4/os',
'content/dist/rhel/server/7/7Server/x86_64/rhvh-build/4/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhvh/4.3/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhvh/4.3/os',
'content/dist/rhel/server/7/7Server/x86_64/rhvh/4.3/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/rhvh/4/debug',
'content/dist/rhel/server/7/7Server/x86_64/rhvh/4/os',
'content/dist/rhel/server/7/7Server/x86_64/rhvh/4/source/SRPMS'
],
'pkgs': [
{'reference':'redhat-virtualization-host-image-update-4.3.13-20210127.0.el7_9', 'release':'7', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ovirt-'}
]
}
];
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, '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
www.nessus.org/u?7f361535
access.redhat.com/errata/RHSA-2021:0395
access.redhat.com/security/updates/classification/#important
access.redhat.com/security/vulnerabilities/RHSB-2021-001
access.redhat.com/security/vulnerabilities/RHSB-2021-002
bugzilla.redhat.com/show_bug.cgi?id=1889686
bugzilla.redhat.com/show_bug.cgi?id=1889688
bugzilla.redhat.com/show_bug.cgi?id=1890125
bugzilla.redhat.com/show_bug.cgi?id=1899378
bugzilla.redhat.com/show_bug.cgi?id=1916111
bugzilla.redhat.com/show_bug.cgi?id=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%