5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.3 High
AI Score
Confidence
High
0.02 Low
EPSS
Percentile
88.8%
The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:4181 advisory.
The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.
Security Fix(es):
* unbound: amplification of an incoming query into a large number of queries directed to a target (CVE-2020-12662)
* unbound: infinite loop via malformed DNS answers received from upstream servers (CVE-2020-12663)
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.
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-2020:4181. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(141196);
script_version("1.10");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/04");
script_cve_id("CVE-2020-12662", "CVE-2020-12663");
script_xref(name:"RHSA", value:"2020:4181");
script_name(english:"RHEL 7 : unbound (RHSA-2020:4181)");
script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for unbound.");
script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2020:4181 advisory.
The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.
Security Fix(es):
* unbound: amplification of an incoming query into a large number of queries directed to a target
(CVE-2020-12662)
* unbound: infinite loop via malformed DNS answers received from upstream servers (CVE-2020-12663)
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.
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/2020/rhsa-2020_4181.json
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c32a3345");
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-2020:4181");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1837597");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1837604");
script_set_attribute(attribute:"solution", value:
"Update the RHEL unbound package based on the guidance in RHSA-2020:4181.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-12663");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_cwe_id(400, 835);
script_set_attribute(attribute:"vendor_severity", value:"Important");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/19");
script_set_attribute(attribute:"patch_publication_date", value:"2020/10/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/06");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:7.7");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-python");
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) 2020-2024 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: 'eq', os_version: os_ver, rhel_version: '7.7')) audit(AUDIT_OS_NOT, 'Red Hat 7.7', '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/aus/rhel/server/7/7.7/x86_64/debug',
'content/aus/rhel/server/7/7.7/x86_64/optional/debug',
'content/aus/rhel/server/7/7.7/x86_64/optional/os',
'content/aus/rhel/server/7/7.7/x86_64/optional/source/SRPMS',
'content/aus/rhel/server/7/7.7/x86_64/os',
'content/aus/rhel/server/7/7.7/x86_64/source/SRPMS',
'content/e4s/rhel/power-le/7/7.7/ppc64le/debug',
'content/e4s/rhel/power-le/7/7.7/ppc64le/highavailability/debug',
'content/e4s/rhel/power-le/7/7.7/ppc64le/highavailability/os',
'content/e4s/rhel/power-le/7/7.7/ppc64le/highavailability/source/SRPMS',
'content/e4s/rhel/power-le/7/7.7/ppc64le/optional/debug',
'content/e4s/rhel/power-le/7/7.7/ppc64le/optional/os',
'content/e4s/rhel/power-le/7/7.7/ppc64le/optional/source/SRPMS',
'content/e4s/rhel/power-le/7/7.7/ppc64le/os',
'content/e4s/rhel/power-le/7/7.7/ppc64le/source/SRPMS',
'content/e4s/rhel/server/7/7.7/x86_64/debug',
'content/e4s/rhel/server/7/7.7/x86_64/highavailability/debug',
'content/e4s/rhel/server/7/7.7/x86_64/highavailability/os',
'content/e4s/rhel/server/7/7.7/x86_64/highavailability/source/SRPMS',
'content/e4s/rhel/server/7/7.7/x86_64/optional/debug',
'content/e4s/rhel/server/7/7.7/x86_64/optional/os',
'content/e4s/rhel/server/7/7.7/x86_64/optional/source/SRPMS',
'content/e4s/rhel/server/7/7.7/x86_64/os',
'content/e4s/rhel/server/7/7.7/x86_64/source/SRPMS',
'content/eus/rhel/computenode/7/7.7/x86_64/debug',
'content/eus/rhel/computenode/7/7.7/x86_64/optional/debug',
'content/eus/rhel/computenode/7/7.7/x86_64/optional/os',
'content/eus/rhel/computenode/7/7.7/x86_64/optional/source/SRPMS',
'content/eus/rhel/computenode/7/7.7/x86_64/os',
'content/eus/rhel/computenode/7/7.7/x86_64/source/SRPMS',
'content/eus/rhel/power-le/7/7.7/ppc64le/debug',
'content/eus/rhel/power-le/7/7.7/ppc64le/highavailability/debug',
'content/eus/rhel/power-le/7/7.7/ppc64le/highavailability/os',
'content/eus/rhel/power-le/7/7.7/ppc64le/highavailability/source/SRPMS',
'content/eus/rhel/power-le/7/7.7/ppc64le/optional/debug',
'content/eus/rhel/power-le/7/7.7/ppc64le/optional/os',
'content/eus/rhel/power-le/7/7.7/ppc64le/optional/source/SRPMS',
'content/eus/rhel/power-le/7/7.7/ppc64le/os',
'content/eus/rhel/power-le/7/7.7/ppc64le/resilientstorage/debug',
'content/eus/rhel/power-le/7/7.7/ppc64le/resilientstorage/os',
'content/eus/rhel/power-le/7/7.7/ppc64le/resilientstorage/source/SRPMS',
'content/eus/rhel/power-le/7/7.7/ppc64le/source/SRPMS',
'content/eus/rhel/power/7/7.7/ppc64/debug',
'content/eus/rhel/power/7/7.7/ppc64/optional/debug',
'content/eus/rhel/power/7/7.7/ppc64/optional/os',
'content/eus/rhel/power/7/7.7/ppc64/optional/source/SRPMS',
'content/eus/rhel/power/7/7.7/ppc64/os',
'content/eus/rhel/power/7/7.7/ppc64/source/SRPMS',
'content/eus/rhel/server/7/7.7/x86_64/debug',
'content/eus/rhel/server/7/7.7/x86_64/highavailability/debug',
'content/eus/rhel/server/7/7.7/x86_64/highavailability/os',
'content/eus/rhel/server/7/7.7/x86_64/highavailability/source/SRPMS',
'content/eus/rhel/server/7/7.7/x86_64/optional/debug',
'content/eus/rhel/server/7/7.7/x86_64/optional/os',
'content/eus/rhel/server/7/7.7/x86_64/optional/source/SRPMS',
'content/eus/rhel/server/7/7.7/x86_64/os',
'content/eus/rhel/server/7/7.7/x86_64/resilientstorage/debug',
'content/eus/rhel/server/7/7.7/x86_64/resilientstorage/os',
'content/eus/rhel/server/7/7.7/x86_64/resilientstorage/source/SRPMS',
'content/eus/rhel/server/7/7.7/x86_64/source/SRPMS',
'content/eus/rhel/system-z/7/7.7/s390x/debug',
'content/eus/rhel/system-z/7/7.7/s390x/optional/debug',
'content/eus/rhel/system-z/7/7.7/s390x/optional/os',
'content/eus/rhel/system-z/7/7.7/s390x/optional/source/SRPMS',
'content/eus/rhel/system-z/7/7.7/s390x/os',
'content/eus/rhel/system-z/7/7.7/s390x/source/SRPMS',
'content/tus/rhel/server/7/7.7/x86_64/debug',
'content/tus/rhel/server/7/7.7/x86_64/highavailability/debug',
'content/tus/rhel/server/7/7.7/x86_64/highavailability/os',
'content/tus/rhel/server/7/7.7/x86_64/highavailability/source/SRPMS',
'content/tus/rhel/server/7/7.7/x86_64/optional/debug',
'content/tus/rhel/server/7/7.7/x86_64/optional/os',
'content/tus/rhel/server/7/7.7/x86_64/optional/source/SRPMS',
'content/tus/rhel/server/7/7.7/x86_64/os',
'content/tus/rhel/server/7/7.7/x86_64/source/SRPMS'
],
'pkgs': [
{'reference':'unbound-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-1.6.6-2.el7_7', 'sp':'7', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-1.6.6-2.el7_7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-devel-1.6.6-2.el7_7', 'sp':'7', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-devel-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-devel-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-devel-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-devel-1.6.6-2.el7_7', 'sp':'7', 'cpu':'s390', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-devel-1.6.6-2.el7_7', 'sp':'7', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-devel-1.6.6-2.el7_7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-libs-1.6.6-2.el7_7', 'sp':'7', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-libs-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-libs-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-libs-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-libs-1.6.6-2.el7_7', 'sp':'7', 'cpu':'s390', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-libs-1.6.6-2.el7_7', 'sp':'7', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-libs-1.6.6-2.el7_7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-python-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-python-1.6.6-2.el7_7', 'sp':'7', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-python-1.6.6-2.el7_7', 'sp':'7', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'unbound-python-1.6.6-2.el7_7', 'sp':'7', 'cpu':'x86_64', 'release':'7', '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 subscription_caveat = '\n' +
'NOTE: This vulnerability check contains fixes that apply to\n' +
'packages only available in the Red Hat Enterprise Linux\n' +
'Extended Update Support repository.\n' +
'Access to this repository requires a paid RHEL subscription.\n';
var extra = NULL;
if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
else extra = subscription_caveat + rpm_report_get();
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : extra
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'unbound / unbound-devel / unbound-libs / unbound-python');
}
Vendor | Product | Version | CPE |
---|---|---|---|
redhat | enterprise_linux | unbound-libs | p-cpe:/a:redhat:enterprise_linux:unbound-libs |
redhat | enterprise_linux | unbound-python | p-cpe:/a:redhat:enterprise_linux:unbound-python |
redhat | rhel_eus | 7.7 | cpe:/o:redhat:rhel_eus:7.7 |
redhat | enterprise_linux | unbound-devel | p-cpe:/a:redhat:enterprise_linux:unbound-devel |
redhat | enterprise_linux | unbound | p-cpe:/a:redhat:enterprise_linux:unbound |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12662
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12663
www.nessus.org/u?c32a3345
access.redhat.com/errata/RHSA-2020:4181
access.redhat.com/security/updates/classification/#important
bugzilla.redhat.com/show_bug.cgi?id=1837597
bugzilla.redhat.com/show_bug.cgi?id=1837604
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.3 High
AI Score
Confidence
High
0.02 Low
EPSS
Percentile
88.8%