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 High
AI Score
Confidence
Low
0.05 Low
EPSS
Percentile
92.9%
The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:3741 advisory.
The DNS message parsing code in named
includes a section whose computational complexity is overly high.
It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected named
instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1. (CVE-2023-4408)
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the KeyTrap issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records. (CVE-2023-50387)
The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the NSEC3 issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations. (CVE-2023-50868)
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 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2024:3741.
##
include('compat.inc');
if (description)
{
script_id(200727);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/19");
script_cve_id("CVE-2023-4408", "CVE-2023-50387", "CVE-2023-50868");
script_xref(name:"IAVA", value:"2024-A-0103");
script_xref(name:"RHSA", value:"2024:3741");
script_name(english:"CentOS 7 : bind, bind-dyndb-ldap, and dhcp (RHSA-2024:3741)");
script_set_attribute(attribute:"synopsis", value:
"The remote CentOS Linux host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the
RHSA-2024:3741 advisory.
- The DNS message parsing code in `named` includes a section whose computational complexity is overly high.
It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive
CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative
servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through
9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1
through 9.18.21-S1. (CVE-2023-4408)
- Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote
attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the
KeyTrap issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the
protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG
records. (CVE-2023-50387)
- The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped)
allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC
responses in a random subdomain attack, aka the NSEC3 issue. The RFC 5155 specification implies that an
algorithm must perform thousands of iterations of a hash function in certain situations. (CVE-2023-50868)
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/errata/RHSA-2024:3741");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
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-2023-50387");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vendor_severity", value:"Important");
script_set_attribute(attribute:"vuln_publication_date", value:"2024/02/13");
script_set_attribute(attribute:"patch_publication_date", value:"2024/06/10");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/06/19");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-chroot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-dyndb-ldap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-export-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-export-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-libs-lite");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-license");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-lite-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-pkcs11");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-pkcs11-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-pkcs11-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-pkcs11-utils");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-sdb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-sdb-chroot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bind-utils");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhclient");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhcp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhcp-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhcp-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhcp-libs");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
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:"CentOS Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release');
if (isnull(os_release) || 'CentOS' >!< os_release) audit(AUDIT_OS_NOT, 'CentOS');
var os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '7')) audit(AUDIT_OS_NOT, 'CentOS 7.x', 'CentOS ' + os_ver);
if (!get_kb_item('Host/CentOS/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, 'CentOS', cpu);
var pkgs = [
{'reference':'bind-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-chroot-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-chroot-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-devel-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-devel-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-dyndb-ldap-11.1-7.el7_9.1', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'bind-dyndb-ldap-11.1-7.el7_9.1', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'bind-export-devel-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-export-devel-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-export-libs-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-export-libs-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-libs-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-libs-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-libs-lite-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-libs-lite-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-license-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-license-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-lite-devel-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-lite-devel-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-pkcs11-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-pkcs11-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-pkcs11-devel-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-pkcs11-devel-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-pkcs11-libs-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-pkcs11-libs-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-pkcs11-utils-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-pkcs11-utils-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-sdb-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-sdb-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-sdb-chroot-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-sdb-chroot-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-utils-9.11.4-26.P2.el7_9.16', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind-utils-9.11.4-26.P2.el7_9.16', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'dhclient-4.2.5-83.el7_9.2', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhclient-4.2.5-83.el7_9.2', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhcp-4.2.5-83.el7_9.2', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhcp-4.2.5-83.el7_9.2', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhcp-common-4.2.5-83.el7_9.2', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhcp-common-4.2.5-83.el7_9.2', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhcp-devel-4.2.5-83.el7_9.2', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhcp-devel-4.2.5-83.el7_9.2', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhcp-libs-4.2.5-83.el7_9.2', 'cpu':'ppc64le', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'},
{'reference':'dhcp-libs-4.2.5-83.el7_9.2', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'12'}
];
var flag = 0;
foreach var package_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;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) _release = package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (reference && _release) {
if (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)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'bind / bind-chroot / bind-devel / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
centos | centos | bind-pkcs11-utils | p-cpe:/a:centos:centos:bind-pkcs11-utils |
centos | centos | bind-pkcs11-devel | p-cpe:/a:centos:centos:bind-pkcs11-devel |
centos | centos | bind-sdb-chroot | p-cpe:/a:centos:centos:bind-sdb-chroot |
centos | centos | dhcp-libs | p-cpe:/a:centos:centos:dhcp-libs |
centos | centos | bind-devel | p-cpe:/a:centos:centos:bind-devel |
centos | centos | bind-sdb | p-cpe:/a:centos:centos:bind-sdb |
centos | centos | bind-dyndb-ldap | p-cpe:/a:centos:centos:bind-dyndb-ldap |
centos | centos | bind-chroot | p-cpe:/a:centos:centos:bind-chroot |
centos | centos | bind-export-libs | p-cpe:/a:centos:centos:bind-export-libs |
centos | centos | bind-libs | p-cpe:/a:centos:centos:bind-libs |
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 High
AI Score
Confidence
Low
0.05 Low
EPSS
Percentile
92.9%