The version of dhcp installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2021-25217 advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(172900);
script_version("1.2");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/08/29");
script_cve_id("CVE-2021-25217");
script_name(english:"CBL Mariner 2.0 Security Update: dhcp (CVE-2021-25217)");
script_set_attribute(attribute:"synopsis", value:
"The remote CBL Mariner host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The version of dhcp installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected
by a vulnerability as referenced in the CVE-2021-25217 advisory.
- In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases
in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no
longer supported by ISC. From inspection it is clear that the defect is also present in releases from
those series, but they have not been officially tested for the vulnerability), The outcome of encountering
the defect while reading a lease that will trigger it varies, according to: the component being affected
(i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler
flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced
the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when
reading an improper lease, which could cause network connectivity problems for an affected system due to
the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd
server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to
the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in
lack of service to clients. Additionally, the offending lease and the lease immediately following it in
the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit
architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not
occur, but it is possible for the offending lease and the lease which immediately followed it to be
improperly deleted. (CVE-2021-25217)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2021-25217");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-25217");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/05/26");
script_set_attribute(attribute:"patch_publication_date", value:"2021/06/08");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/03/20");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:cbl-mariner:dhcp-client");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:cbl-mariner:dhcp-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:cbl-mariner:dhcp-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:cbl-mariner:dhcp-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:cbl-mariner:dhcp-server");
script_set_attribute(attribute:"cpe", value:"x-cpe:/o:microsoft:cbl-mariner");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"MarinerOS Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/CBLMariner/release", "Host/CBLMariner/rpm-list", "Host/cpu");
exit(0);
}
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/CBLMariner/release');
if (isnull(release) || 'CBL-Mariner' >!< release) audit(AUDIT_OS_NOT, 'CBL-Mariner');
var os_ver = pregmatch(pattern: "CBL-Mariner ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'CBL-Mariner');
os_ver = os_ver[1];
if (! preg(pattern:"^2([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'CBL-Mariner 2.0', 'CBL-Mariner ' + os_ver);
if (!get_kb_item('Host/CBLMariner/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu)
audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CBL-Mariner', cpu);
var pkgs = [
{'reference':'dhcp-client-4.4.2-4.cm2', 'cpu':'x86_64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-client-4.4.2-4.cm2', 'cpu':'aarch64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-debuginfo-4.4.2-4.cm2', 'cpu':'x86_64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-debuginfo-4.4.2-4.cm2', 'cpu':'aarch64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-devel-4.4.2-4.cm2', 'cpu':'x86_64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-devel-4.4.2-4.cm2', 'cpu':'aarch64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-libs-4.4.2-4.cm2', 'cpu':'x86_64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-libs-4.4.2-4.cm2', 'cpu':'aarch64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-server-4.4.2-4.cm2', 'cpu':'x86_64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE},
{'reference':'dhcp-server-4.4.2-4.cm2', 'cpu':'aarch64', 'release':'2.0', 'rpm_spec_vers_cmp':TRUE}
];
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;
var exists_check = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) _release = 'CBLMariner-' + 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 (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
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_NOTE,
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, 'dhcp-client / dhcp-debuginfo / dhcp-devel / dhcp-libs / dhcp-server');
}
Vendor | Product | Version | CPE |
---|---|---|---|
microsoft | cbl-mariner | dhcp-client | p-cpe:/a:microsoft:cbl-mariner:dhcp-client |
microsoft | cbl-mariner | dhcp-debuginfo | p-cpe:/a:microsoft:cbl-mariner:dhcp-debuginfo |
microsoft | cbl-mariner | dhcp-devel | p-cpe:/a:microsoft:cbl-mariner:dhcp-devel |
microsoft | cbl-mariner | dhcp-libs | p-cpe:/a:microsoft:cbl-mariner:dhcp-libs |
microsoft | cbl-mariner | dhcp-server | p-cpe:/a:microsoft:cbl-mariner:dhcp-server |
microsoft | cbl-mariner | x-cpe:/o:microsoft:cbl-mariner |