CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
NONE
AV:N/AC:L/Au:S/C:C/I:C/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS
Percentile
69.5%
The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:5082 advisory.
samba: SMB1 client connections can be downgraded to plaintext authentication (CVE-2016-2124)
samba: Active Directory (AD) domain user could become root on domain members (CVE-2020-25717)
samba: Subsequent DCE/RPC fragment injection vulnerability (CVE-2021-23192)
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 70300
##
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from
# Red Hat Security Advisory RHSA-2021:5082. The text
# itself is copyright (C) Red Hat, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(156238);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/28");
script_cve_id("CVE-2016-2124", "CVE-2020-25717", "CVE-2021-23192");
script_xref(name:"RHSA", value:"2021:5082");
script_name(english:"CentOS 8 : samba (CESA-2021:5082)");
script_set_attribute(attribute:"synopsis", value:
"The remote CentOS host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the
CESA-2021:5082 advisory.
- samba: SMB1 client connections can be downgraded to plaintext authentication (CVE-2016-2124)
- samba: Active Directory (AD) domain user could become root on domain members (CVE-2020-25717)
- samba: Subsequent DCE/RPC fragment injection vulnerability (CVE-2021-23192)
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://access.redhat.com/errata/RHSA-2021:5082");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:N");
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:L/UI:N/S:U/C:H/I:H/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-25717");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/11/09");
script_set_attribute(attribute:"patch_publication_date", value:"2021/12/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/12/21");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ctdb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libsmbclient");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libsmbclient-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libwbclient");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libwbclient-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-samba");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-samba-test");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-client");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-client-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-common-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-common-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-krb5-printing");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-pidl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-test");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-test-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-vfs-iouring");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-clients");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-krb5-locator");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winexe");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CentOS Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2022 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('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
include('rpm.inc');
include('rhel.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/CentOS/release');
if (isnull(release) || 'CentOS' >!< release) audit(AUDIT_OS_NOT, 'CentOS');
var os_ver = pregmatch(pattern: "CentOS(?: Stream)?(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS');
var os_ver = os_ver[1];
if ('CentOS Stream' >< release) audit(AUDIT_OS_NOT, 'CentOS 8.x', 'CentOS Stream ' + os_ver);
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '8')) audit(AUDIT_OS_NOT, 'CentOS 8.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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS', cpu);
var pkgs = [
{'reference':'ctdb-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ctdb-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libsmbclient-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libsmbclient-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libsmbclient-devel-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libsmbclient-devel-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libwbclient-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libwbclient-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libwbclient-devel-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libwbclient-devel-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-samba-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-samba-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-samba-test-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-samba-test-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-client-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-client-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-client-libs-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-client-libs-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-common-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-common-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-common-libs-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-common-libs-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-common-tools-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-common-tools-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-devel-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-devel-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-krb5-printing-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-krb5-printing-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-libs-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-libs-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-pidl-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-pidl-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-test-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-test-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-test-libs-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-test-libs-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-vfs-iouring-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-vfs-iouring-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winbind-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winbind-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winbind-clients-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winbind-clients-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winbind-krb5-locator-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winbind-krb5-locator-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winbind-modules-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winbind-modules-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winexe-4.14.5-7.el8_5', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'samba-winexe-4.14.5-7.el8_5', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
];
var flag = 0;
foreach 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 = 'CentOS-' + 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, 'ctdb / libsmbclient / libsmbclient-devel / libwbclient / etc');
}
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
NONE
AV:N/AC:L/Au:S/C:C/I:C/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS
Percentile
69.5%