CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
23.6%
The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has cloud-init packages installed that are affected by multiple vulnerabilities:
The default cloud-init configuration, in cloud-init 0.6.2 and newer, included ssh_deletekeys: 0, disabling cloud-init’s deletion of ssh host keys. In some environments, this could lead to instances created by cloning a golden master or template system, sharing ssh host keys, and being able to impersonate one another or conduct man-in-the-middle attacks. (CVE-2018-10896)
A security feature bypass exists in Azure SSH Keypairs, due to a change in the provisioning logic for some Linux images that use cloud-init, aka ‘Azure SSH Keypairs Security Feature Bypass Vulnerability’.
(CVE-2019-0816)
cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it easier for attackers to predict passwords, because rand_str in cloudinit/util.py calls the random.choice function.
(CVE-2020-8631)
In cloud-init through 19.4, rand_user_password in cloudinit/config/cc_set_passwords.py has a small default pwlen value, which makes it easier for attackers to guess passwords. (CVE-2020-8632)
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 descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2021-0151. The text
# itself is copyright (C) ZTE, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(154516);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/27");
script_cve_id(
"CVE-2018-10896",
"CVE-2019-0816",
"CVE-2020-8631",
"CVE-2020-8632"
);
script_name(english:"NewStart CGSL CORE 5.05 / MAIN 5.05 : cloud-init Multiple Vulnerabilities (NS-SA-2021-0151)");
script_set_attribute(attribute:"synopsis", value:
"The remote NewStart CGSL host is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has cloud-init packages installed that are
affected by multiple vulnerabilities:
- The default cloud-init configuration, in cloud-init 0.6.2 and newer, included ssh_deletekeys: 0,
disabling cloud-init's deletion of ssh host keys. In some environments, this could lead to instances
created by cloning a golden master or template system, sharing ssh host keys, and being able to
impersonate one another or conduct man-in-the-middle attacks. (CVE-2018-10896)
- A security feature bypass exists in Azure SSH Keypairs, due to a change in the provisioning logic for some
Linux images that use cloud-init, aka 'Azure SSH Keypairs Security Feature Bypass Vulnerability'.
(CVE-2019-0816)
- cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it easier for
attackers to predict passwords, because rand_str in cloudinit/util.py calls the random.choice function.
(CVE-2020-8631)
- In cloud-init through 19.4, rand_user_password in cloudinit/config/cc_set_passwords.py has a small default
pwlen value, which makes it easier for attackers to guess passwords. (CVE-2020-8632)
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:"http://security.gd-linux.com/notice/NS-SA-2021-0151");
script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2018-10896");
script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2019-0816");
script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2020-8631");
script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2020-8632");
script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL cloud-init packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:N");
script_set_cvss_temporal_vector("CVSS2#E:F/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:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-10896");
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:"2018/08/01");
script_set_attribute(attribute:"patch_publication_date", value:"2021/09/24");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/10/27");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_core:cloud-init");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:cloud-init");
script_set_attribute(attribute:"cpe", value:"cpe:/o:zte:cgsl_core:5");
script_set_attribute(attribute:"cpe", value:"cpe:/o:zte:cgsl_main:5");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"NewStart CGSL Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");
exit(0);
}
include('audit.inc');
include('global_settings.inc');
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/ZTE-CGSL/release');
if (isnull(release) || release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, 'NewStart Carrier Grade Server Linux');
if (release !~ "CGSL CORE 5.05" &&
release !~ "CGSL MAIN 5.05")
audit(AUDIT_OS_NOT, 'NewStart CGSL CORE 5.05 / NewStart CGSL MAIN 5.05');
if (!get_kb_item('Host/ZTE-CGSL/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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'NewStart Carrier Grade Server Linux', cpu);
var flag = 0;
var pkgs = {
'CGSL CORE 5.05': [
'cloud-init-19.4-7.el7.2.cgslv5_5.0.18.g3a2d17e.lite'
],
'CGSL MAIN 5.05': [
'cloud-init-19.4-7.el7.2.cgslv5_5.0.15.g7e651e9'
]
};
var pkg_list = pkgs[release];
foreach (pkg in pkg_list)
if (rpm_check(release:'ZTE ' + release, reference:pkg)) 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, 'cloud-init');
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10896
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-0816
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8631
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8632
security.gd-linux.com/info/CVE-2018-10896
security.gd-linux.com/info/CVE-2019-0816
security.gd-linux.com/info/CVE-2020-8631
security.gd-linux.com/info/CVE-2020-8632
security.gd-linux.com/notice/NS-SA-2021-0151
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
23.6%