6.4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
5.4 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
0.01 Low
EPSS
Percentile
83.7%
The version of Samba running on the remote host is 4.x prior to 4.9.17, 4.10.x prior to 4.10.11, or 4.11.x prior to 4.11.3. It is, therefore, affected by multiple vulnerabilities:
A denial of service (DoS) vulnerability exists in the ldb_qsort() and dns_name_compare() routines due to how the routines handle case sensitivity of DNS records. An authenticated, remote attacker can exploit this issue, by registering a DNS record matching the name of the DNS zone, to cause the process to stop responding. (CVE-2019-14861)
An issue exists where the S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos authentication, by forcing all tickets for these clients to be non-forwardable. In AD this is implemented by a user attribute delegation_not_allowed (aka not-delegated), which translates to disallow-forwardable.
However the Samba AD DC does not do that for S4U2Self and does set the forwardable flag even if the impersonated client has the not-delegated flag set. (CVE-2019-14870)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#
# (C) Tenable Network Security, Inc.
#
include('compat.inc');
if (description)
{
script_id(132023);
script_version("1.4");
script_cvs_date("Date: 2020/01/23");
script_cve_id("CVE-2019-14861", "CVE-2019-14870");
script_name(english:"Samba 4.x < 4.9.17 / 4.10.x < 4.10.11 / 4.11.x < 4.11.3 Multiple Vulnerabilities");
script_summary(english:"Checks the version of Samba.");
script_set_attribute(attribute:"synopsis", value:
"The remote Samba server is potentially affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The version of Samba running on the remote host is 4.x prior to 4.9.17, 4.10.x prior to 4.10.11, or 4.11.x prior to
4.11.3. It is, therefore, affected by multiple vulnerabilities:
- A denial of service (DoS) vulnerability exists in the ldb_qsort() and dns_name_compare() routines due to
how the routines handle case sensitivity of DNS records. An authenticated, remote attacker can exploit
this issue, by registering a DNS record matching the name of the DNS zone, to cause the process to stop
responding. (CVE-2019-14861)
- An issue exists where the S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset
of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos
authentication, by forcing all tickets for these clients to be non-forwardable. In AD this is implemented
by a user attribute delegation_not_allowed (aka not-delegated), which translates to disallow-forwardable.
However the Samba AD DC does not do that for S4U2Self and does set the forwardable flag even if the
impersonated client has the not-delegated flag set. (CVE-2019-14870)
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://www.samba.org/samba/security/CVE-2019-14861.html");
script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2019-14870.html");
script_set_attribute(attribute:"solution", value:
"Upgrade to Samba version 4.9.17 / 4.10.11 / 4.11.3 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/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:L/I:L/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-2019-14870");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/12/10");
script_set_attribute(attribute:"patch_publication_date", value:"2019/12/10");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/13");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:samba:samba");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("smb_nativelanman.nasl");
script_require_keys("SMB/NativeLanManager", "SMB/samba", "Settings/ParanoidReport");
exit(0);
}
include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
include('vcf.inc');
include('vcf_extras.inc');
if (report_paranoia < 2) audit(AUDIT_PARANOID);
app = vcf::samba::get_app_info();
vcf::check_granularity(app_info:app, sig_segments:3);
constraints = [
{'min_version':'4.0.0', 'fixed_version':'4.9.17'},
{'min_version':'4.10.0', 'fixed_version':'4.10.11'},
{'min_version':'4.11.0', 'fixed_version':'4.11.3'}
];
vcf::check_version_and_report(app_info:app, constraints:constraints, severity:SECURITY_WARNING, strict:FALSE);
6.4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
5.4 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
0.01 Low
EPSS
Percentile
83.7%