CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS
Percentile
85.0%
The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has dnsmasq packages installed that are affected by multiple vulnerabilities:
A vulnerability was found in dnsmasq before version 2.81, where the memory leak allows remote attackers to cause a denial of service (memory consumption) via vectors involving DHCP response creation.
(CVE-2019-14834)
A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query’s attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity. (CVE-2020-25684)
A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced.
The highest threat from this vulnerability is to data integrity. (CVE-2020-25685)
A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name.
This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the Birthday Attacks section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
(CVE-2020-25686)
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-2021-0183. The text
# itself is copyright (C) ZTE, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(154439);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/05");
script_cve_id(
"CVE-2019-14834",
"CVE-2020-25684",
"CVE-2020-25685",
"CVE-2020-25686"
);
script_xref(name:"IAVA", value:"2020-A-0194-S");
script_xref(name:"IAVA", value:"2021-A-0041");
script_xref(name:"CEA-ID", value:"CEA-2021-0003");
script_name(english:"NewStart CGSL CORE 5.05 / MAIN 5.05 : dnsmasq Multiple Vulnerabilities (NS-SA-2021-0183)");
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 dnsmasq packages installed that are affected
by multiple vulnerabilities:
- A vulnerability was found in dnsmasq before version 2.81, where the memory leak allows remote attackers to
cause a denial of service (memory consumption) via vectors involving DHCP response creation.
(CVE-2019-14834)
- A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq
checks in the forward.c:reply_query() if the reply destination address/port is used by the pending
forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query,
substantially reducing the number of attempts an attacker on the network would have to perform to forge a
reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's
attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache
Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful
attack is reduced. The highest threat from this vulnerability is to data integrity. (CVE-2020-25684)
- A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq
checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a
weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1
when it is) this flaw allows an off-path attacker to find several different domains all having the same
hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it
accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the
attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache
Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced.
The highest threat from this vulnerability is to data integrity. (CVE-2020-25685)
- A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an
existing pending request for the same name and forwards a new request. By default, a maximum of 150
pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name.
This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that
it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the
Birthday Attacks section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a
successful attack is reduced. The highest threat from this vulnerability is to data integrity.
(CVE-2020-25686)
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-2021-0183");
script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2019-14834");
script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2020-25684");
script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2020-25685");
script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2020-25686");
script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL dnsmasq packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/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:H/PR:N/UI:N/S:U/C:N/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-2020-25686");
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:"2020/01/07");
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:dnsmasq");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_core:dnsmasq-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_core:dnsmasq-utils");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:dnsmasq");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:dnsmasq-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:dnsmasq-utils");
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_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"NewStart CGSL Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/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': [
'dnsmasq-2.76-16.el7_9.1',
'dnsmasq-debuginfo-2.76-16.el7_9.1',
'dnsmasq-utils-2.76-16.el7_9.1'
],
'CGSL MAIN 5.05': [
'dnsmasq-2.76-16.el7_9.1',
'dnsmasq-debuginfo-2.76-16.el7_9.1',
'dnsmasq-utils-2.76-16.el7_9.1'
]
};
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_WARNING,
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, 'dnsmasq');
}
Vendor | Product | Version | CPE |
---|---|---|---|
zte | cgsl_main | dnsmasq | p-cpe:/a:zte:cgsl_main:dnsmasq |
zte | cgsl_core | dnsmasq | p-cpe:/a:zte:cgsl_core:dnsmasq |
zte | cgsl_main | 5 | cpe:/o:zte:cgsl_main:5 |
zte | cgsl_core | dnsmasq-debuginfo | p-cpe:/a:zte:cgsl_core:dnsmasq-debuginfo |
zte | cgsl_main | dnsmasq-utils | p-cpe:/a:zte:cgsl_main:dnsmasq-utils |
zte | cgsl_main | dnsmasq-debuginfo | p-cpe:/a:zte:cgsl_main:dnsmasq-debuginfo |
zte | cgsl_core | 5 | cpe:/o:zte:cgsl_core:5 |
zte | cgsl_core | dnsmasq-utils | p-cpe:/a:zte:cgsl_core:dnsmasq-utils |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14834
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25684
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25685
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25686
security.gd-linux.com/info/CVE-2019-14834
security.gd-linux.com/info/CVE-2020-25684
security.gd-linux.com/info/CVE-2020-25685
security.gd-linux.com/info/CVE-2020-25686
security.gd-linux.com/notice/NS-SA-2021-0183
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS
Percentile
85.0%