NewStart CGSL MAIN 6.06 : bind Multiple Vulnerabilities (NS-SA-2023-0094)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2023-0094. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(187328);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/27");

  script_cve_id(
    "CVE-2018-5743",
    "CVE-2019-6465",
    "CVE-2019-6471",
    "CVE-2020-8616",
    "CVE-2020-8617",
    "CVE-2020-8622",
    "CVE-2020-8623",
    "CVE-2020-8624",
    "CVE-2020-8625",
    "CVE-2021-25219",
    "CVE-2022-38177",
    "CVE-2022-38178"
  );

  script_name(english:"NewStart CGSL MAIN 6.06 : bind Multiple Vulnerabilities (NS-SA-2023-0094)");

  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 MAIN 6.06, has bind packages installed that are affected by multiple
vulnerabilities:

  - By design, BIND is intended to limit the number of TCP clients that can be connected at any given time.
    The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value
    for most servers. Unfortunately, the code which was intended to limit the number of simultaneous
    connections contained an error which could be exploited to grow the number of simultaneous connections
    beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0.
    BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7
    of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for
    vulnerability to CVE-2018-5743. (CVE-2018-5743)

  - Controls for zone transfers may not be properly applied to Dynamically Loadable Zones (DLZs) if the zones
    are writable Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P2, 9.12.0 -> 9.12.3-P2, and
    versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.6 of the 9.13
    development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for
    vulnerability to CVE-2019-6465. (CVE-2019-6465)

  - A race condition which may occur when discarding malformed packets can result in BIND exiting due to a
    REQUIRE assertion failure in dispatch.c. Versions affected: BIND 9.11.0 -> 9.11.7, 9.12.0 -> 9.12.4-P1,
    9.14.0 -> 9.14.2. Also all releases of the BIND 9.13 development branch and version 9.15.0 of the BIND
    9.15 development branch and BIND Supported Preview Edition versions 9.11.3-S1 -> 9.11.7-S1.
    (CVE-2019-6471)

  - A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches
    performed when processing referrals can, through the use of specially crafted referrals, cause a recursing
    server to issue a very large number of fetches in an attempt to process the referral. This has at least
    two potential effects: The performance of the recursing server can potentially be degraded by the
    additional work required to perform these fetches, and The attacker can exploit this behavior to use the
    recursing server as a reflector in a reflection attack with a high amplification factor. (CVE-2020-8616)

  - Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an
    inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the
    server. Since BIND, by default, configures a local session key even on servers whose configuration does
    not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating
    from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately
    exits. Prior to the introduction of the check the server would continue operating in an inconsistent
    state, with potentially harmful results. (CVE-2020-8617)

  - In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the
    BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating
    the server receiving the TSIG-signed request, could send a truncated response to that request, triggering
    an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to
    correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and
    message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.
    (CVE-2020-8622)

  - In BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the
    BIND 9 Supported Preview Edition, An attacker that can reach a vulnerable system with a specially crafted
    query packet can trigger a crash. To be vulnerable, the system must: * be running BIND that was built with
    --enable-native-pkcs11 * be signing one or more zones with an RSA key * be able to receive queries from
    a possible attacker (CVE-2020-8623)

  - In BIND 9.9.12 -> 9.9.13, 9.10.7 -> 9.10.8, 9.11.3 -> 9.11.21, 9.12.1 -> 9.16.5, 9.17.0 -> 9.17.3, also
    affects 9.9.12-S1 -> 9.9.13-S1, 9.11.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An
    attacker who has been granted privileges to change a specific subset of the zone's content could abuse
    these unintended additional privileges to update other contents of the zone. (CVE-2020-8624)

  - BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG
    features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed,
    but a server can be rendered vulnerable by explicitly setting valid values for the tkey-gssapi-keytab or
    tkey-gssapi-credentialconfiguration options. Although the default configuration is not vulnerable, GSS-
    TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server
    environments that combine BIND servers with Active Directory domain controllers. The most likely outcome
    of a successful exploitation of the vulnerability is a crash of the named process. However, remote code
    execution, while unproven, is theoretically possible. Affects: BIND 9.5.0 -> 9.11.27, 9.12.0 -> 9.16.11,
    and versions BIND 9.11.3-S1 -> 9.11.27-S1 and 9.16.8-S1 -> 9.16.11-S1 of BIND Supported Preview Edition.
    Also release versions 9.17.0 -> 9.17.1 of the BIND 9.17 development branch (CVE-2020-8625)

  - In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 ->
    9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND
    9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing
    can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it
    possible for its internal data structures to grow almost infinitely, which may cause significant delays in
    client query processing. (CVE-2021-25219)

  - By spoofing the target resolver with responses that have a malformed ECDSA signature, an attacker can
    trigger a small memory leak. It is possible to gradually erode available memory to the point where named
    crashes for lack of resources. (CVE-2022-38177)

  - By spoofing the target resolver with responses that have a malformed EdDSA signature, an attacker can
    trigger a small memory leak. It is possible to gradually erode available memory to the point where named
    crashes for lack of resources. (CVE-2022-38178)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/notice/NS-SA-2023-0094");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2018-5743");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2019-6465");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2019-6471");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-8616");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-8617");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-8622");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-8623");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-8624");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-8625");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2021-25219");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2022-38177");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2022-38178");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL bind 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:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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-2020-8625");

  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:"2019/02/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/05/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/12/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:bind-export-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:bind-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:bind-libs-lite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:bind-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:bind-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:python3-bind");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:zte:cgsl_main:6");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"NewStart CGSL 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/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");

  exit(0);
}

include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var os_release = get_kb_item('Host/ZTE-CGSL/release');
if (isnull(os_release) || os_release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, 'NewStart Carrier Grade Server Linux');

if (os_release !~ "CGSL MAIN 6.06")
  audit(AUDIT_OS_NOT, 'NewStart CGSL MAIN 6.06');

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 MAIN 6.06': [
    'bind-export-libs-9.11.36-3.zncgsl6_6.1',
    'bind-libs-9.11.36-3.zncgsl6_6.1',
    'bind-libs-lite-9.11.36-3.zncgsl6_6.1',
    'bind-license-9.11.36-3.zncgsl6_6.1',
    'bind-utils-9.11.36-3.zncgsl6_6.1',
    'python3-bind-9.11.36-3.zncgsl6_6.1'
  ]
};
var pkg_list = pkgs[os_release];

foreach (pkg in pkg_list)
  if (rpm_check(release:'ZTE ' + os_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, 'bind');
}