NewStart CGSL MAIN 7.02 : postfix Vulnerability (NS-SA-2025-0159)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2025-0159. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(242801);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/07/25");

  script_cve_id("CVE-2023-51764");

  script_name(english:"NewStart CGSL MAIN 7.02 : postfix Vulnerability (NS-SA-2025-0159)");

  script_set_attribute(attribute:"synopsis", value:
"The remote NewStart CGSL host is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version MAIN 7.02, has postfix packages installed that are affected by a
vulnerability:

  - Postfix through 3.8.5 allows SMTP smuggling unless configured with
    smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain
    other options that exist in recent versions). Remote attackers can use a published exploitation technique
    to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection
    mechanism. This occurs because Postfix supports <LF>.<CR><LF> but some other popular e-mail servers do
    not. To prevent attack variants (by always disallowing <LF> without <CR>), a different solution is
    required, such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23,
    3.6.13, 3.7.9, 3.8.4, or 3.9. (CVE-2023-51764)

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-2025-0159");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2023-51764");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL postfix 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:L/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-51764");

  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:"2023/12/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:postfix");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:postfix-perl-scripts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:zte:cgsl_main:7");
  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) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");

  exit(0);
}

include('rpm2.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\sMAIN\s7\.02")
  audit(AUDIT_OS_NOT, 'NewStart CGSL MAIN 7.02');

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 7.02': [
    'postfix-3.7.9-1.zncgsl7.3',
    'postfix-perl-scripts-3.7.9-1.zncgsl7.3'
  ]
};
var pkg_list = pkgs[os_release];
var pkg;
foreach (pkg in pkg_list)
  if (rpm_check(reference:pkg, release:'ZTE ' + os_release, rpm_spec_vers_cmp:TRUE)) 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, 'postfix');
}