NewStart CGSL MAIN 7.02 : openssh Vulnerability (NS-SA-2025-0089)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2025-0089. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(238004);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/06/18");

  script_cve_id("CVE-2025-26465");
  script_xref(name:"IAVA", value:"2025-A-0126-S");

  script_name(english:"NewStart CGSL MAIN 7.02 : openssh Vulnerability (NS-SA-2025-0089)");

  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 openssh packages installed that are affected by a
vulnerability:

  - A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle
    attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how
    OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be
    considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning
    the attack complexity high. (CVE-2025-26465)

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-2025-0089");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2025-26465");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL openssh 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:H/Au:N/C:C/I:C/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:H/PR:N/UI:R/S:U/C:H/I:H/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-2025-26465");

  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:"2023/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/05/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/06/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:openssh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:openssh-askpass");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:openssh-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:openssh-clients-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:openssh-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:openssh-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:openssh-server-core");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:zte:cgsl_main:7");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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) 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': [
    'openssh-9.3p2-1.zncgsl7.34',
    'openssh-askpass-9.3p2-1.zncgsl7.34',
    'openssh-clients-9.3p2-1.zncgsl7.34',
    'openssh-clients-core-9.3p2-1.zncgsl7.34',
    'openssh-core-9.3p2-1.zncgsl7.34',
    'openssh-server-9.3p2-1.zncgsl7.34',
    'openssh-server-core-9.3p2-1.zncgsl7.34'
  ]
};
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_HOLE,
    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, 'openssh');
}