EulerOS Virtualization 2.10.1 : openssh (EulerOS-SA-2026-1135)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(297314);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/30");

  script_cve_id(
    "CVE-2025-26465",
    "CVE-2025-32728",
    "CVE-2025-61984",
    "CVE-2025-61985"
  );
  script_xref(name:"IAVA", value:"2025-A-0126-S");
  script_xref(name:"IAVA", value:"2025-A-0258-S");
  script_xref(name:"IAVA", value:"2025-A-0729-S");
  script_xref(name:"IAVA", value:"2025-A-0806-S");

  script_name(english:"EulerOS Virtualization 2.10.1 : openssh (EulerOS-SA-2026-1135)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS Virtualization host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the openssh packages installed, the EulerOS Virtualization installation on the remote host
is affected by the following vulnerabilities :

    ssh in OpenSSH before 10.1 allows the '\0' character in an ssh:// URI, potentially leading to code
    execution when a ProxyCommand is used.(CVE-2025-61985)

    ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly
    untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted
    sources are the command line and %-sequence expansion of a configuration file. (A configuration file that
    provides a complete literal username is not categorized as an untrusted source.)(CVE-2025-61984)

    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)

    In sshd in OpenSSH before 10.0, the DisableForwarding directive does not adhere to the documentation
    stating that it disables X11 and agent forwarding.(CVE-2025-32728)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization openssh security
advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2026-1135
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bc3b5d55");
  script_set_attribute(attribute:"solution", value:
"Update the affected openssh packages.");
  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:"2026/01/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:openssh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:openssh-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:openssh-server");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.10.1");
  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:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/uvp_version");

  exit(0);
}

include("rpm.inc");

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

var _release = get_kb_item("Host/EulerOS/release");
if (isnull(_release) || _release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (uvp != "2.10.1") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.10.1");
if (!get_kb_item("Host/EulerOS/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$" && "aarch64" >!< cpu && "x86" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);

var flag = 0;

var pkgs = [
  "openssh-8.2p1-9.h60.eulerosv2r10",
  "openssh-clients-8.2p1-9.h60.eulerosv2r10",
  "openssh-server-8.2p1-9.h60.eulerosv2r10"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", reference:pkg)) 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");
}