EulerOS Virtualization 2.11.1 : krb5 (EulerOS-SA-2026-3425)

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

include('compat.inc');

if (description)
{
  script_id(347993);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/18");

  script_cve_id(
    "CVE-2025-3576",
    "CVE-2025-24528",
    "CVE-2026-40355",
    "CVE-2026-40356"
  );

  script_name(english:"EulerOS Virtualization 2.11.1 : krb5 (EulerOS-SA-2026-3425)");

  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 krb5 packages installed, the EulerOS Virtualization installation on the remote host is
affected by the following vulnerabilities :

    A flaw was found in krb5. With incremental propagation enabled, an authenticated attacker can cause
    kadmind to write beyond the end of the mapped region for the iprop log file. This issue can trigger a
    process crash and lead to a denial of service.(CVE-2025-24528)

    A vulnerability in the MIT Kerberos implementation allows GSSAPI-protected messages using RC4-HMAC-MD5 to
    be spoofed due to weaknesses in the MD5 checksum design. If RC4 is preferred over stronger encryption
    types, an attacker could exploit MD5 collisions to forge message integrity codes. This may lead to
    unauthorized message tampering.(CVE-2025-3576)

    In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls
    gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An
    unauthenticated remote attacker can trigger this, causing the process to terminate in
    parse_nego_message.(CVE-2026-40355)

    In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read
    if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in
    /etc/gss/mech. An unauthenticated remote attacker can trigger this, possibly causing the process to
    terminate in parse_message.(CVE-2026-40356)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization krb5 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-2026-3425
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c78fd514");
  script_set_attribute(attribute:"solution", value:
"Update the affected krb5 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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:N/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-2026-40356");

  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:"2025/02/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:krb5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:krb5-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:krb5-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:krb5-server");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.11.1");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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 != "2.11.1") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.11.1");
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 = [
  "krb5-1.19.2-2.h25.eulerosv2r11",
  "krb5-client-1.19.2-2.h25.eulerosv2r11",
  "krb5-libs-1.19.2-2.h25.eulerosv2r11",
  "krb5-server-1.19.2-2.h25.eulerosv2r11"
];

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, "krb5");
}