EulerOS Virtualization 2.13.0 : glibc (EulerOS-SA-2026-2399)

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

include('compat.inc');

if (description)
{
  script_id(320705);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/12");

  script_cve_id("CVE-2026-4046", "CVE-2026-5450", "CVE-2026-5928");

  script_name(english:"EulerOS Virtualization 2.13.0 : glibc (EulerOS-SA-2026-2399)");

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

    Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version
    2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in
    a one byte heap buffer overflow.(CVE-2026-5450)

    Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has
    overlaps between its single byte and multi-byte character encodings, in the GNU C Library version 2.43 or
    earlier, may result in an attempt to read bytes before an allocated buffer, potentially resulting in
    unintentional disclosure of neighboring data in the heap, or a program crash.A bug in the wide character
    pushback implementation (_IO_wdefault_pbackfail in libio/wgenops.c) causes ungetwc() to operate on the
    regular character buffer (fp-_IO_read_ptr) instead of the actual wide-stream read pointer (fp-
    _wide_data-_IO_read_ptr). The program crash may happen in cases where fp-_IO_read_ptr is not
    initialized and hence points to NULL. The buffer under-read requires a special situation where the input
    character encoding is such that there are overlaps between single byte representations and multibyte
    representations in that encoding, resulting in spurious matches. The spurious match case is not possible
    in the standard Unicode character sets.(CVE-2026-5928)

    The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure
    when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an
    application.This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character
    sets from systems that do not need them.(CVE-2026-4046)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization glibc 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-2026-2399
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?dbe405c2");
  script_set_attribute(attribute:"solution", value:
"Update the affected glibc packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/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: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-2026-5450");

  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:"2026/03/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:glibc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:glibc-all-langpacks");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:glibc-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:glibc-debugutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:glibc-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:glibc-help");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:glibc-locale-archive");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:glibc-locale-source");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libnsl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:nscd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.13.0");
  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 != "2.13.0") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.13.0");
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$" && "aarch64" >!< cpu && "x86" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "x86" >!< cpu) audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

var flag = 0;

var pkgs = [
  "glibc-2.34-143.h47.eulerosv2r13",
  "glibc-all-langpacks-2.34-143.h47.eulerosv2r13",
  "glibc-common-2.34-143.h47.eulerosv2r13",
  "glibc-debugutils-2.34-143.h47.eulerosv2r13",
  "glibc-devel-2.34-143.h47.eulerosv2r13",
  "glibc-help-2.34-143.h47.eulerosv2r13",
  "glibc-locale-archive-2.34-143.h47.eulerosv2r13",
  "glibc-locale-source-2.34-143.h47.eulerosv2r13",
  "libnsl-2.34-143.h47.eulerosv2r13",
  "nscd-2.34-143.h47.eulerosv2r13"
];

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, "glibc");
}