EulerOS Virtualization 2.10.0 : gnutls (EulerOS-SA-2026-2851)

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

include('compat.inc');

if (description)
{
  script_id(328607);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/21");

  script_cve_id(
    "CVE-2026-33845",
    "CVE-2026-33846",
    "CVE-2026-42009",
    "CVE-2026-42010",
    "CVE-2026-42014"
  );
  script_xref(name:"IAVA", value:"2026-A-0405");

  script_name(english:"EulerOS Virtualization 2.10.0 : gnutls (EulerOS-SA-2026-2851)");

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

    A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer
    Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by
    sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to
    unstable packet ordering or undefined behavior, resulting in a denial of service.(CVE-2026-42009)

    A flaw was found in GnuTLS. The `gnutls_pkcs11_token_set_pin` function, used for changing the Security
    Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change
    the PIN with a NULL old PIN for a token that lacks a protected authentication path.(CVE-2026-42014)

    A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest-Shamir-Adleman - Pre-Shared Key)
    wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could
    exploit this by sending a specially crafted username, leading to an authentication bypass. This
    vulnerability allows an attacker to gain unauthorized access by circumventing the authentication
    process.(CVE-2026-42010)

    A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The
    issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based
    solely on handshake type, without validating that the message_length field remains consistent across all
    fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with
    conflicting message_length values, causing the implementation to allocate a buffer based on a smaller
    initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because
    the merge operation does not enforce proper bounds checking against the allocated buffer size, this
    results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without
    authentication via the DTLS handshake path and can lead to application crashes or potential memory
    corruption.(CVE-2026-33846)

    A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset,
    leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is
    remotely exploitable and may cause information disclosure or denial of service.(CVE-2026-33845)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization gnutls 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-2026-2851
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fab12279");
  script_set_attribute(attribute:"solution", value:
"Update the affected gnutls 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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-42010");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnutls-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.10.0");
  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 != "2.10.0") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.10.0");
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 = [
  "gnutls-3.6.14-6.h23.eulerosv2r10",
  "gnutls-utils-3.6.14-6.h23.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, "gnutls");
}