EulerOS Virtualization 2.13.1 : avahi (EulerOS-SA-2026-2365)

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

include('compat.inc');

if (description)
{
  script_id(320696);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/12");

  script_cve_id("CVE-2026-24401", "CVE-2026-34933");

  script_name(english:"EulerOS Virtualization 2.13.1 : avahi (EulerOS-SA-2026-2365)");

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

    Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol
    suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single
    D-Bus method call with conflicting publish flags. This issue has been patched in version
    0.9-rc4.(CVE-2026-34933)

    Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol
    suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an
    unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to
    the same domain (e.g., 'h.local' as a CNAME for 'h.local'). This causes unbounded recursion in the
    lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where
    AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by
    nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524.(CVE-2026-24401)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization avahi 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-2026-2365
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?88974c59");
  script_set_attribute(attribute:"solution", value:
"Update the affected avahi 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:R/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-2026-24401");

  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:"2026/01/24");
  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:avahi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:avahi-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:avahi-glib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:avahi-help");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:avahi-libs");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.13.1");
  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 != "2.13.1") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.13.1");
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 = [
  "avahi-0.8-18.h6.eulerosv2r13",
  "avahi-devel-0.8-18.h6.eulerosv2r13",
  "avahi-glib-0.8-18.h6.eulerosv2r13",
  "avahi-help-0.8-18.h6.eulerosv2r13",
  "avahi-libs-0.8-18.h6.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, "avahi");
}