Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : GoBGP vulnerabilities (USN-8348-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8348-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(318621);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/09");

  script_cve_id(
    "CVE-2026-7734",
    "CVE-2026-7735",
    "CVE-2026-7736",
    "CVE-2026-7737",
    "CVE-2026-37461",
    "CVE-2026-41643"
  );
  script_xref(name:"USN", value:"8348-1");

  script_name(english:"Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : GoBGP vulnerabilities (USN-8348-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are
affected by multiple vulnerabilities as referenced in the USN-8348-1 advisory.

    It was discovered that GoBGP incorrectly handled certain specially crafted BGP UPDATE messages. A remote
    attacker could possibly use this issue to cause GoBGP to crash, resulting in a denial of service.
    (CVE-2026-37461)

    Yanlei Wang discovered that GoBGP incorrectly handled certain malformed BGP UPDATE messages containing
    4-byte AS attributes. A remote attacker could possibly use this issue to cause GoBGP to crash, resulting
    in a denial of service. (CVE-2026-41643)

    It was discovered that GoBGP incorrectly handled certain malformed BGP UPDATE messages containing SRv6 L3
    Service attributes. A remote attacker could possibly use this issue to cause GoBGP to crash, resulting in
    a denial of service. (CVE-2026-7734)

    It was discovered that GoBGP incorrectly handled certain malformed BGP UPDATE messages containing
    Accumulated IGP (AIGP) attributes. A remote attacker could possibly use this issue to cause GoBGP to
    crash, resulting in a denial of service. (CVE-2026-7735)

    It was discovered that GoBGP incorrectly handled certain malformed Multi- threaded Routing Toolkit (MRT)
    routing information entries. A remote attacker could possibly use this issue to cause GoBGP to crash,
    resulting in a denial of service. (CVE-2026-7736)

    It was discovered that GoBGP incorrectly handled certain malformed Multi- threaded Routing Toolkit (MRT)
    headers. A remote attacker could possibly use this issue to cause GoBGP to crash, resulting in a denial of
    service. (CVE-2026-7737)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-8348-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected gobgpd and / or golang-github-osrg-gobgp-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-7735");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-7737");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-7737");

  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:"2026/04/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gobgpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:golang-github-osrg-gobgp-dev");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 18.04 / 20.04 / 22.04 / 24.04 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);
var ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '18.04', 'pkgname': 'gobgpd', 'pkgver': '1.29-1ubuntu0.1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'golang-github-osrg-gobgp-dev', 'pkgver': '1.29-1ubuntu0.1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'gobgpd', 'pkgver': '2.12.0-1ubuntu0.1~esm3', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'golang-github-osrg-gobgp-dev', 'pkgver': '2.12.0-1ubuntu0.1~esm3', 'ubuntu_pro': TRUE},
    {'osver': '22.04', 'pkgname': 'gobgpd', 'pkgver': '2.25.0-3ubuntu0.1+esm4', 'ubuntu_pro': TRUE},
    {'osver': '22.04', 'pkgname': 'golang-github-osrg-gobgp-dev', 'pkgver': '2.25.0-3ubuntu0.1+esm4', 'ubuntu_pro': TRUE},
    {'osver': '24.04', 'pkgname': 'gobgpd', 'pkgver': '3.23.0-1ubuntu0.3+esm4', 'ubuntu_pro': TRUE},
    {'osver': '24.04', 'pkgname': 'golang-github-osrg-gobgp-dev', 'pkgver': '3.23.0-1ubuntu0.3+esm4', 'ubuntu_pro': TRUE},
    {'osver': '26.04', 'pkgname': 'gobgpd', 'pkgver': '3.36.0-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE},
    {'osver': '26.04', 'pkgname': 'golang-github-osrg-gobgp-dev', 'pkgver': '3.36.0-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'gobgpd / golang-github-osrg-gobgp-dev');
}