Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 24.04 LTS : CivetWeb vulnerabilities (USN-8749-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8749-1. 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(345734);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/14");

  script_cve_id("CVE-2025-9648", "CVE-2025-55763");
  script_xref(name:"USN", value:"8749-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 24.04 LTS : CivetWeb vulnerabilities (USN-8749-1)");

  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 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 24.04 LTS host has packages installed that are
affected by multiple vulnerabilities as referenced in the USN-8749-1 advisory.

    It was discovered that CivetWeb did not correctly handle parsing certain URIs. A remote attacker could
    possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected
    Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2025-55763)

    It was discovered that CivetWeb did not correctly handle parsing certain HTTP requests. A remote attacker
    could possibly use this issue to cause a denial of service. (CVE-2025-9648)

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-8749-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected civetweb and / or libcivetweb1 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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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-2025-55763");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2025-9648");

  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:"2025/08/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:"cpe:/o:canonical:ubuntu_linux:Pro:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:civetweb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcivetweb1");
  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");
  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 (! ('22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release || 'Pro' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 26.04 / Pro', '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 pkgs = [
    {'osver': '22.04', 'pkgname': 'civetweb', 'pkgver': '1.15+dfsg-3ubuntu0.1~esm1', 'cves': ['CVE-2025-9648', 'CVE-2025-55763']},
    {'osver': '22.04', 'pkgname': 'libcivetweb1', 'pkgver': '1.15+dfsg-3ubuntu0.1~esm1', 'cves': ['CVE-2025-9648', 'CVE-2025-55763']},
    {'osver': '24.04', 'pkgname': 'civetweb', 'pkgver': '1.16+dfsg-1ubuntu0.1', 'cves': ['CVE-2025-9648', 'CVE-2025-55763']},
    {'osver': '24.04', 'pkgname': 'libcivetweb1', 'pkgver': '1.16+dfsg-1ubuntu0.1', 'cves': ['CVE-2025-9648', 'CVE-2025-55763']},
    {'osver': '26.04', 'pkgname': 'civetweb', 'pkgver': '1.16+dfsg-3ubuntu0.1', 'cves': ['CVE-2025-9648']},
    {'osver': '26.04', 'pkgname': 'libcivetweb1', 'pkgver': '1.16+dfsg-3ubuntu0.1', 'cves': ['CVE-2025-9648']},
    {'osver': 'Pro', 'pkgname': 'civetweb', 'pkgver': '1.16+dfsg-1ubuntu0.1', 'cves': ['CVE-2025-9648']},
    {'osver': 'Pro', 'pkgname': 'libcivetweb1', 'pkgver': '1.16+dfsg-1ubuntu0.1', 'cves': ['CVE-2025-9648']}
];

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'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  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, 'civetweb / libcivetweb1');
}