Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : curl vulnerabilities (USN-8084-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8084-1. 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(302211);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/08");

  script_cve_id(
    "CVE-2025-0167",
    "CVE-2026-1965",
    "CVE-2026-3783",
    "CVE-2026-3784",
    "CVE-2026-3805"
  );
  script_xref(name:"IAVA", value:"2025-A-0085-S");
  script_xref(name:"USN", value:"8084-1");
  script_xref(name:"IAVA", value:"2026-A-0237-S");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : curl vulnerabilities (USN-8084-1)");

  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 / 25.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8084-1 advisory.

    Zhicheng Chen discovered that curl could incorrectly reuse the wrong connection for Negotiate-
    authenticated HTTP or HTTPS requests. This could result in the use of credentials from a different
    connection, contrary to expectations. (CVE-2026-1965)

    It was discovered that curl incorrectly leaked OAuth2 bearer tokens when following a redirect. This could
    result in tokens being sent to the wrong host, contrary to expectations. (CVE-2026-3783)

    Muhamad Arga Reksapati discovered that curl incorrectly reused existing HTTP proxy connections even if the
    request used different credentials. This could result in the use of incorrect credentials, contrary to
    expectations. (CVE-2026-3784)

    Daniel Wade discovered that curl incorrectly handled certain memory operations when doing a second SMB
    request to the same host. An attacker could use this issue to cause curl to crash, resulting in a denial
    of service, or possibly execute arbitrary code. This issue only affected Ubuntu 25.10. (CVE-2026-3805)

    Yihang Zhou discovered that curl incorrectly reused .netrc file credentials when following redirects. This
    could result in the use of credentials for a different host, contrary to expectations. This issue only
    affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2025-0167)

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-8084-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:N");
  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:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-1965");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-3784");

  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:"2023/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/13");

  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:25.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl3-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl3-nss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl3t64-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4-gnutls-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4-nss-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4-openssl-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4t64");
  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:"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 || '25.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.10', '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': 'curl', 'pkgver': '7.81.0-1ubuntu1.23', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '22.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.81.0-1ubuntu1.23', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '22.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.81.0-1ubuntu1.23', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '22.04', 'pkgname': 'libcurl4', 'pkgver': '7.81.0-1ubuntu1.23', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '22.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '7.81.0-1ubuntu1.23', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '22.04', 'pkgname': 'libcurl4-nss-dev', 'pkgver': '7.81.0-1ubuntu1.23', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '22.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '7.81.0-1ubuntu1.23', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '24.04', 'pkgname': 'curl', 'pkgver': '8.5.0-2ubuntu10.8', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '24.04', 'pkgname': 'libcurl3t64-gnutls', 'pkgver': '8.5.0-2ubuntu10.8', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '24.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '8.5.0-2ubuntu10.8', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '24.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '8.5.0-2ubuntu10.8', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '24.04', 'pkgname': 'libcurl4t64', 'pkgver': '8.5.0-2ubuntu10.8', 'cves': ['CVE-2025-0167', 'CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784']},
    {'osver': '25.10', 'pkgname': 'curl', 'pkgver': '8.14.1-2ubuntu1.2', 'cves': ['CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784', 'CVE-2026-3805']},
    {'osver': '25.10', 'pkgname': 'libcurl3t64-gnutls', 'pkgver': '8.14.1-2ubuntu1.2', 'cves': ['CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784', 'CVE-2026-3805']},
    {'osver': '25.10', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '8.14.1-2ubuntu1.2', 'cves': ['CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784', 'CVE-2026-3805']},
    {'osver': '25.10', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '8.14.1-2ubuntu1.2', 'cves': ['CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784', 'CVE-2026-3805']},
    {'osver': '25.10', 'pkgname': 'libcurl4t64', 'pkgver': '8.14.1-2ubuntu1.2', 'cves': ['CVE-2026-1965', 'CVE-2026-3783', 'CVE-2026-3784', 'CVE-2026-3805']}
];

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_WARNING,
    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, 'curl / libcurl3-gnutls / libcurl3-nss / libcurl3t64-gnutls / etc');
}