Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : curl vulnerabilities (USN-8820-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8820-1. 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(350699);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/25");
  script_xref(name:"USN", value:"8820-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : curl vulnerabilities (USN-8820-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that
are affected by a vulnerability as referenced in the USN-8820-1 advisory.

    Eunsoo Kim discovered that curl incorrectly handled SASL negotiation for LDAP authentication in certain
    circumstances. A machine-in-the-middle attacker could possibly use this issue to bypass peer validation.
    This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-13608)

    Stephan Zeisberg discovered that curl incorrectly handled HTTP/2 Server Push streams when sharing
    connections between handles. A remote attacker could possibly use this issue to cause curl to crash,
    resulting in a denial of service, or execute arbitrary code. (CVE-2026-18924)

    Stanislav Fort discovered that curl incorrectly managed the lifetime of pooled TLS connections when using
    the multi interface. An attacker could possibly use this issue to cause curl to crash, resulting in a
    denial of service, or execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-80229)

    Stanislav Fort discovered that curl did not properly enforce public key pinning when certificate
    verification was disabled in certain circumstances. A remote attacker could possibly use this issue to
    bypass pinning checks and cause curl to accept connections that should have been rejected.
    (CVE-2026-80230)

    Stanislav Fort discovered that curl incorrectly handled the Secure attribute of cookies in certain
    circumstances. A remote attacker could possibly use this issue to obtain sensitive information. This issue
    only affected Ubuntu 26.04 LTS. (CVE-2026-80255)

    Stanislav Fort discovered that curl did not properly enforce Public Suffix List boundaries when handling
    cookies in certain circumstances. A remote attacker could possibly use this issue to cause cookies to be
    sent to unrelated domains, resulting in sensitive information being exposed. This issue only affected
    Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.
    (CVE-2026-82209)

    Ady Elouej discovered that curl did not clear proxy authentication state between requests when reusing a
    handle with environment-variable proxy configuration. A remote attacker could possibly use this issue to
    obtain sensitive credentials. This issue was previously fixed in USN-8487-1, but that fix was incomplete
    for Ubuntu 16.04 LTS. (CVE-2026-8927)

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

Note that Nessus has not tested for this issue 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-8820-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_attribute(attribute:"risk_factor", value:"Medium");

  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:"2026/09/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  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:curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl3");
  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:libcurl4t64");
  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 (! ('16.04' >< os_release || '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 16.04 / 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 pkgs = [
    {'osver': '16.04', 'pkgname': 'curl', 'pkgver': '7.47.0-1ubuntu2.19+esm20', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230']},
    {'osver': '16.04', 'pkgname': 'libcurl3', 'pkgver': '7.47.0-1ubuntu2.19+esm20', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230']},
    {'osver': '16.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.47.0-1ubuntu2.19+esm20', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230']},
    {'osver': '16.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.47.0-1ubuntu2.19+esm20', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230']},
    {'osver': '18.04', 'pkgname': 'curl', 'pkgver': '7.58.0-2ubuntu3.24+esm14', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '18.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.58.0-2ubuntu3.24+esm14', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '18.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.58.0-2ubuntu3.24+esm14', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '18.04', 'pkgname': 'libcurl4', 'pkgver': '7.58.0-2ubuntu3.24+esm14', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '20.04', 'pkgname': 'curl', 'pkgver': '7.68.0-1ubuntu2.25+esm9', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '20.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.68.0-1ubuntu2.25+esm9', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '20.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.68.0-1ubuntu2.25+esm9', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '20.04', 'pkgname': 'libcurl4', 'pkgver': '7.68.0-1ubuntu2.25+esm9', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '22.04', 'pkgname': 'curl', 'pkgver': '7.81.0-1ubuntu1.29', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '22.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.81.0-1ubuntu1.29', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '22.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.81.0-1ubuntu1.29', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '22.04', 'pkgname': 'libcurl4', 'pkgver': '7.81.0-1ubuntu1.29', 'cves': ['CVE-2026-8927', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '24.04', 'pkgname': 'curl', 'pkgver': '8.5.0-2ubuntu10.15', 'cves': ['CVE-2026-8927', 'CVE-2026-13608', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '24.04', 'pkgname': 'libcurl3t64-gnutls', 'pkgver': '8.5.0-2ubuntu10.15', 'cves': ['CVE-2026-8927', 'CVE-2026-13608', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '24.04', 'pkgname': 'libcurl4t64', 'pkgver': '8.5.0-2ubuntu10.15', 'cves': ['CVE-2026-8927', 'CVE-2026-13608', 'CVE-2026-18924', 'CVE-2026-80230', 'CVE-2026-82209']},
    {'osver': '26.04', 'pkgname': 'curl', 'pkgver': '8.18.0-1ubuntu2.7', 'cves': ['CVE-2026-8927', 'CVE-2026-13608', 'CVE-2026-18924', 'CVE-2026-80229', 'CVE-2026-80230', 'CVE-2026-80255', 'CVE-2026-82209']},
    {'osver': '26.04', 'pkgname': 'libcurl3t64-gnutls', 'pkgver': '8.18.0-1ubuntu2.7', 'cves': ['CVE-2026-8927', 'CVE-2026-13608', 'CVE-2026-18924', 'CVE-2026-80229', 'CVE-2026-80230', 'CVE-2026-80255', 'CVE-2026-82209']},
    {'osver': '26.04', 'pkgname': 'libcurl4t64', 'pkgver': '8.18.0-1ubuntu2.7', 'cves': ['CVE-2026-8927', 'CVE-2026-13608', 'CVE-2026-18924', 'CVE-2026-80229', 'CVE-2026-80230', 'CVE-2026-80255', 'CVE-2026-82209']}
];

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 / libcurl3-gnutls / libcurl3-nss / etc');
}