Ubuntu 20.04 LTS / 22.04 LTS / 23.10 : curl vulnerabilities (USN-6718-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6718-1. 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(192621);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/29");

  script_cve_id("CVE-2024-2004", "CVE-2024-2398");
  script_xref(name:"USN", value:"6718-1");
  script_xref(name:"IAVA", value:"2024-A-0185");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.10 : curl vulnerabilities (USN-6718-1)");

  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 20.04 LTS / 22.04 LTS / 23.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6718-1 advisory.

  - When a protocol selection parameter option disables all protocols without adding any then the default set
    of protocols would remain in the allowed set due to an error in the logic for removing protocols. The
    below command would perform a request to curl.se with a plaintext protocol which has been explicitly
    disabled. curl --proto -all,-http http://curl.se The flaw is only present if the set of selected protocols
    disables the entire set of available protocols, in itself a command with no practical use and therefore
    unlikely to be encountered in real situations. The curl security team has thus assessed this to be low
    severity bug. (CVE-2024-2004)

  - When an application tells libcurl it wants to allow HTTP/2 server push, and the amount of received headers
    for the push surpasses the maximum allowed limit (1000), libcurl aborts the server push. When aborting,
    libcurl inadvertently does not free all the previously allocated headers and instead leaks the memory.
    Further, this error condition fails silently and is therefore not easily detected by an application.
    (CVE-2024-2398)

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-6718-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-2398");

  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:"2024/03/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/03/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/03/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:23.10");
  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: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:"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) 2024 Canonical, Inc. / NASL script (C) 2024 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 (! ('20.04' >< os_release || '22.04' >< os_release || '23.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 23.10', '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': '20.04', 'pkgname': 'curl', 'pkgver': '7.68.0-1ubuntu2.22'},
    {'osver': '20.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.68.0-1ubuntu2.22'},
    {'osver': '20.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.68.0-1ubuntu2.22'},
    {'osver': '20.04', 'pkgname': 'libcurl4', 'pkgver': '7.68.0-1ubuntu2.22'},
    {'osver': '20.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '7.68.0-1ubuntu2.22'},
    {'osver': '20.04', 'pkgname': 'libcurl4-nss-dev', 'pkgver': '7.68.0-1ubuntu2.22'},
    {'osver': '20.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '7.68.0-1ubuntu2.22'},
    {'osver': '22.04', 'pkgname': 'curl', 'pkgver': '7.81.0-1ubuntu1.16'},
    {'osver': '22.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.81.0-1ubuntu1.16'},
    {'osver': '22.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.81.0-1ubuntu1.16'},
    {'osver': '22.04', 'pkgname': 'libcurl4', 'pkgver': '7.81.0-1ubuntu1.16'},
    {'osver': '22.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '7.81.0-1ubuntu1.16'},
    {'osver': '22.04', 'pkgname': 'libcurl4-nss-dev', 'pkgver': '7.81.0-1ubuntu1.16'},
    {'osver': '22.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '7.81.0-1ubuntu1.16'},
    {'osver': '23.10', 'pkgname': 'curl', 'pkgver': '8.2.1-1ubuntu3.3'},
    {'osver': '23.10', 'pkgname': 'libcurl3-gnutls', 'pkgver': '8.2.1-1ubuntu3.3'},
    {'osver': '23.10', 'pkgname': 'libcurl3-nss', 'pkgver': '8.2.1-1ubuntu3.3'},
    {'osver': '23.10', 'pkgname': 'libcurl4', 'pkgver': '8.2.1-1ubuntu3.3'},
    {'osver': '23.10', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '8.2.1-1ubuntu3.3'},
    {'osver': '23.10', 'pkgname': 'libcurl4-nss-dev', 'pkgver': '8.2.1-1ubuntu3.3'},
    {'osver': '23.10', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '8.2.1-1ubuntu3.3'}
];

var flag = 0;
foreach 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 (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  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 / libcurl4 / etc');
}