Ubuntu 20.04 LTS / 22.04 LTS : Puma vulnerabilities (USN-6682-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6682-1. 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(191720);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/07");

  script_cve_id(
    "CVE-2020-11076",
    "CVE-2020-11077",
    "CVE-2022-23634",
    "CVE-2022-24790",
    "CVE-2023-40175",
    "CVE-2024-21647"
  );
  script_xref(name:"USN", value:"6682-1");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS : Puma vulnerabilities (USN-6682-1)");

  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 host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-6682-1 advisory.

  - In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid
    transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4. (CVE-2020-11076)

  - In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the
    proxy to send a response back to another unknown client. If the proxy uses persistent connections and the
    client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body.
    Puma, however, would see it as two requests, and when processing the second request, send back a response
    that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another
    request for a different client, the second response from the first client will be sent to the second
    client. This is a similar but different vulnerability from CVE-2020-11076. The problem has been fixed in
    Puma 3.12.6 and Puma 4.3.5. (CVE-2020-11077)

  - Puma is a Ruby/Rack web server built for parallelism. Prior to `puma` version `5.6.2`, `puma` may not
    always call `close` on the response body. Rails, prior to version `7.0.2.2`, depended on the response body
    being closed in order for its `CurrentAttributes` implementation to work correctly. The combination of
    these two behaviors (Puma not closing the body + Rails' Executor implementation) causes information
    leakage. This problem is fixed in Puma versions 5.6.2 and 4.3.11. This problem is fixed in Rails versions
    7.02.2, 6.1.4.6, 6.0.4.6, and 5.2.6.2. Upgrading to a patched Rails _or_ Puma version fixes the
    vulnerability. (CVE-2022-23634)

  - Puma is a simple, fast, multi-threaded, parallel HTTP 1.1 server for Ruby/Rack applications. When using
    Puma behind a proxy that does not properly validate that the incoming HTTP request matches the RFC7230
    standard, Puma and the frontend proxy may disagree on where a request starts and ends. This would allow
    requests to be smuggled via the front-end proxy to Puma. The vulnerability has been fixed in 5.6.4 and
    4.3.12. Users are advised to upgrade as soon as possible. Workaround: when deploying a proxy in front of
    Puma, turning on any and all functionality to make sure that the request matches the RFC7230 standard.
    (CVE-2022-24790)

  - Puma is a Ruby/Rack web server built for parallelism. Prior to versions 6.3.1 and 5.6.7, puma exhibited
    incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in
    a way that allowed HTTP request smuggling. Severity of this issue is highly dependent on the nature of the
    web site using puma is. This could be caused by either incorrect parsing of trailing fields in chunked
    transfer encoding bodies or by parsing of blank/zero-length Content-Length headers. Both issues have been
    addressed and this vulnerability has been fixed in versions 6.3.1 and 5.6.7. Users are advised to upgrade.
    There are no known workarounds for this vulnerability. (CVE-2023-40175)

  - Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma
    exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP
    request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker
    could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in
    versions 6.4.2 and 5.6.8. (CVE-2024-21647)

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-6682-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected puma package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  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:H/I:H/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-2022-24790");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2023-40175");

  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:"2020/05/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/03/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/03/07");

  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:"p-cpe:/a:canonical:ubuntu_linux:puma");
  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) 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)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04', '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': '20.04', 'pkgname': 'puma', 'pkgver': '3.12.4-1ubuntu2+esm1'},
    {'osver': '22.04', 'pkgname': 'puma', 'pkgver': '5.5.2-2ubuntu2+esm1'}
];

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, 'puma');
}