Ubuntu 22.04 LTS : nginx vulnerability (USN-5371-2)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5371-2. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(160309);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id("CVE-2021-3618");
  script_xref(name:"USN", value:"5371-2");

  script_name(english:"Ubuntu 22.04 LTS : nginx vulnerability (USN-5371-2)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 22.04 LTS host has packages installed that are affected by a vulnerability as referenced in the
USN-5371-2 advisory.

    USN-5371-1 fixed several vulnerabilities in nginx. This update provides the fix for CVE-2021-3618 for
    Ubuntu 22.04 LTS.

    Original advisory details:

    It was discovered that nginx Lua module mishandled certain inputs.

    An attacker could possibly use this issue to perform an HTTP Request

    Smuggling attack. This issue was fixed for Ubuntu 18.04 LTS and

    Ubuntu 20.04 LTS. (CVE-2020-11724)

    It was discovered that nginx Lua module mishandled certain inputs.

    An attacker could possibly use this issue to disclose sensitive

    information. This issue only affects Ubuntu 18.04 LTS and

    Ubuntu 20.04 LTS. (CVE-2020-36309)

    It was discovered that nginx mishandled the use of

    compatible certificates among multiple encryption protocols.

    If a remote attacker were able to intercept the communication,

    this issue could be used to redirect traffic between subdomains.

    (CVE-2021-3618)

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-5371-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/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:H/PR:N/UI:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3618");

  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:"2021/10/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/04/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/04/28");

  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:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-auth-pam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-cache-purge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-dav-ext");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-echo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-fancyindex");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-geoip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-geoip2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-headers-more-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-image-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-ndk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-subs-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-uploadprogress");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-upstream-fair");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-xslt-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-mail");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-nchan");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-rtmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream-geoip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream-geoip2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-extras");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-full");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-light");
  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) 2022-2024 Canonical, Inc. / NASL script (C) 2022-2024 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 (! ('22.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 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': '22.04', 'pkgname': 'libnginx-mod-http-auth-pam', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-cache-purge', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-dav-ext', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-echo', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-fancyindex', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-geoip', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-geoip2', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-headers-more-filter', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-image-filter', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-ndk', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-perl', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-subs-filter', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-uploadprogress', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-upstream-fair', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-xslt-filter', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-mail', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-nchan', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-rtmp', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-stream', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-stream-geoip', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-stream-geoip2', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'nginx', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'nginx-common', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'nginx-core', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'nginx-extras', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'nginx-full', 'pkgver': '1.18.0-6ubuntu14.1'},
    {'osver': '22.04', 'pkgname': 'nginx-light', 'pkgver': '1.18.0-6ubuntu14.1'}
];

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 (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) 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, 'libnginx-mod-http-auth-pam / libnginx-mod-http-cache-purge / etc');
}