Ubuntu 16.04 ESM / 18.04 ESM / 20.04 LTS / 22.04 LTS / 23.10 : Exim vulnerability (USN-6611-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6611-1. 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(189736);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/02");

  script_cve_id("CVE-2023-51766");
  script_xref(name:"IAVA", value:"2024-A-0002");
  script_xref(name:"USN", value:"6611-1");

  script_name(english:"Ubuntu 16.04 ESM / 18.04 ESM / 20.04 LTS / 22.04 LTS / 23.10 : Exim vulnerability (USN-6611-1)");

  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 ESM / 18.04 ESM / 20.04 LTS / 22.04 LTS / 23.10 host has packages installed that are affected by
a vulnerability as referenced in the USN-6611-1 advisory.

  - Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers
    can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address,
    allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some
    other popular e-mail servers do not. (CVE-2023-51766)

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-6611-1");
  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:P/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:N/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-2023-51766");

  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:"2023/12/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/01/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/01/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:esm");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:esm");
  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:exim4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:exim4-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:exim4-config");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:exim4-daemon-heavy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:exim4-daemon-light");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:exim4-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:eximon4");
  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 (! ('16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '23.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 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': '16.04', 'pkgname': 'exim4', 'pkgver': '4.86.2-2ubuntu2.6+esm6'},
    {'osver': '16.04', 'pkgname': 'exim4-base', 'pkgver': '4.86.2-2ubuntu2.6+esm6'},
    {'osver': '16.04', 'pkgname': 'exim4-config', 'pkgver': '4.86.2-2ubuntu2.6+esm6'},
    {'osver': '16.04', 'pkgname': 'exim4-daemon-heavy', 'pkgver': '4.86.2-2ubuntu2.6+esm6'},
    {'osver': '16.04', 'pkgname': 'exim4-daemon-light', 'pkgver': '4.86.2-2ubuntu2.6+esm6'},
    {'osver': '16.04', 'pkgname': 'exim4-dev', 'pkgver': '4.86.2-2ubuntu2.6+esm6'},
    {'osver': '16.04', 'pkgname': 'eximon4', 'pkgver': '4.86.2-2ubuntu2.6+esm6'},
    {'osver': '18.04', 'pkgname': 'exim4', 'pkgver': '4.90.1-1ubuntu1.10+esm3'},
    {'osver': '18.04', 'pkgname': 'exim4-base', 'pkgver': '4.90.1-1ubuntu1.10+esm3'},
    {'osver': '18.04', 'pkgname': 'exim4-config', 'pkgver': '4.90.1-1ubuntu1.10+esm3'},
    {'osver': '18.04', 'pkgname': 'exim4-daemon-heavy', 'pkgver': '4.90.1-1ubuntu1.10+esm3'},
    {'osver': '18.04', 'pkgname': 'exim4-daemon-light', 'pkgver': '4.90.1-1ubuntu1.10+esm3'},
    {'osver': '18.04', 'pkgname': 'exim4-dev', 'pkgver': '4.90.1-1ubuntu1.10+esm3'},
    {'osver': '18.04', 'pkgname': 'eximon4', 'pkgver': '4.90.1-1ubuntu1.10+esm3'},
    {'osver': '20.04', 'pkgname': 'exim4', 'pkgver': '4.93-13ubuntu1.10'},
    {'osver': '20.04', 'pkgname': 'exim4-base', 'pkgver': '4.93-13ubuntu1.10'},
    {'osver': '20.04', 'pkgname': 'exim4-config', 'pkgver': '4.93-13ubuntu1.10'},
    {'osver': '20.04', 'pkgname': 'exim4-daemon-heavy', 'pkgver': '4.93-13ubuntu1.10'},
    {'osver': '20.04', 'pkgname': 'exim4-daemon-light', 'pkgver': '4.93-13ubuntu1.10'},
    {'osver': '20.04', 'pkgname': 'exim4-dev', 'pkgver': '4.93-13ubuntu1.10'},
    {'osver': '20.04', 'pkgname': 'eximon4', 'pkgver': '4.93-13ubuntu1.10'},
    {'osver': '22.04', 'pkgname': 'exim4', 'pkgver': '4.95-4ubuntu2.5'},
    {'osver': '22.04', 'pkgname': 'exim4-base', 'pkgver': '4.95-4ubuntu2.5'},
    {'osver': '22.04', 'pkgname': 'exim4-config', 'pkgver': '4.95-4ubuntu2.5'},
    {'osver': '22.04', 'pkgname': 'exim4-daemon-heavy', 'pkgver': '4.95-4ubuntu2.5'},
    {'osver': '22.04', 'pkgname': 'exim4-daemon-light', 'pkgver': '4.95-4ubuntu2.5'},
    {'osver': '22.04', 'pkgname': 'exim4-dev', 'pkgver': '4.95-4ubuntu2.5'},
    {'osver': '22.04', 'pkgname': 'eximon4', 'pkgver': '4.95-4ubuntu2.5'},
    {'osver': '23.10', 'pkgname': 'exim4', 'pkgver': '4.96-17ubuntu2.2'},
    {'osver': '23.10', 'pkgname': 'exim4-base', 'pkgver': '4.96-17ubuntu2.2'},
    {'osver': '23.10', 'pkgname': 'exim4-config', 'pkgver': '4.96-17ubuntu2.2'},
    {'osver': '23.10', 'pkgname': 'exim4-daemon-heavy', 'pkgver': '4.96-17ubuntu2.2'},
    {'osver': '23.10', 'pkgname': 'exim4-daemon-light', 'pkgver': '4.96-17ubuntu2.2'},
    {'osver': '23.10', 'pkgname': 'exim4-dev', 'pkgver': '4.96-17ubuntu2.2'},
    {'osver': '23.10', 'pkgname': 'eximon4', 'pkgver': '4.96-17ubuntu2.2'}
];

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, 'exim4 / exim4-base / exim4-config / exim4-daemon-heavy / etc');
}