Ubuntu 22.04 LTS / 23.10 / 24.04 LTS : OpenSSH vulnerability (USN-6859-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6859-1. 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(201211);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/07/01");

  script_cve_id("CVE-2024-6387");
  script_xref(name:"USN", value:"6859-1");

  script_name(english:"Ubuntu 22.04 LTS / 23.10 / 24.04 LTS : OpenSSH vulnerability (USN-6859-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 22.04 LTS / 23.10 / 24.04 LTS host has packages installed that are affected by a vulnerability as
referenced in the USN-6859-1 advisory.

    It was discovered that OpenSSH incorrectly handled signal management. A remote attacker could use this
    issue to bypass authentication and remotely access systems without proper credentials.

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-6859-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-6387");

  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:"2024/07/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/07/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/07/01");

  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:"cpe:/o:canonical:ubuntu_linux:23.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssh-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssh-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssh-sftp-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssh-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ssh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ssh-askpass-gnome");
  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 (! ('22.04' >< os_release || '23.10' >< os_release || '24.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 23.10 / 24.04', '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': 'openssh-client', 'pkgver': '1:8.9p1-3ubuntu0.10'},
    {'osver': '22.04', 'pkgname': 'openssh-server', 'pkgver': '1:8.9p1-3ubuntu0.10'},
    {'osver': '22.04', 'pkgname': 'openssh-sftp-server', 'pkgver': '1:8.9p1-3ubuntu0.10'},
    {'osver': '22.04', 'pkgname': 'openssh-tests', 'pkgver': '1:8.9p1-3ubuntu0.10'},
    {'osver': '22.04', 'pkgname': 'ssh', 'pkgver': '1:8.9p1-3ubuntu0.10'},
    {'osver': '22.04', 'pkgname': 'ssh-askpass-gnome', 'pkgver': '1:8.9p1-3ubuntu0.10'},
    {'osver': '23.10', 'pkgname': 'openssh-client', 'pkgver': '1:9.3p1-1ubuntu3.6'},
    {'osver': '23.10', 'pkgname': 'openssh-server', 'pkgver': '1:9.3p1-1ubuntu3.6'},
    {'osver': '23.10', 'pkgname': 'openssh-sftp-server', 'pkgver': '1:9.3p1-1ubuntu3.6'},
    {'osver': '23.10', 'pkgname': 'openssh-tests', 'pkgver': '1:9.3p1-1ubuntu3.6'},
    {'osver': '23.10', 'pkgname': 'ssh', 'pkgver': '1:9.3p1-1ubuntu3.6'},
    {'osver': '23.10', 'pkgname': 'ssh-askpass-gnome', 'pkgver': '1:9.3p1-1ubuntu3.6'},
    {'osver': '24.04', 'pkgname': 'openssh-client', 'pkgver': '1:9.6p1-3ubuntu13.3'},
    {'osver': '24.04', 'pkgname': 'openssh-server', 'pkgver': '1:9.6p1-3ubuntu13.3'},
    {'osver': '24.04', 'pkgname': 'openssh-sftp-server', 'pkgver': '1:9.6p1-3ubuntu13.3'},
    {'osver': '24.04', 'pkgname': 'openssh-tests', 'pkgver': '1:9.6p1-3ubuntu13.3'},
    {'osver': '24.04', 'pkgname': 'ssh', 'pkgver': '1:9.6p1-3ubuntu13.3'},
    {'osver': '24.04', 'pkgname': 'ssh-askpass-gnome', 'pkgver': '1:9.6p1-3ubuntu13.3'}
];

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_HOLE,
    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, 'openssh-client / openssh-server / openssh-sftp-server / etc');
}