NewStart CGSL MAIN 6.02 : trousers Multiple Vulnerabilities (NS-SA-2022-0066)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2022-0066. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(160732);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/30");

  script_cve_id("CVE-2020-24330", "CVE-2020-24331", "CVE-2020-24332");
  script_xref(name:"IAVA", value:"2020-A-0453");

  script_name(english:"NewStart CGSL MAIN 6.02 : trousers Multiple Vulnerabilities (NS-SA-2022-0066)");

  script_set_attribute(attribute:"synopsis", value:
"The remote NewStart CGSL host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version MAIN 6.02, has trousers packages installed that are affected by multiple
vulnerabilities:

  - An issue was discovered in TrouSerS through 0.3.14. If the tcsd daemon is started with root privileges
    instead of by the tss user, it fails to drop the root gid privilege when no longer needed.
    (CVE-2020-24330)

  - An issue was discovered in TrouSerS through 0.3.14. If the tcsd daemon is started with root privileges,
    the tss user still has read and write access to the /etc/tcsd.conf file (which contains various settings
    related to this daemon). (CVE-2020-24331)

  - An issue was discovered in TrouSerS through 0.3.14. If the tcsd daemon is started with root privileges,
    the creation of the system.data file is prone to symlink attacks. The tss user can be used to create or
    corrupt existing files, which could possibly lead to a DoS attack. (CVE-2020-24332)

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:"http://security.gd-linux.com/notice/NS-SA-2022-0066");
  script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2020-24330");
  script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2020-24331");
  script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/info/CVE-2020-24332");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL trousers packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/AC:L/PR:L/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-2020-24331");

  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:"2020/08/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/05/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/05/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:trousers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:trousers-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:trousers-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:trousers-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:trousers-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:trousers-lib-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:trousers-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:zte:cgsl_main:6");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"NewStart CGSL Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");

  exit(0);
}

include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var release = get_kb_item('Host/ZTE-CGSL/release');
if (isnull(release) || release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, 'NewStart Carrier Grade Server Linux');

if (release !~ "CGSL MAIN 6.02")
  audit(AUDIT_OS_NOT, 'NewStart CGSL MAIN 6.02');

if (!get_kb_item('Host/ZTE-CGSL/rpm-list')) 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'NewStart Carrier Grade Server Linux', cpu);

var flag = 0;

var pkgs = {
  'CGSL MAIN 6.02': [
    'trousers-0.3.15-1.el8',
    'trousers-debuginfo-0.3.15-1.el8',
    'trousers-debugsource-0.3.15-1.el8',
    'trousers-devel-0.3.15-1.el8',
    'trousers-lib-0.3.15-1.el8',
    'trousers-lib-debuginfo-0.3.15-1.el8',
    'trousers-static-0.3.15-1.el8'
  ]
};
var pkg_list = pkgs[release];

foreach (pkg in pkg_list)
  if (rpm_check(release:'ZTE ' + release, reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'trousers');
}