NewStart CGSL MAIN 6.06 : grub2 Multiple Vulnerabilities (NS-SA-2025-0221)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2025-0221. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(266249);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/01");

  script_cve_id(
    "CVE-2014-4607",
    "CVE-2015-8370",
    "CVE-2019-14865",
    "CVE-2020-10713",
    "CVE-2020-14308",
    "CVE-2020-14309",
    "CVE-2020-14310",
    "CVE-2020-14311",
    "CVE-2020-15705"
  );
  script_xref(name:"CEA-ID", value:"CEA-2020-0061");

  script_name(english:"NewStart CGSL MAIN 6.06 : grub2 Multiple Vulnerabilities (NS-SA-2025-0221)");

  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 6.06, has grub2 packages installed that are affected by multiple
vulnerabilities:

  - Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass
    authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace
    characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get
    function in lib/crypto.c, which trigger an Off-by-two or Out of bounds overwrite memory error.
    (CVE-2015-8370)

  - Integer overflow in the LZO algorithm variant in Oberhumer liblzo2 and lzo-2 before 2.07 on 32-bit
    platforms might allow remote attackers to execute arbitrary code via a crafted Literal Run.
    (CVE-2014-4607)

  - A flaw was found in the grub2-set-bootflag utility of grub2. A local attacker could run this utility under
    resource pressure (for example by setting RLIMIT), causing grub2 configuration files to be truncated and
    leaving the system unbootable on subsequent reboots. (CVE-2019-14865)

  - A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper
    the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to
    load an untrusted or modified kernel, an attacker would first need to establish access to the system such
    as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a
    networked system with root access. With this access, an attacker could then craft a string to cause a
    buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The
    highest threat from this vulnerability is to data confidentiality and integrity as well as system
    availability. (CVE-2020-10713)

  - In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on
    the requested allocation size. This leads the function to return invalid memory allocations which can be
    further used to cause possible integrity, confidentiality and availability impacts during the boot
    process. (CVE-2020-14308)

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://security.gd-linux.com/notice/NS-SA-2025-0221");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2014-4607");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2015-8370");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2019-14865");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-10713");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-14308");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-14309");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-14310");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-14311");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2020-15705");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL grub2 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:M/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:L/PR:N/UI:R/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-2015-8370");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2014-4607");

  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:"2014/06/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/09/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-efi-x64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-efi-x64-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-pc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-pc-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-tools-efi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-tools-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:grub2-tools-minimal");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:zte:cgsl_main:6");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");

  exit(0);
}

include('rpm2.inc');

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

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

if (os_release !~ "CGSL\sMAIN\s6\.06")
  audit(AUDIT_OS_NOT, 'NewStart CGSL MAIN 6.06');

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 6.06': [
    'grub2-common-2.02-123.0.2.zncgsl6_6.8.t1.0',
    'grub2-efi-x64-2.02-123.0.2.zncgsl6_6.8.t1.0',
    'grub2-efi-x64-modules-2.02-123.0.2.zncgsl6_6.8.t1.0',
    'grub2-pc-2.02-123.0.2.zncgsl6_6.8.t1.0',
    'grub2-pc-modules-2.02-123.0.2.zncgsl6_6.8.t1.0',
    'grub2-tools-2.02-123.0.2.zncgsl6_6.8.t1.0',
    'grub2-tools-efi-2.02-123.0.2.zncgsl6_6.8.t1.0',
    'grub2-tools-extra-2.02-123.0.2.zncgsl6_6.8.t1.0',
    'grub2-tools-minimal-2.02-123.0.2.zncgsl6_6.8.t1.0'
  ]
};
var pkg_list = pkgs[os_release];
var pkg;
foreach (pkg in pkg_list)
  if (rpm_check(reference:pkg, release:'ZTE ' + os_release, rpm_spec_vers_cmp:TRUE)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, 'grub2');
}