Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989583)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(272800);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2023-52750");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989583)");

  script_set_attribute(attribute:"synopsis", value:
"The Unity Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the
UTSA-2025-989583 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    arm64: Restrict CPU_BIG_ENDIAN to GNU as or LLVM IAS 15.x or newer

    Prior to LLVM 15.0.0, LLVM's integrated assembler would incorrectly
    byte-swap NOP when compiling for big-endian, and the resulting series of
    bytes happened to match the encoding of FNMADD S21, S30, S0, S0.

    This went unnoticed until commit:

      34f66c4c4d5518c1 (arm64: Use a positive cpucap for FP/SIMD)

    Prior to that commit, the kernel would always enable the use of FPSIMD
    early in boot when __cpu_setup() initialized CPACR_EL1, and so usage of
    FNMADD within the kernel was not detected, but could result in the
    corruption of user or kernel FPSIMD state.

    After that commit, the instructions happen to trap during boot prior to
    FPSIMD being detected and enabled, e.g.

    | Unhandled 64-bit el1h sync exception on CPU0, ESR 0x000000001fe00000 -- ASIMD
    | CPU: 0 PID: 0 Comm: swapper Not tainted 6.6.0-rc3-00013-g34f66c4c4d55 #1
    | Hardware name: linux,dummy-virt (DT)
    | pstate: 400000c9 (nZcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    | pc : __pi_strcmp+0x1c/0x150
    | lr : populate_properties+0xe4/0x254
    | sp : ffffd014173d3ad0
    | x29: ffffd014173d3af0 x28: fffffbfffddffcb8 x27: 0000000000000000
    | x26: 0000000000000058 x25: fffffbfffddfe054 x24: 0000000000000008
    | x23: fffffbfffddfe000 x22: fffffbfffddfe000 x21: fffffbfffddfe044
    | x20: ffffd014173d3b70 x19: 0000000000000001 x18: 0000000000000005
    | x17: 0000000000000010 x16: 0000000000000000 x15: 00000000413e7000
    | x14: 0000000000000000 x13: 0000000000001bcc x12: 0000000000000000
    | x11: 00000000d00dfeed x10: ffffd414193f2cd0 x9 : 0000000000000000
    | x8 : 0101010101010101 x7 : ffffffffffffffc0 x6 : 0000000000000000
    | x5 : 0000000000000000 x4 : 0101010101010101 x3 : 000000000000002a
    | x2 : 0000000000000001 x1 : ffffd014171f2988 x0 : fffffbfffddffcb8
    | Kernel panic - not syncing: Unhandled exception
    | CPU: 0 PID: 0 Comm: swapper Not tainted 6.6.0-rc3-00013-g34f66c4c4d55 #1
    | Hardware name: linux,dummy-virt (DT)
    | Call trace:
    |  dump_backtrace+0xec/0x108
    |  show_stack+0x18/0x2c
    |  dump_stack_lvl+0x50/0x68
    |  dump_stack+0x18/0x24
    |  panic+0x13c/0x340
    |  el1t_64_irq_handler+0x0/0x1c
    |  el1_abort+0x0/0x5c
    |  el1h_64_sync+0x64/0x68
    |  __pi_strcmp+0x1c/0x150
    |  unflatten_dt_nodes+0x1e8/0x2d8
    |  __unflatten_device_tree+0x5c/0x15c
    |  unflatten_device_tree+0x38/0x50
    |  setup_arch+0x164/0x1e0
    |  start_kernel+0x64/0x38c
    |  __primary_switched+0xbc/0xc4

    Restrict CONFIG_CPU_BIG_ENDIAN to a known good assembler, which is
    either GNU as or LLVM's IAS 15.0.0 and newer, which contains the linked
    commit.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://src.uniontech.com/#/security_advisory_detail?utsa_id=UTSA-2025-989583
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9d4304a6");
  # https://lore.kernel.org/linux-cve-announce/2024052144-CVE-2023-52750-2115@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3b0b0bda");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-52750");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-52750");

  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:"2024/01/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Unity Linux 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/UOS-Server/release", "Host/UOS-Server/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_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'UOS Server' >!< os_product) audit(AUDIT_OS_NOT, 'UOS Server');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'UOS Server');
if (! preg(pattern:"^20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1070e', 'UOS Server ' + os_version);

if (!get_kb_item('Host/UOS-Server/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && 'amd64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) 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, 'kernel');
}