Unity Linux 20.1070e Security Update: kernel (UTSA-2025-990870)

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

include('compat.inc');

if (description)
{
  script_id(275007);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/12");

  script_cve_id("CVE-2024-38578");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-990870)");

  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-2025-990870 advisory.

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

    ecryptfs: Fix buffer size for tag 66 packet

    The 'TAG 66 Packet Format' description is missing the cipher code and
    checksum fields that are packed into the message packet. As a result,
    the buffer allocated for the packet is 3 bytes too small and
    write_tag_66_packet() will write up to 3 bytes past the end of the
    buffer.

    Fix this by increasing the size of the allocation so the whole packet
    will always fit in the buffer.

    This fixes the below kasan slab-out-of-bounds bug:

      BUG: KASAN: slab-out-of-bounds in ecryptfs_generate_key_packet_set+0x7d6/0xde0
      Write of size 1 at addr ffff88800afbb2a5 by task touch/181

      CPU: 0 PID: 181 Comm: touch Not tainted 6.6.13-gnu #1 4c9534092be820851bb687b82d1f92a426598dc6
      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2/GNU Guix 04/01/2014
      Call Trace:
       <TASK>
       dump_stack_lvl+0x4c/0x70
       print_report+0xc5/0x610
       ? ecryptfs_generate_key_packet_set+0x7d6/0xde0
       ? kasan_complete_mode_report_info+0x44/0x210
       ? ecryptfs_generate_key_packet_set+0x7d6/0xde0
       kasan_report+0xc2/0x110
       ? ecryptfs_generate_key_packet_set+0x7d6/0xde0
       __asan_store1+0x62/0x80
       ecryptfs_generate_key_packet_set+0x7d6/0xde0
       ? __pfx_ecryptfs_generate_key_packet_set+0x10/0x10
       ? __alloc_pages+0x2e2/0x540
       ? __pfx_ovl_open+0x10/0x10 [overlay 30837f11141636a8e1793533a02e6e2e885dad1d]
       ? dentry_open+0x8f/0xd0
       ecryptfs_write_metadata+0x30a/0x550
       ? __pfx_ecryptfs_write_metadata+0x10/0x10
       ? ecryptfs_get_lower_file+0x6b/0x190
       ecryptfs_initialize_file+0x77/0x150
       ecryptfs_create+0x1c2/0x2f0
       path_openat+0x17cf/0x1ba0
       ? __pfx_path_openat+0x10/0x10
       do_filp_open+0x15e/0x290
       ? __pfx_do_filp_open+0x10/0x10
       ? __kasan_check_write+0x18/0x30
       ? _raw_spin_lock+0x86/0xf0
       ? __pfx__raw_spin_lock+0x10/0x10
       ? __kasan_check_write+0x18/0x30
       ? alloc_fd+0xf4/0x330
       do_sys_openat2+0x122/0x160
       ? __pfx_do_sys_openat2+0x10/0x10
       __x64_sys_openat+0xef/0x170
       ? __pfx___x64_sys_openat+0x10/0x10
       do_syscall_64+0x60/0xd0
       entry_SYSCALL_64_after_hwframe+0x6e/0xd8
      RIP: 0033:0x7f00a703fd67
      Code: 25 00 00 41 00 3d 00 00 41 00 74 37 64 8b 04 25 18 00 00 00 85 c0 75 5b 44 89 e2 48 89 ee bf 9c ff
    ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f
      RSP: 002b:00007ffc088e30b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
      RAX: ffffffffffffffda RBX: 00007ffc088e3368 RCX: 00007f00a703fd67
      RDX: 0000000000000941 RSI: 00007ffc088e48d7 RDI: 00000000ffffff9c
      RBP: 00007ffc088e48d7 R08: 0000000000000001 R09: 0000000000000000
      R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000941
      R13: 0000000000000000 R14: 00007ffc088e48d7 R15: 00007f00a7180040
       </TASK>

      Allocated by task 181:
       kasan_save_stack+0x2f/0x60
       kasan_set_track+0x29/0x40
       kasan_save_alloc_info+0x25/0x40
       __kasan_kmalloc+0xc5/0xd0
       __kmalloc+0x66/0x160
       ecryptfs_generate_key_packet_set+0x6d2/0xde0
       ecryptfs_write_metadata+0x30a/0x550
       ecryptfs_initialize_file+0x77/0x150
       ecryptfs_create+0x1c2/0x2f0
       path_openat+0x17cf/0x1ba0
       do_filp_open+0x15e/0x290
       do_sys_openat2+0x122/0x160
       __x64_sys_openat+0xef/0x170
       do_syscall_64+0x60/0xd0
       entry_SYSCALL_64_after_hwframe+0x6e/0xd8

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-2025-990870
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8ec86fb1");
  # https://lore.kernel.org/linux-cve-announce/2024061947-CVE-2024-38578-6bf2@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a7105914");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-38578");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/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:H/I:H/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-2024-38578");

  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:"2024/04/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/12");

  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');
}