Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992867)

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

include('compat.inc');

if (description)
{
  script_id(281431);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/31");

  script_cve_id("CVE-2022-49763");

  script_name(english:"Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992867)");

  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-2025-992867 advisory.

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

    ntfs: fix use-after-free in ntfs_attr_find()

    Patch series ntfs: fix bugs about Attribute, v2.

    This patchset fixes three bugs relative to Attribute in record:

    Patch 1 adds a sanity check to ensure that, attrs_offset field in first
    mft record loading from disk is within bounds.

    Patch 2 moves the ATTR_RECORD's bounds checking earlier, to avoid
    dereferencing ATTR_RECORD before checking this ATTR_RECORD is within
    bounds.

    Patch 3 adds an overflow checking to avoid possible forever loop in
    ntfs_attr_find().

    Without patch 1 and patch 2, the kernel triggersa KASAN use-after-free
    detection as reported by Syzkaller.

    Although one of patch 1 or patch 2 can fix this, we still need both of
    them.  Because patch 1 fixes the root cause, and patch 2 not only fixes
    the direct cause, but also fixes the potential out-of-bounds bug.


    This patch (of 3):

    Syzkaller reported use-after-free read as follows:
    ==================================================================
    BUG: KASAN: use-after-free in ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597
    Read of size 2 at addr ffff88807e352009 by task syz-executor153/3607

    [...]
    Call Trace:
     <TASK>
     __dump_stack lib/dump_stack.c:88 [inline]
     dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
     print_address_description mm/kasan/report.c:317 [inline]
     print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
     kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
     ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597
     ntfs_attr_lookup+0x1056/0x2070 fs/ntfs/attrib.c:1193
     ntfs_read_inode_mount+0x89a/0x2580 fs/ntfs/inode.c:1845
     ntfs_fill_super+0x1799/0x9320 fs/ntfs/super.c:2854
     mount_bdev+0x34d/0x410 fs/super.c:1400
     legacy_get_tree+0x105/0x220 fs/fs_context.c:610
     vfs_get_tree+0x89/0x2f0 fs/super.c:1530
     do_new_mount fs/namespace.c:3040 [inline]
     path_mount+0x1326/0x1e20 fs/namespace.c:3370
     do_mount fs/namespace.c:3383 [inline]
     __do_sys_mount fs/namespace.c:3591 [inline]
     __se_sys_mount fs/namespace.c:3568 [inline]
     __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x63/0xcd
     [...]
     </TASK>

    The buggy address belongs to the physical page:
    page:ffffea0001f8d400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e350
    head:ffffea0001f8d400 order:3 compound_mapcount:0 compound_pincount:0
    flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
    raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011842140
    raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
    page dumped because: kasan: bad access detected
    Memory state around the buggy address:
     ffff88807e351f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
     ffff88807e351f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
    >ffff88807e352000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                          ^
     ffff88807e352080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
     ffff88807e352100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
    ==================================================================

    Kernel will loads $MFT/$DATA's first mft record in
    ntfs_read_inode_mount().

    Yet the problem is that after loading, kernel doesn't check whether
    attrs_offset field is a valid value.

    To be more specific, if attrs_offset field is larger than bytes_allocated
    field, then it may trigger the out-of-bounds read bug(reported as
    use-after-free bug) in ntfs_attr_find(), when kernel tries to access the
    corresponding mft record's attribute.

    This patch solves it by adding the sanity check between attrs_offset field
    and bytes_allocated field, after loading the first mft record.

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-2025-992867
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b5202d5a");
  # https://lore.kernel.org/linux-cve-announce/2025050113-CVE-2022-49763-3556@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3d544f3a");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49763");
  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-2022-49763");

  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:"2022/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/31");

  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:"^20.1060a|20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060a / 20.1070a', '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 && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1060a',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', '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');
}