Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987302)

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

include('compat.inc');

if (description)
{
  script_id(268327);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2023-52973");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987302)");

  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-2025-987302 advisory.

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

    vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF

    After a call to console_unlock() in vcs_read() the vc_data struct can be
    freed by vc_deallocate(). Because of that, the struct vc_data pointer
    load must be done at the top of while loop in vcs_read() to avoid a UAF
    when vcs_size() is called.

    Syzkaller reported a UAF in vcs_size().

    BUG: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)
    Read of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537

    CPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1
    Hardware name: Red Hat KVM, BIOS 1.15.0-2.module
    Call Trace:
      <TASK>
    __asan_report_load4_noabort (mm/kasan/report_generic.c:350)
    vcs_size (drivers/tty/vt/vc_screen.c:215)
    vcs_read (drivers/tty/vt/vc_screen.c:415)
    vfs_read (fs/read_write.c:468 fs/read_write.c:450)
    ...
      </TASK>

    Allocated by task 1191:
    ...
    kmalloc_trace (mm/slab_common.c:1069)
    vc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720
         drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108)
    con_install (drivers/tty/vt/vt.c:3383)
    tty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413
         drivers/tty/tty_io.c:1390)
    tty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126)
    chrdev_open (fs/char_dev.c:415)
    do_dentry_open (fs/open.c:883)
    vfs_open (fs/open.c:1014)
    ...

    Freed by task 1548:
    ...
    kfree (mm/slab_common.c:1021)
    vc_port_destruct (drivers/tty/vt/vt.c:1094)
    tty_port_destructor (drivers/tty/tty_port.c:296)
    tty_port_put (drivers/tty/tty_port.c:312)
    vt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))
    vt_ioctl (drivers/tty/vt/vt_ioctl.c:903)
    tty_ioctl (drivers/tty/tty_io.c:2776)
    ...

    The buggy address belongs to the object at ffff888113747800
      which belongs to the cache kmalloc-1k of size 1024
    The buggy address is located 424 bytes inside of
      1024-byte region [ffff888113747800, ffff888113747c00)

    The buggy address belongs to the physical page:
    page:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000
         index:0x0 pfn:0x113740
    head:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0
         compound_pincount:0
    anon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)
    raw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001
    raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
    page dumped because: kasan: bad access detected

    Memory state around the buggy address:
      ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
      ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
    > ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                       ^
      ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
      ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
    ==================================================================
    Disabling lock debugging due to kernel taint

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-2025-987302
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e39ab814");
  # https://lore.kernel.org/linux-cve-announce/2025032703-CVE-2023-52973-a993@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3bbe286e");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-52973");
  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: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-2023-52973");

  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:"2024/02/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/07");

  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-5.10.0-74.16', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.16', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.16', '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');
}