Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989355)

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

include('compat.inc');

if (description)
{
  script_id(273485);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2023-52906");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989355)");

  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-2025-989355 advisory.

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

    net/sched: act_mpls: Fix warning during failed attribute validation

    The 'TCA_MPLS_LABEL' attribute is of 'NLA_U32' type, but has a
    validation type of 'NLA_VALIDATE_FUNCTION'. This is an invalid
    combination according to the comment above 'struct nla_policy':

    
    Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN:
       NLA_BINARY           Validation function called for the attribute.
       All other            Unused - but note that it's a union
    

    This can trigger the warning [1] in nla_get_range_unsigned() when
    validation of the attribute fails. Despite being of 'NLA_U32' type, the
    associated 'min'/'max' fields in the policy are negative as they are
    aliased by the 'validate' field.

    Fix by changing the attribute type to 'NLA_BINARY' which is consistent
    with the above comment and all other users of NLA_POLICY_VALIDATE_FN().
    As a result, move the length validation to the validation function.

    No regressions in MPLS tests:

     # ./tdc.py -f tc-tests/actions/mpls.json
     [...]
     # echo $?
     0

    [1]
    WARNING: CPU: 0 PID: 17743 at lib/nlattr.c:118
    nla_get_range_unsigned+0x1d8/0x1e0 lib/nlattr.c:117
    Modules linked in:
    CPU: 0 PID: 17743 Comm: syz-executor.0 Not tainted 6.1.0-rc8 #3
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
    rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014
    RIP: 0010:nla_get_range_unsigned+0x1d8/0x1e0 lib/nlattr.c:117
    [...]
    Call Trace:
     <TASK>
     __netlink_policy_dump_write_attr+0x23d/0x990 net/netlink/policy.c:310
     netlink_policy_dump_write_attr+0x22/0x30 net/netlink/policy.c:411
     netlink_ack_tlv_fill net/netlink/af_netlink.c:2454 [inline]
     netlink_ack+0x546/0x760 net/netlink/af_netlink.c:2506
     netlink_rcv_skb+0x1b7/0x240 net/netlink/af_netlink.c:2546
     rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6109
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x5e9/0x6b0 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x739/0x860 net/netlink/af_netlink.c:1921
     sock_sendmsg_nosec net/socket.c:714 [inline]
     sock_sendmsg net/socket.c:734 [inline]
     ____sys_sendmsg+0x38f/0x500 net/socket.c:2482
     ___sys_sendmsg net/socket.c:2536 [inline]
     __sys_sendmsg+0x197/0x230 net/socket.c:2565
     __do_sys_sendmsg net/socket.c:2574 [inline]
     __se_sys_sendmsg net/socket.c:2572 [inline]
     __x64_sys_sendmsg+0x42/0x50 net/socket.c:2572
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x63/0xcd

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-2025-989355
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?17cfcc4d");
  # https://lore.kernel.org/linux-cve-announce/2024082114-CVE-2023-52906-7967@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c40d9b6d");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-52906");
  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-2023-52906");

  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:"2023/02/08");
  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:"^20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 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': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}