SUSE SLES15 Security Update : kernel (Live Patch 2 for SLE 15 SP5) (SUSE-SU-2023:3924-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2023:3924-1. The text itself
# is copyright (C) SUSE.
##

include('compat.inc');

if (description)
{
  script_id(182490);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/02");

  script_cve_id("CVE-2023-3609", "CVE-2023-3776", "CVE-2023-4273");
  script_xref(name:"SuSE", value:"SUSE-SU-2023:3924-1");

  script_name(english:"SUSE SLES15 Security Update : kernel (Live Patch 2 for SLE 15 SP5) (SUSE-SU-2023:3924-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote SUSE Linux SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in
the SUSE-SU-2023:3924-1 advisory.

  - A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to
    achieve local privilege escalation. If tcf_change_indev() fails, u32_set_parms() will immediately return
    an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can
    control the reference counter and set it to zero, they can cause the reference to be freed, leading to a
    use-after-free vulnerability. We recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.
    (CVE-2023-3609)

  - A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to
    achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an
    error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can
    control the reference counter and set it to zero, they can cause the reference to be freed, leading to a
    use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.
    (CVE-2023-3776)

  - A flaw was found in the exFAT driver of the Linux kernel. The vulnerability exists in the implementation
    of the file name reconstruction function, which is responsible for reading file name entries from a
    directory index and merging file name parts belonging to one file into a single long file name. Since the
    file name characters are copied into a stack variable, a local privileged attacker could use this flaw to
    overflow the kernel stack. (CVE-2023-4273)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1213587");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1214123");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1215119");
  # https://lists.suse.com/pipermail/sle-security-updates/2023-October/016471.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c50e464b");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2023-3609");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2023-3776");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2023-4273");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel-livepatch-5_14_21-150500_55_12-default 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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-3776");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/09/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-livepatch-5_14_21-150500_55_12-default");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:15");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"SuSE Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item("Host/SuSE/release");
if (isnull(os_release) || os_release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
var os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES15)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES15', 'SUSE (' + os_ver + ')');

var uname_r = get_kb_item("Host/uname-r");
if (empty_or_null(uname_r)) audit(AUDIT_UNKNOWN_APP_VER, "kernel");

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'SUSE (' + os_ver + ')', cpu);

var service_pack = get_kb_item("Host/SuSE/patchlevel");
if (isnull(service_pack)) service_pack = "0";
if (os_ver == "SLES15" && (! preg(pattern:"^(5)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES15 SP5", os_ver + " SP" + service_pack);

var kernel_live_checks = [
  {
    'kernels': {
      '5.14.21-150500.55.12-default': {
        'pkgs': [
          {'reference':'kernel-livepatch-5_14_21-150500_55_12-default-3-150500.2.1', 'sp':'5', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sle-module-live-patching-release-15.5']}
        ]
      }
    }
  }
];

var ltss_caveat_required = FALSE;
var flag = 0;
var kernel_affected = FALSE;
foreach var kernel_array ( kernel_live_checks ) {
  var kpatch_details = kernel_array['kernels'][uname_r];
  if (empty_or_null(kpatch_details)) continue;
  kernel_affected = TRUE;
  foreach var package_array ( kpatch_details['pkgs'] ) {
    var reference = NULL;
    var _release = NULL;
    var sp = NULL;
    var _cpu = NULL;
    var exists_check = NULL;
    var rpm_spec_vers_cmp = NULL;
    if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
    if (!empty_or_null(package_array['release'])) _release = package_array['release'];
    if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
    if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
    if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
    if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
    if (reference && _release) {
      if (exists_check) {
        var check_flag = 0;
        foreach var check (exists_check) {
          if (!rpm_exists(release:_release, rpm:check)) continue;
          check_flag++;
        }
        if (!check_flag) continue;
      }
    }
    if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
  }
}

# No kpatch details found for the running kernel version
if (!kernel_affected) audit(AUDIT_INST_VER_NOT_VULN, 'kernel', uname_r);

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-livepatch-5_14_21-150500_55_12-default');
}