SUSE SLES15 Security Update : kernel (Live Patch 1 for SLE 15 SP3) (SUSE-SU-2021:3742-1)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2021:3742-1. The text itself
# is copyright (C) SUSE.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(155650);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/13");

  script_cve_id("CVE-2021-34866", "CVE-2021-41864");
  script_xref(name:"SuSE", value:"SUSE-SU-2021:3742-1");

  script_name(english:"SUSE SLES15 Security Update : kernel (Live Patch 1 for SLE 15 SP3) (SUSE-SU-2021:3742-1)");

  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 a package installed that is affected by multiple vulnerabilities as referenced in
the SUSE-SU-2021:3742-1 advisory.

  - This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel
    5.14-rc3. An attacker must first obtain the ability to execute low-privileged code on the target system in
    order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The
    issue results from the lack of proper validation of user-supplied eBPF programs, which can result in a
    type confusion condition. An attacker can leverage this vulnerability to escalate privileges and execute
    arbitrary code in the context of the kernel. Was ZDI-CAN-14689. (CVE-2021-34866)

  - prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the Linux kernel before 5.14.12 allows
    unprivileged users to trigger an eBPF multiplication integer overflow with a resultant out-of-bounds
    write. (CVE-2021-41864)

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/1191318");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1191646");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-34866");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-41864");
  # https://lists.suse.com/pipermail/sle-security-updates/2021-November/009753.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?96c1bbf6");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel-livepatch-5_3_18-59_5-default package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/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-2021-34866");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-41864");

  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:"2021/10/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/11/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/11/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-livepatch-5_3_18-59_5-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) 2021-2023 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 + ')');

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:"^(3)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES15 SP3", os_ver + " SP" + service_pack);

var pkgs = [
    {'reference':'kernel-livepatch-5_3_18-59_5-default-6-2.2', 'sp':'3', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sle-module-live-patching-release-15.3']}
];

var ltss_caveat_required = FALSE;
var flag = 0;
foreach var package_array ( 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++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      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_3_18-59_5-default');
}