RHEL 8 : openvswitch (Unpatched Vulnerability)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory openvswitch. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(195853);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/11");

  script_cve_id(
    "CVE-2018-17204",
    "CVE-2018-17205",
    "CVE-2018-17206",
    "CVE-2019-25076",
    "CVE-2020-35498",
    "CVE-2021-3905",
    "CVE-2021-36980",
    "CVE-2022-4337",
    "CVE-2022-4338",
    "CVE-2023-1668",
    "CVE-2023-5366"
  );

  script_name(english:"RHEL 8 : openvswitch (Unpatched Vulnerability)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat 8 host is affected by multiple vulnerabilities that will not be patched.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has one or more packages installed that are affected by multiple
vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - openvswitch: limitation in the OVS packet parsing in userspace leads to DoS (CVE-2020-35498)

  - openvswitch: Integer Underflow in Organization Specific TLV (CVE-2022-4338)

  - An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting
    parse_group_prop_ntr_selection_method in lib/ofp-util.c. When decoding a group mod, it validates the group
    type and command after the whole group mod has been decoded. The OF1.5 decoder, however, tries to use the
    type and command earlier, when it might still be invalid. This causes an assertion failure (via
    OVS_NOT_REACHED). ovs-vswitchd does not enable support for OpenFlow 1.5 by default. (CVE-2018-17204)

  - An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto_rule_insert__ in
    ofproto/ofproto.c. During bundle commit, flows that are added in a bundle are applied to ofproto in order.
    If a flow cannot be added (e.g., the flow action is a go-to for a group id that does not exist), OvS tries
    to revert back all previous flows that were successfully applied from the same bundle. This is possible
    since OvS maintains list of old flows that were replaced by flows from the bundle. While reinserting old
    flows, OvS has an assertion failure due to a check on rule state != RULE_INITIALIZED. This would work for
    new flows, but for an old flow the rule state is RULE_REMOVED. The assertion failure causes an OvS crash.
    (CVE-2018-17205)

  - An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6. The decode_bundle function inside
    lib/ofp-actions.c is affected by a buffer over-read issue during BUNDLE action decoding. (CVE-2018-17206)

  - The TSS (Tuple Space Search) algorithm in Open vSwitch 2.x through 2.17.2 and 3.0.0 allows remote
    attackers to cause a denial of service (delays of legitimate traffic) via crafted packet data that
    requires excessive evaluation time within the packet classification algorithm for the MegaFlow cache, aka
    a Tuple Space Explosion (TSE) attack. (CVE-2019-25076)

  - Open vSwitch (aka openvswitch) 2.11.0 through 2.15.0 has a use-after-free in decode_NXAST_RAW_ENCAP
    (called from ofpact_decode and ofpacts_decode) during the decoding of a RAW_ENCAP action. (CVE-2021-36980)

  - A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker
    could use this flaw to potentially exhaust available memory by keeping sending packet fragments.
    (CVE-2021-3905)

  - An out-of-bounds read in Organization Specific TLV was found in various versions of OpenvSwitch.
    (CVE-2022-4337)

  - A flaw was found in openvswitch (OVS). When processing an IP packet with protocol 0, OVS will install the
    datapath flow without the action modifying the IP header. This issue results (for both kernel and
    userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is wildcarded) for
    this flow, but with an incorrect action, possibly causing incorrect handling of other IP packets with a !=
    0 IP protocol that matches this dp flow. (CVE-2023-1668)

  - A flaw was found in Open vSwitch that allows ICMPv6 Neighbor Advertisement packets between virtual
    machines to bypass OpenFlow rules. This issue may allow a local attacker to create specially crafted
    packets with a modified or spoofed target IP address field that can redirect ICMPv6 traffic to arbitrary
    IP addresses. (CVE-2023-5366)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package
is installed.");
  script_set_attribute(attribute:"solution", value:
"The vendor has acknowledged the vulnerabilities but no solution has been provided. Refer to the vendor for remediation
guidance.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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-2020-35498");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2022-4338");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/09/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/05/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.15");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.16");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch3.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rhvm-appliance");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');
include('rhel.inc');

if (!get_kb_item("global_settings/vendor_unpatched"))
exit(0, "Unpatched Vulnerabilities Detection not active.");

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '8')) audit(AUDIT_OS_NOT, 'Red Hat 8.x', 'Red Hat ' + os_ver);

if (!get_kb_item('Host/RedHat/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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'pkgs': [
      {'reference':'openvswitch2.11', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'openvswitch2.11', 'cves':['CVE-2019-25076', 'CVE-2022-4337', 'CVE-2022-4338', 'CVE-2023-1668', 'CVE-2023-5366']},
      {'reference':'openvswitch2.12', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'openvswitch2.12', 'cves':['CVE-2019-25076', 'CVE-2020-35498', 'CVE-2021-3905', 'CVE-2021-36980', 'CVE-2023-1668', 'CVE-2023-5366']},
      {'reference':'openvswitch2.16', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'openvswitch2.16', 'cves':['CVE-2019-25076', 'CVE-2023-1668', 'CVE-2023-5366']},
      {'reference':'rhvm-appliance', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'rhvm-appliance', 'cves':['CVE-2018-17204', 'CVE-2018-17205', 'CVE-2018-17206']}
    ]
  }
];


var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  var enterprise_linux_flag = rhel_repo_urls_has_content_dist_rhel(repo_urls:repo_relative_urls);
  foreach var pkg ( constraint_array['pkgs'] ) {
    var unpatched_pkg = NULL;
    var _release = NULL;
    var sp = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var exists_check = NULL;
    var cves = NULL;
    if (!empty_or_null(pkg['unpatched_pkg'])) unpatched_pkg = pkg['unpatched_pkg'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (unpatched_pkg &&
        _release &&
        (!exists_check || rpm_exists(release:_release, rpm:exists_check)) &&
        unpatched_package_exists(release:_release, package:unpatched_pkg, cves: cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : unpatched_packages_report()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'openvswitch2.11 / openvswitch2.12 / openvswitch2.16 / etc');
}