Virtuozzo 7 : readykernel-patch (VZA-2019-068)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

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

if (description)
{
  script_id(133458);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/28");

  script_cve_id("CVE-2018-16871", "CVE-2019-11477");
  script_xref(name:"CEA-ID", value:"CEA-2019-0456");

  script_name(english:"Virtuozzo 7 : readykernel-patch (VZA-2019-068)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Virtuozzo host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"According to the version of the vzkernel package and the
readykernel-patch installed, the Virtuozzo installation on the remote
host is affected by the following vulnerabilities :

  - tcp: integer overflow while processing SACK blocks
    allows remote denial of service. An integer overflow
    was found in the way the Linux kernel's networking
    subsystem processed TCP Selective Acknowledgment (SACK)
    segments. While processing SACK segments, the Linux
    kernel's socket buffer (SKB) data structure becomes
    fragmented. Each fragment is about TCP maximum segment
    size (MSS) bytes. To efficiently process SACK blocks,
    the Linux kernel merges multiple fragmented SKBs into
    one, potentially overflowing the variable holding the
    number of segments. A remote attacker could use this
    flaw to crash the Linux kernel by sending a crafted
    sequence of SACK segments on a TCP connection with
    small value of TCP MSS, resulting in a denial of
    service.

  - nfs: NULL pointer dereference due to an anomalized NFS
    message sequence. An attacker, who is able to mount an
    exported NFS filesystem, is able to trigger a null
    pointer dereference by using an invalid NFS sequence.
    This can panic the machine and deny access to the NFS
    server. Any outstanding disk writes to the NFS server
    will be lost.

Note that Tenable Network Security has extracted the preceding
description block directly from the Virtuozzo security advisory.
Tenable has attempted to automatically clean and format it as much as
possible without introducing additional issues.");
  script_set_attribute(attribute:"see_also", value:"https://virtuozzosupport.force.com/s/article/VZA-2019-068");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-43.10-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f75313dd");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-46.7-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a6382ef0");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-48.2-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fce0b0f5");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-63.3-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1193994a");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-64.7-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d0f897ef");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-73.24-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3f4cb69c");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-73.29-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7e46c367");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-85.17-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a97adc25");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-86.2-85.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?34a0ef2a");
  script_set_attribute(attribute:"solution", value:
"Update the readykernel patch.");
  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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-2019-11477");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"patch_publication_date", value:"2019/08/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:virtuozzo:virtuozzo:readykernel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:virtuozzo:virtuozzo:7");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Virtuozzo/release", "Host/Virtuozzo/rpm-list", "Host/readykernel-info");

  exit(0);
}

include("global_settings.inc");
include("readykernel.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/Virtuozzo/release");
if (isnull(release) || "Virtuozzo" >!< release) audit(AUDIT_OS_NOT, "Virtuozzo");
os_ver = pregmatch(pattern: "Virtuozzo Linux release ([0-9]+\.[0-9])(\D|$)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Virtuozzo");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Virtuozzo 7.x", "Virtuozzo " + os_ver);

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

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Virtuozzo", cpu);

rk_info = get_kb_item("Host/readykernel-info");
if (empty_or_null(rk_info)) audit(AUDIT_UNKNOWN_APP_VER, "Virtuozzo");

checks = make_list2(
  make_array(
    "kernel","vzkernel-3.10.0-693.17.1.vz7.43.10",
    "patch","readykernel-patch-43.10-85.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-693.21.1.vz7.46.7",
    "patch","readykernel-patch-46.7-85.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-693.21.1.vz7.48.2",
    "patch","readykernel-patch-48.2-85.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-862.11.6.vz7.64.7",
    "patch","readykernel-patch-63.3-85.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-862.20.2.vz7.73.24",
    "patch","readykernel-patch-64.7-85.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-862.20.2.vz7.73.29",
    "patch","readykernel-patch-73.24-85.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-862.9.1.vz7.63.3",
    "patch","readykernel-patch-73.29-85.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-957.10.1.vz7.85.17",
    "patch","readykernel-patch-85.17-85.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-957.12.2.vz7.86.2",
    "patch","readykernel-patch-86.2-85.0-1.vl7"
  )
);
readykernel_execute_checks(checks:checks, severity:SECURITY_HOLE, release:"Virtuozzo-7");