Virtuozzo 7 : readykernel-patch (VZA-2018-050)

2018-08-07T00:00:00
ID VIRTUOZZO_VZA-2018-050.NASL
Type nessus
Reporter This script is Copyright (C) 2018-2021 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2018-08-07T00:00:00

Description

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 vulnerability :

  • The implementation of timer_create system call in the Linux kernel before 4.14.8 doesn't properly validate the sigevent::sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

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.

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

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

if (description)
{
  script_id(111582);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/03/08");

  script_cve_id(
    "CVE-2017-18344"
  );

  script_name(english:"Virtuozzo 7 : readykernel-patch (VZA-2018-050)");
  script_summary(english:"Checks the readykernel output for the updated patch.");

  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 vulnerability :

  - The implementation of timer_create system call in the
    Linux kernel before 4.14.8 doesn't properly validate
    the sigevent::sigev_notify field, which leads to
    out-of-bounds access in the show_timer function (called
    when /proc/$PID/timers is read). This allows userspace
    applications to read arbitrary kernel memory (on a
    kernel built with CONFIG_POSIX_TIMERS and
    CONFIG_CHECKPOINT_RESTORE).

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://help.virtuozzo.com/customer/portal/articles/2950677");
  script_set_attribute(attribute:"see_also", value:"http://www.openwall.com/lists/oss-security/2018/08/02/3");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.10-56.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?903233bb");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.15-56.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f3743365");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-33.22-56.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d05a0bee");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-37.30-56.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?07422f3e");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-40.4-56.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?03069afa");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-43.10-56.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?547b160b");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-46.7-56.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?59613f5f");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-48.2-56.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?07caf03d");
  script_set_attribute(attribute:"solution", value:"Update the readykernel patch.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:F/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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"patch_publication_date", value:"2018/08/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/07");

  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) 2018-2021 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-3.10.0-514.16.1.vz7.30.10",
    "patch","readykernel-patch-30.10-56.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-514.16.1.vz7.30.15",
    "patch","readykernel-patch-30.15-56.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-514.26.1.vz7.33.22",
    "patch","readykernel-patch-33.22-56.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-693.1.1.vz7.37.30",
    "patch","readykernel-patch-37.30-56.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-693.11.6.vz7.40.4",
    "patch","readykernel-patch-40.4-56.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-693.17.1.vz7.43.10",
    "patch","readykernel-patch-43.10-56.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-693.21.1.vz7.46.7",
    "patch","readykernel-patch-46.7-56.0-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-693.21.1.vz7.48.2",
    "patch","readykernel-patch-48.2-56.0-1.vl7"
  )
);
readykernel_execute_checks(checks:checks, severity:SECURITY_NOTE, release:"Virtuozzo-7");