Virtuozzo 7 : readykernel-patch (VZA-2017-091)

2017-10-06T00:00:00
ID VIRTUOZZO_VZA-2017-091.NASL
Type nessus
Reporter Tenable
Modified 2019-01-14T00:00:00

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 :

  • It was discovered that the key management subsystem of the Linux kernel could perform incorrect update operations on uninstantiated keys. A local unprivileged user could exploit this flaw to cause a NULL pointer dereference in the kernel and crash it.

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(103681);
  script_version("2.3");
  script_cvs_date("Date: 2019/01/14 10:10:15");

  script_name(english:"Virtuozzo 7 : readykernel-patch (VZA-2017-091)");
  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 :

  - It was discovered that the key management subsystem of
    the Linux kernel could perform incorrect update
    operations on uninstantiated keys. A local unprivileged
    user could exploit this flaw to cause a NULL pointer
    dereference in the kernel and crash it.

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/2884969");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-15.2-33.1-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?83b76611");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-18.7-33.1-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f898b16b");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-20.18-33.1-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0931a20b");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.10-33.1-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bebee442");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.15-33.1-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?aee43583");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-33.22-33.1-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?05609d81");
  script_set_attribute(attribute:"solution", value:"Update the readykernel patch.");
  script_set_attribute(attribute:"risk_factor", value:"Medium");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/10/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/06");

  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) 2017-2019 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-3.10.0-327.18.2.vz7.15.2",
    "patch","readykernel-patch-15.2-33.1-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-327.36.1.vz7.18.7",
    "patch","readykernel-patch-18.7-33.1-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-327.36.1.vz7.20.18",
    "patch","readykernel-patch-20.18-33.1-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-514.16.1.vz7.30.10",
    "patch","readykernel-patch-30.10-33.1-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-514.16.1.vz7.30.15",
    "patch","readykernel-patch-30.15-33.1-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-514.26.1.vz7.33.22",
    "patch","readykernel-patch-33.22-33.1-1.vl7"
  )
);
readykernel_execute_checks(checks:checks, severity:SECURITY_WARNING, release:"Virtuozzo-7");