Virtuozzo 7 : readykernel-patch (VZA-2017-007)

2017-03-27T00:00:00
ID VIRTUOZZO_VZA-2017-007.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 vulnerabilities :

  • A double free vulnerability was found in netlink_dump, which could cause a denial of service or possibly other unspecified impact.

  • It was discovered that the Linux kernel since 3.6-rc1 with 'net.ipv4.tcp_fastopen' set to 1 can hit BUG() statement in tcp_collapse() function after making a number of certain syscalls leading to a possible system crash.

  • A flaw was found in the way nfnetlink validated length of batch messages that could allow a user logged in to a container as root to cause a general protection fault and crash the host.

  • A flaw was found in the way nfnetlink handled errors while processing batch messages that could allow a user logged in to a container as root to trigger use after free and crash the host.

  • A security flaw was found in the Linux kernel that an attempt to move page mapped by AIO ring buffer to the other node triggers NULL pointer dereference at trace_writeback_dirty_page(), because aio_fs_backing_dev_info.dev is 0.

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(97979);
  script_version("1.13");
  script_cvs_date("Date: 2019/01/14 10:10:15");

  script_cve_id(
    "CVE-2016-3070",
    "CVE-2016-8645",
    "CVE-2016-9806"
  );

  script_name(english:"Virtuozzo 7 : readykernel-patch (VZA-2017-007)");
  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 vulnerabilities :

  - A double free vulnerability was found in netlink_dump,
    which could cause a denial of service or possibly other
    unspecified impact.

  - It was discovered that the Linux kernel since 3.6-rc1
    with 'net.ipv4.tcp_fastopen' set to 1 can hit BUG()
    statement in tcp_collapse() function after making a
    number of certain syscalls leading to a possible system
    crash.

  - A flaw was found in the way nfnetlink validated length
    of batch messages that could allow a user logged in to
    a container as root to cause a general protection fault
    and crash the host.

  - A flaw was found in the way nfnetlink handled errors
    while processing batch messages that could allow a user
    logged in to a container as root to trigger use after
    free and crash the host.

  - A security flaw was found in the Linux kernel that an
    attempt to move page mapped by AIO ring buffer to the
    other node triggers NULL pointer dereference at
    trace_writeback_dirty_page(), because
    aio_fs_backing_dev_info.dev is 0.

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/2750452");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2016-3070");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2016-8645");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2016-9806");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-20.18-11.0-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?356fc3c7");
  script_set_attribute(attribute:"solution", value:"Update the readykernel patch.");
  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:"patch_publication_date", value:"2017/02/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/03/27");

  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-3.10.0-327.36.1.vz7.20.18",
    "patch","readykernel-patch-20.18-11.0-1.vl7"
  )
);
readykernel_execute_checks(checks:checks, severity:SECURITY_HOLE, release:"Virtuozzo-7");