Virtuozzo 7 : readykernel-patch (VZA-2018-026)

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

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

if (description)
{
  script_id(109623);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id(
    "CVE-2017-17448",
    "CVE-2017-17449",
    "CVE-2017-17450",
    "CVE-2017-17807"
  );

  script_name(english:"Virtuozzo 7 : readykernel-patch (VZA-2018-026)");
  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 :

  - It was discovered that nfnl_cthelper_list structure was
    accessible to any user with CAP_NET_ADMIN capability in
    a network namespace. An unprivileged local user could
    exploit that to affect netfilter conntrack helpers on
    the host.

  - It was discovered that a nlmon link inside a child
    network namespace was not restricted to that namespace.
    An unprivileged local user could exploit that to
    monitor system-wide netlink activity.

  - It was discovered that xt_osf_fingers data structure
    was accessible from any network namespace. This allowed
    unprivileged local users to bypass intended access
    restrictions and modify the system-wide OS fingerprint
    list used by specific iptables rules.

  - The KEYS subsystem omitted an access-control check when
    writing a key to the default keyring of the current
    task, allowing a local user to bypass security checks
    for the keyring. This compromised the validity of the
    keyring for those who relied on it.

  - If 'dccp_ipv6' module was loaded on the host, a local
    unprivileged user could trigger a kernel crash in
    dccp_write_xmit() or inet_csk_get_port() using a
    specially crafted sequence of system calls.

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/2938222");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-17448");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-17449");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-17450");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-17807");
  # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=67f93df79aeefc3add4e4b31a752600f834236e2
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0d23d0fb");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.10-49.1-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2abd43b5");
  # https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.15-49.1-1.vl7/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?13a03aa7");
  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:P/A:P");
  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:"2018/05/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/05/09");

  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-30.10-49.1-1.vl7"
  ),
  make_array(
    "kernel","vzkernel-3.10.0-514.16.1.vz7.30.15",
    "patch","readykernel-patch-30.15-49.1-1.vl7"
  )
);
readykernel_execute_checks(checks:checks, severity:SECURITY_WARNING, release:"Virtuozzo-7");