Virtuozzo 6 : parallels-server-bm-release / vzkernel / etc (VZA-2019-067)

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

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

if (description)
{
  script_id(128032);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id(
    "CVE-2017-17805",
    "CVE-2018-17972",
    "CVE-2019-1125",
    "CVE-2019-11810",
    "CVE-2019-5489"
  );

  script_name(english:"Virtuozzo 6 : parallels-server-bm-release / vzkernel / etc (VZA-2019-067)");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Virtuozzo host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the parallels-server-bm-release /
vzkernel / etc packages installed, the Virtuozzo installation on the
remote host is affected by the following vulnerabilities :

  - A new software page cache side channel attack scenario
    was discovered in operating systems that implement the
    very common 'page cache' caching mechanism. A malicious
    user/process could use 'in memory' page-cache knowledge
    to infer access timings to shared memory and gain
    knowledge which can be used to reduce effectiveness of
    cryptographic strength by monitoring algorithmic
    behavior, infer access patterns of memory to determine
    code paths taken, and exfiltrate data to a blinded
    attacker through page-granularity access times as a
    side-channel.

  - The Salsa20 encryption algorithm in the Linux kernel,
    before 4.14.8, does not correctly handle zero-length
    inputs. This allows a local attacker the ability to use
    the AF_ALG-based skcipher interface to cause a denial
    of service (uninitialized-memory free and kernel crash)
    or have an unspecified other impact by executing a
    crafted sequence of system calls that use the
    blkcipher_walk API. Both the generic implementation
    (crypto/salsa20_generic.c) and x86 implementation
    (arch/x86/crypto/salsa20_glue.c) of Salsa20 are
    vulnerable.

  - An issue was discovered in the proc_pid_stack function
    in fs/proc/base.c in the Linux kernel. An attacker with
    a local account can trick the stack unwinder code to
    leak stack contents to userspace. The fix allows only
    root to inspect the kernel stack of an arbitrary task.

  - A Spectre gadget was found in the Linux kernel's
    implementation of system interrupts. An attacker with
    local access could use this information to reveal
    private data through a Spectre like side channel.

  - A flaw was found in the Linux kernel, prior to version
    5.0.7, in drivers/scsi/megaraid/megaraid_sas_base.c,
    where a NULL pointer dereference can occur when
    megasas_create_frame_pool() fails in
    megasas_alloc_cmds(). An attacker can crash the system
    if they were able to load the megaraid_sas kernel
    module and groom memory beforehand, leading to a denial
    of service (DoS), related to a use-after-free.

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-2019-067");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHBA-2019:1651");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2019:2473");
  script_set_attribute(attribute:"solution", value:
"Update the affected parallels-server-bm-release / vzkernel / etc packages.");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-17805");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"patch_publication_date", value:"2019/08/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:virtuozzo:virtuozzo:parallels-server-bm-release");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:virtuozzo:virtuozzo:vzkernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:virtuozzo:virtuozzo:vzkernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:virtuozzo:virtuozzo:vzkernel-firmware");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:virtuozzo:virtuozzo:vzmodules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:virtuozzo:virtuozzo:vzmodules-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:virtuozzo:virtuozzo:6");
  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) 2019-2021 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");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.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|$)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Virtuozzo");
os_ver = os_ver[1];
if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Virtuozzo 6.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);

flag = 0;

pkgs = ["parallels-server-bm-release-6.0.12-3747",
        "vzkernel-2.6.32-042stab140.1",
        "vzkernel-devel-2.6.32-042stab140.1",
        "vzkernel-firmware-2.6.32-042stab140.1",
        "vzmodules-2.6.32-042stab140.1",
        "vzmodules-devel-2.6.32-042stab140.1"];

foreach (pkg in pkgs)
  if (rpm_check(release:"Virtuozzo-6", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "parallels-server-bm-release / vzkernel / etc");
}