EulerOS 2.0 SP8 : libvncserver (EulerOS-SA-2020-1811)

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

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

if (description)
{
  script_id(139141);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/12");

  script_cve_id(
    "CVE-2018-21247",
    "CVE-2019-20839",
    "CVE-2020-14397",
    "CVE-2020-14398",
    "CVE-2020-14399",
    "CVE-2020-14400",
    "CVE-2020-14401",
    "CVE-2020-14402",
    "CVE-2020-14403",
    "CVE-2020-14404",
    "CVE-2020-14405"
  );

  script_name(english:"EulerOS 2.0 SP8 : libvncserver (EulerOS-SA-2020-1811)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the libvncserver package installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/hextile.c allows out-of-bounds access via
    encodings.(CVE-2020-14403)

  - An issue was discovered in LibVNCServer before 0.9.13.
    An improperly closed TCP connection causes an infinite
    loop in libvncclient/sockets.c.(CVE-2020-14398)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/scale.c has a pixel_value integer
    overflow.(CVE-2020-14401)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/corre.c allows out-of-bounds access via
    encodings.(CVE-2020-14402)

  - An issue was discovered in LibVNCServer before 0.9.13.
    Byte-aligned data is accessed through uint16_t pointers
    in libvncserver/translate.c.(CVE-2020-14400)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/rre.c allows out-of-bounds access via
    encodings.(CVE-2020-14404)

  - An issue was discovered in LibVNCServer before 0.9.13.
    There is an information leak (of uninitialized memory
    contents) in the libvncclient/rfbproto.c
    ConnectToRFBRepeater function.(CVE-2018-21247)

  - libvncclient/sockets.c in LibVNCServer before 0.9.13
    has a buffer overflow via a long socket
    filename.(CVE-2019-20839)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncclient/rfbproto.c does not limit TextChat
    size.(CVE-2020-14405)

  - An issue was discovered in LibVNCServer before 0.9.13.
    libvncserver/rfbregion.c has a NULL pointer
    dereference.(CVE-2020-14397)

  - An issue was discovered in LibVNCServer before 0.9.13.
    Byte-aligned data is accessed through uint32_t pointers
    in libvncclient/rfbproto.c.(CVE-2020-14399)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2020-1811
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6adb34ca");
  script_set_attribute(attribute:"solution", value:
"Update the affected libvncserver packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/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:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-14401");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2018-21247");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libvncserver");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  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/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(8)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);

flag = 0;

pkgs = ["libvncserver-0.9.11-8.h2.eulerosv2r8"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"8", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, "libvncserver");
}