EulerOS Virtualization for ARM 64 3.0.1.0 : libssh2 (EulerOS-SA-2019-1393)

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

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

if (description)
{
  script_id(124896);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");

  script_cve_id(
    "CVE-2016-0787",
    "CVE-2019-3855",
    "CVE-2019-3856",
    "CVE-2019-3857",
    "CVE-2019-3863"
  );

  script_name(english:"EulerOS Virtualization for ARM 64 3.0.1.0 : libssh2 (EulerOS-SA-2019-1393)");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS Virtualization for ARM 64 host is missing multiple security
updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the libssh2 package installed, the
EulerOS Virtualization for ARM 64 installation on the remote host is
affected by the following vulnerabilities :

  - A type confusion issue was found in the way libssh2
    generated ephemeral secrets for the
    diffie-hellman-group1 and diffie-hellman-group14 key
    exchange methods. This would cause an SSHv2
    Diffie-Hellman handshake to use significantly less
    secure random parameters.(CVE-2016-0787)

  - An integer overflow flaw, which could lead to an out of
    bounds write, was discovered in libssh2 before 1.8.1 in
    the way keyboard prompt requests are parsed. A remote
    attacker who compromises a SSH server may be able to
    execute code on the client system when a user connects
    to the server.(CVE-2019-3856)

  - A flaw was found in libssh2 before 1.8.1. A server
    could send a multiple keyboard interactive response
    messages whose total length are greater than unsigned
    char max characters. This value is used as an index to
    copy memory causing in an out of bounds memory write
    error.(CVE-2019-3863)

  - An integer overflow flaw which could lead to an out of
    bounds write was discovered in libssh2 before 1.8.1 in
    the way packets are read from the server. A remote
    attacker who compromises a SSH server may be able to
    execute code on the client system when a user connects
    to the server.(CVE-2019-3855)

  - An integer overflow flaw which could lead to an out of
    bounds write was discovered in libssh2 before 1.8.1 in
    the way SSH_MSG_CHANNEL_REQUEST packets with an exit
    signal are parsed. A remote attacker who compromises a
    SSH server may be able to execute code on the client
    system when a user connects to the
    server.(CVE-2019-3857)

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-2019-1393
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ef1232f4");
  script_set_attribute(attribute:"solution", value:
"Update the affected libssh2 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:N/AC:L/PR:N/UI:R/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:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"patch_publication_date", value:"2019/05/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/05/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libssh2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:3.0.1.0");
  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) 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/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "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");
uvp = get_kb_item("Host/EulerOS/uvp_version");
if (uvp != "3.0.1.0") audit(AUDIT_OS_NOT, "EulerOS Virtualization 3.0.1.0");
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 = ["libssh2-1.4.3-10.1.h3"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", 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, "libssh2");
}