EulerOS 2.0 SP8 : dbus (EulerOS-SA-2020-1797)

2020-07-30T00:00:00
ID EULEROS_SA-2020-1797.NASL
Type nessus
Reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-07-30T00:00:00

Description

According to the version of the dbus packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  • An issue was discovered in dbus >= 1.3.0 before 1.12.18. The DBusServer in libdbus, as used in dbus-daemon, leaks file descriptors when a message exceeds the per-message file descriptor limit. A local attacker with access to the D-Bus system bus or another system service's private AF_UNIX socket could use this to make the system service reach its file descriptor limit, denying service to subsequent D-Bus clients.(CVE-2020-12049)

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(139127);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/08/03");

  script_cve_id(
    "CVE-2020-12049"
  );

  script_name(english:"EulerOS 2.0 SP8 : dbus (EulerOS-SA-2020-1797)");
  script_summary(english:"Checks the rpm output for the updated package.");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"According to the version of the dbus packages installed, the EulerOS
installation on the remote host is affected by the following
vulnerability :

  - An issue was discovered in dbus >= 1.3.0 before
    1.12.18. The DBusServer in libdbus, as used in
    dbus-daemon, leaks file descriptors when a message
    exceeds the per-message file descriptor limit. A local
    attacker with access to the D-Bus system bus or another
    system service's private AF_UNIX socket could use this
    to make the system service reach its file descriptor
    limit, denying service to subsequent D-Bus
    clients.(CVE-2020-12049)

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-2020-1797
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7065409b");
  script_set_attribute(attribute:"solution", value:
"Update the affected dbus package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/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:N/I:N/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:"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:dbus");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dbus-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dbus-daemon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dbus-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dbus-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dbus-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dbus-x11");
  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 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 = ["dbus-1.12.10-1.h7.eulerosv2r8",
        "dbus-common-1.12.10-1.h7.eulerosv2r8",
        "dbus-daemon-1.12.10-1.h7.eulerosv2r8",
        "dbus-devel-1.12.10-1.h7.eulerosv2r8",
        "dbus-libs-1.12.10-1.h7.eulerosv2r8",
        "dbus-tools-1.12.10-1.h7.eulerosv2r8",
        "dbus-x11-1.12.10-1.h7.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, "dbus");
}