RedHat Update for grub2 RHSA-2015:2623-01

###############################################################################
# OpenVAS Vulnerability Test
#
# RedHat Update for grub2 RHSA-2015:2623-01
#
# Authors:
# System Generated Check
#
# Copyright:
# Copyright (C) 2015 Greenbone Networks GmbH, http://www.greenbone.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.871523");
  script_version("$Revision: 12497 $");
  script_tag(name:"last_modification", value:"$Date: 2018-11-23 09:28:21 +0100 (Fri, 23 Nov 2018) $");
  script_tag(name:"creation_date", value:"2015-12-16 05:49:25 +0100 (Wed, 16 Dec 2015)");
  script_cve_id("CVE-2015-8370");
  script_tag(name:"cvss_base", value:"6.9");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_tag(name:"qod_type", value:"package");
  script_name("RedHat Update for grub2 RHSA-2015:2623-01");
  script_tag(name:"summary", value:"The remote host is missing an update for the 'grub2'
  package(s) announced via the referenced advisory.");
  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
  script_tag(name:"insight", value:"The grub2 packages provide version 2 of
the Grand Unified Bootloader (GRUB), a highly configurable and customizable
bootloader with modular architecture. The packages support a variety of kernel
formats, file systems, computer architectures, and hardware devices.

A flaw was found in the way the grub2 handled backspace characters entered
in username and password prompts. An attacker with access to the system
console could use this flaw to bypass grub2 password protection and gain
administrative access to the system. (CVE-2015-8370)

This update also fixes the following bug:

  * When upgrading from Red Hat Enterprise Linux 7.1 and earlier, a
configured boot password was not correctly migrated to the newly introduced
user.cfg configuration files. This could possibly prevent system
administrators from changing grub2 configuration during system boot even if
they provided the correct password. This update corrects the password
migration script and the incorrectly generated user.cfg file. (BZ#1290089)

All grub2 users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.");
  script_tag(name:"affected", value:"grub2 on Red Hat Enterprise Linux Server (v. 7)");
  script_tag(name:"solution", value:"Please Install the Updated Packages.");
  script_xref(name:"RHSA", value:"2015:2623-01");
  script_xref(name:"URL", value:"https://www.redhat.com/archives/rhsa-announce/2015-December/msg00038.html");
  script_tag(name:"solution_type", value:"VendorFix");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2015 Greenbone Networks GmbH");
  script_family("Red Hat Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/rhel", "ssh/login/rpms", re:"ssh/login/release=RHENT_7");

  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-rpm.inc");

release = rpm_get_ssh_release();
if(!release) exit(0);

res = "";

if(release == "RHENT_7")
{

  if ((res = isrpmvuln(pkg:"grub2", rpm:"grub2~2.02~0.33.el7_2", rls:"RHENT_7")) != NULL)
  {
    security_message(data:res);
    exit(0);
  }

  if ((res = isrpmvuln(pkg:"grub2-debuginfo", rpm:"grub2-debuginfo~2.02~0.33.el7_2", rls:"RHENT_7")) != NULL)
  {
    security_message(data:res);
    exit(0);
  }

  if ((res = isrpmvuln(pkg:"grub2-efi", rpm:"grub2-efi~2.02~0.33.el7_2", rls:"RHENT_7")) != NULL)
  {
    security_message(data:res);
    exit(0);
  }

  if ((res = isrpmvuln(pkg:"grub2-tools", rpm:"grub2-tools~2.02~0.33.el7_2", rls:"RHENT_7")) != NULL)
  {
    security_message(data:res);
    exit(0);
  }

  if (__pkg_match) exit(99);
  exit(0);
}