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 :
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(87586);
script_version("2.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");
script_cve_id("CVE-2015-8370");
script_name(english:"Scientific Linux Security Update : grub2 on SL7.x x86_64 (20151215)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:
"The remote Scientific Linux host is missing one or more security
updates."
);
script_set_attribute(
attribute:"description",
value:
"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 Scientific 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."
);
# https://listserv.fnal.gov/scripts/wa.exe?A2=ind1512&L=scientific-linux-errata&F=&S=&P=19156
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?f6aaca9d"
);
script_set_attribute(attribute:"solution", value:"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:grub2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:grub2-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:grub2-efi");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:grub2-efi-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:grub2-tools");
script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");
script_set_attribute(attribute:"vuln_publication_date", value:"2015/12/16");
script_set_attribute(attribute:"patch_publication_date", value:"2015/12/15");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/22");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2015-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Scientific Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/RedHat/release", "Host/RedHat/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 7.x", "Scientific Linux " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);
flag = 0;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"grub2-2.02-0.33.el7_2")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"grub2-debuginfo-2.02-0.33.el7_2")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"grub2-efi-2.02-0.33.el7_2")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"grub2-efi-modules-2.02-0.33.el7_2")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"grub2-tools-2.02-0.33.el7_2")) 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, "grub2 / grub2-debuginfo / grub2-efi / grub2-efi-modules / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
fermilab | scientific_linux | grub2 | p-cpe:/a:fermilab:scientific_linux:grub2 |
fermilab | scientific_linux | grub2-debuginfo | p-cpe:/a:fermilab:scientific_linux:grub2-debuginfo |
fermilab | scientific_linux | grub2-efi | p-cpe:/a:fermilab:scientific_linux:grub2-efi |
fermilab | scientific_linux | grub2-efi-modules | p-cpe:/a:fermilab:scientific_linux:grub2-efi-modules |
fermilab | scientific_linux | grub2-tools | p-cpe:/a:fermilab:scientific_linux:grub2-tools |
fermilab | scientific_linux | x-cpe:/o:fermilab:scientific_linux |