Amazon Linux AMI : freeradius (ALAS-2017-865)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2017-865.
#

include("compat.inc");

if (description)
{
  script_id(102180);
  script_version("3.3");
  script_cvs_date("Date: 2018/04/18 15:09:36");

  script_cve_id("CVE-2017-10978", "CVE-2017-10979", "CVE-2017-10980", "CVE-2017-10981", "CVE-2017-10982", "CVE-2017-10983");
  script_xref(name:"ALAS", value:"2017-865");

  script_name(english:"Amazon Linux AMI : freeradius (ALAS-2017-865)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Amazon Linux AMI host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Out-of-bounds read in fr_dhcp_decode_options() :

An out-of-bounds read flaw was found in the way FreeRADIUS server
handles decoding of DHCP packets. A remote attacker could use this
flaw to crash the FreeRADIUS server by sending a specially crafted
DHCP request. (CVE-2017-10982)

Out-of-bounds read in fr_dhcp_decode() when decoding option 63 :

An out-of-bounds read flaw was found in the way FreeRADIUS server
handled decoding of DHCP packets. A remote attacker could use this
flaw to crash the FreeRADIUS server by sending a specially crafted
DHCP request. (CVE-2017-10983)

Memory leak in decode_tlv() :

A memory leak flaw was found in the way FreeRADIUS server handles
decoding of DHCP packets. A remote attacker could use this flaw to
cause the FreeRADIUS server to consume an increasing amount of memory
resources over time possibly leading to a crash due to memory
exhaustion. (CVE-2017-10980)

Memory leak in fr_dhcp_decode() :

A memory leak flaw was found in the way FreeRADIUS server handles
decoding of DHCP packets. A remote attacker could use this flaw to
cause the FreeRADIUS server to consume an increasing amount of memory
resources over time, possibly leading to a crash due to memory
exhaustion, by sending specially crafted DHCP packets.
(CVE-2017-10981)

Out-of-bounds write in rad_coalesce() :

An out-of-bounds write flaw was found in the way FreeRADIUS server
handled certain attributes in request packets. A remote attacker could
use this flaw to crash the FreeRADIUS server or to execute arbitrary
code in the context of the FreeRADIUS server process by sending a
specially crafted request packet. (CVE-2017-10979)

Out-of-bounds read/write due to improper output buffer size check in
make_secret() :

An out-of-bounds read and write flaw was found in the way FreeRADIUS
server handled RADIUS packets. A remote attacker could use this flaw
to crash the FreeRADIUS server by sending a specially crafted RADIUS
packet. (CVE-2017-10978)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2017-865.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update freeradius' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-krb5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-postgresql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-unixODBC");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freeradius-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/04");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 Tenable Network Security, Inc.");
  script_family(english:"Amazon Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  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/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (rpm_check(release:"ALA", reference:"freeradius-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-debuginfo-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-krb5-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-ldap-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-mysql-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-perl-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-postgresql-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-python-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-unixODBC-2.2.6-7.16.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"freeradius-utils-2.2.6-7.16.amzn1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "freeradius / freeradius-debuginfo / freeradius-krb5 / etc");
}