CentOS 6 : krb5 (CESA-2014:1389)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2014:1389 and 
# CentOS Errata and Security Advisory 2014:1389 respectively.
#

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

if (description)
{
  script_id(79178);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2013-1418", "CVE-2013-6800", "CVE-2014-4341", "CVE-2014-4342", "CVE-2014-4343", "CVE-2014-4344", "CVE-2014-4345");
  script_bugtraq_id(63555, 63770, 68908, 68909, 69159, 69160, 69168);
  script_xref(name:"RHSA", value:"2014:1389");

  script_name(english:"CentOS 6 : krb5 (CESA-2014:1389)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated krb5 packages that fix multiple security issues and several
bugs are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

Kerberos is a networked authentication system which allows clients and
servers to authenticate to each other with the help of a trusted third
party, the Kerberos KDC.

It was found that if a KDC served multiple realms, certain requests
could cause the setup_server_realm() function to dereference a NULL
pointer. A remote, unauthenticated attacker could use this flaw to
crash the KDC using a specially crafted request. (CVE-2013-1418,
CVE-2013-6800)

A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO
acceptor for continuation tokens. A remote, unauthenticated attacker
could use this flaw to crash a GSSAPI-enabled server application.
(CVE-2014-4344)

A buffer overflow was found in the KADM5 administration server
(kadmind) when it was used with an LDAP back end for the KDC database.
A remote, authenticated attacker could potentially use this flaw to
execute arbitrary code on the system running kadmind. (CVE-2014-4345)

Two buffer over-read flaws were found in the way MIT Kerberos handled
certain requests. A remote, unauthenticated attacker who is able to
inject packets into a client or server application's GSSAPI session
could use either of these flaws to crash the application.
(CVE-2014-4341, CVE-2014-4342)

A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An
attacker able to spoof packets to appear as though they are from an
GSSAPI acceptor could use this flaw to crash a client application that
uses MIT Kerberos. (CVE-2014-4343)

These updated krb5 packages also include several bug fixes. Space
precludes documenting all of these changes in this advisory. Users are
directed to the Red Hat Enterprise Linux 6.6 Technical Notes, linked
to in the References section, for information on the most significant
of these changes.

All krb5 users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues."
  );
  # https://lists.centos.org/pipermail/centos-cr-announce/2014-October/001224.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?04a5ef38"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected krb5 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-4345");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-pkinit-openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-server-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-workstation");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2013/11/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2014/10/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/11/12");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2014-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-6", reference:"krb5-devel-1.10.3-33.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"krb5-libs-1.10.3-33.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"krb5-pkinit-openssl-1.10.3-33.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"krb5-server-1.10.3-33.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"krb5-server-ldap-1.10.3-33.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"krb5-workstation-1.10.3-33.el6")) flag++;


if (flag)
{
  cr_plugin_caveat = '\n' +
    'NOTE: The security advisory associated with this vulnerability has a\n' +
    'fixed package version that may only be available in the continuous\n' +
    'release (CR) repository for CentOS, until it is present in the next\n' +
    'point release of CentOS.\n\n' +

    'If an equal or higher package level does not exist in the baseline\n' +
    'repository for your major version of CentOS, then updates from the CR\n' +
    'repository will need to be applied in order to address the\n' +
    'vulnerability.\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get() + cr_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "krb5-devel / krb5-libs / krb5-pkinit-openssl / krb5-server / etc");
}