Vulnerabilities > CVE-2018-1085 - Improper Authentication vulnerability in Redhat Openshift Container Platform

047910
CVSS 10.0 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
COMPLETE
Integrity impact
COMPLETE
Availability impact
COMPLETE
network
low complexity
redhat
CWE-287
critical
nessus
NVD
Published: 2018-06-15
Updated: 2019-10-09

Summary

openshift-ansible before versions 3.9.23, 3.7.46 deploys a misconfigured etcd file that causes the SSL client certificate authentication to be disabled. Quotations around the values of ETCD_CLIENT_CERT_AUTH and ETCD_PEER_CLIENT_CERT_AUTH in etcd.conf result in etcd being configured to allow remote users to connect without any authentication if they can access the etcd server bound to the network on the master nodes. An attacker could use this flaw to read and modify all the data about the Openshift cluster in the etcd datastore, potentially adding another compute node, or bringing down the entire cluster.

Vulnerable Configurations

Part Description Count
Application
Redhat
24

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Authentication Abuse
    An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
  • Man in the Middle Attack
    This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.

Nessus

NASL familyRed Hat Local Security Checks
NASL idREDHAT-RHSA-2018-2013.NASL
descriptionRed Hat OpenShift Container Platform release 3.9.31 is now available with updates to packages and images that address security issues, fix several bugs, and add enhancements. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Red Hat OpenShift Container Platform is the company
last seen2020-06-12
modified2018-12-04
plugin id119401
published2018-12-04
reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/119401
titleRHEL 7 : OpenShift Container Platform 3.9 (RHSA-2018:2013)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2018:2013. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(119401);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/11");

  script_cve_id("CVE-2018-1070", "CVE-2018-10843", "CVE-2018-1085");
  script_xref(name:"RHSA", value:"2018:2013");

  script_name(english:"RHEL 7 : OpenShift Container Platform 3.9 (RHSA-2018:2013)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Red Hat OpenShift Container Platform release 3.9.31 is now available
with updates to packages and images that address security issues, fix
several bugs, and add enhancements.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

Red Hat OpenShift Container Platform is the company's cloud computing
Platform-as-a-Service (PaaS) solution designed for on-premise or
private cloud deployments.

This advisory contains the RPM packages for Red Hat OpenShift
Container Platform 3.9.31. See the following advisory for the
container images for this release :

https://access.redhat.com/errata/RHBA-2018:2014

Security Fix(es) :

* routing: Malicious Service configuration can bring down routing for
an entire shard (CVE-2018-1070)

* openshift-ansible: Incorrectly quoted values in etcd.conf causes
disabling of SSL client certificate authentication (CVE-2018-1085)

* source-to-image: Builder images with assembler-user LABEL set to
root allows attackers to execute arbitrary code (CVE-2018-10843)

For more details about the security issue(s), including the impact, a
CVSS score, acknowledgments, and other related information, refer to
the CVE page(s) listed in the References section.

Red Hat would like to thank David Hocky (Comcast) for reporting
CVE-2018-1085. The CVE-2018-1070 issue was discovered by Mark Chappell
(Red Hat) and the CVE-2018-10843 issue was discovered by Jeremy Choi
(Red Hat).

Space precludes documenting all of the bug fixes and enhancements in
this advisory. See the following Release Notes documentation, which
will be updated shortly for this release, for details about these
changes :

https://docs.openshift.com/container-platform/3.9/release_notes/
ocp_3_9_release_notes.html

All OpenShift Container Platform 3.9 users are advised to upgrade to
these updated packages and images."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://docs.openshift.com/container-platform/3.9/release_notes/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2018:2013"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-1070"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-1085"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-10843"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  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_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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-clients-redistributable");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-cluster-capacity");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-descheduler");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-docker-excluder");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-dockerregistry");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-excluder");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-federation-services");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-master");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-node");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-node-problem-detector");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-pod");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-sdn-ovs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-service-catalog");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-template-service-broker");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-web-console");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mysql-apb-role");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-ansible");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-ansible-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-ansible-playbooks");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-ansible-roles");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:prometheus-node-exporter");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/06/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/06/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/04");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

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

  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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.x", "Red Hat " + 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 ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2018:2013";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_exists(rpm:"atomic-openshift-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-clients-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-clients-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-clients-redistributable-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-clients-redistributable-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-cluster-capacity-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-cluster-capacity-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-descheduler-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-descheduler-3.9.13-1.git.267.bb59a3f.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-docker-excluder-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"atomic-openshift-docker-excluder-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-dockerregistry-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-dockerregistry-3.9.31-1.git.351.1bd46ed.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-excluder-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"atomic-openshift-excluder-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-federation-services-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-federation-services-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-master-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-master-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-node-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-node-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-node-problem-detector-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-node-problem-detector-3.9.13-1.git.167.5d6b0d4.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-pod-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-pod-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-sdn-ovs-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-sdn-ovs-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-service-catalog-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-service-catalog-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-template-service-broker-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-template-service-broker-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-tests-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-tests-3.9.31-1.git.0.ef9737b.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-utils-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"atomic-openshift-utils-3.9.31-1.git.34.154617d.el7")) flag++;
  if (rpm_exists(rpm:"atomic-openshift-web-console-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-web-console-3.9.31-1.git.246.bded6a4.el7")) flag++;
  if (rpm_check(release:"RHEL7", reference:"mysql-apb-role-1.1.11-1.el7")) flag++;
  if (rpm_exists(rpm:"openshift-ansible-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"openshift-ansible-3.9.31-1.git.34.154617d.el7")) flag++;
  if (rpm_exists(rpm:"openshift-ansible-docs-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"openshift-ansible-docs-3.9.31-1.git.34.154617d.el7")) flag++;
  if (rpm_exists(rpm:"openshift-ansible-playbooks-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"openshift-ansible-playbooks-3.9.31-1.git.34.154617d.el7")) flag++;
  if (rpm_exists(rpm:"openshift-ansible-roles-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"openshift-ansible-roles-3.9.31-1.git.34.154617d.el7")) flag++;
  if (rpm_exists(rpm:"prometheus-node-exporter-3.9", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"prometheus-node-exporter-3.9.31-1.git.890.a55de06.el7")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "atomic-openshift / atomic-openshift-clients / etc");
  }
}

Redhat

advisories
rhsa
idRHSA-2018:2013
rpms
  • atomic-openshift-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-clients-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-clients-redistributable-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-cluster-capacity-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-descheduler-0:3.9.13-1.git.267.bb59a3f.el7
  • atomic-openshift-docker-excluder-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-dockerregistry-0:3.9.31-1.git.351.1bd46ed.el7
  • atomic-openshift-excluder-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-federation-services-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-master-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-node-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-node-problem-detector-0:3.9.13-1.git.167.5d6b0d4.el7
  • atomic-openshift-pod-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-sdn-ovs-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-service-catalog-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-template-service-broker-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-tests-0:3.9.31-1.git.0.ef9737b.el7
  • atomic-openshift-utils-0:3.9.31-1.git.34.154617d.el7
  • atomic-openshift-web-console-0:3.9.31-1.git.246.bded6a4.el7
  • mysql-apb-role-0:1.1.11-1.el7
  • openshift-ansible-0:3.9.31-1.git.34.154617d.el7
  • openshift-ansible-docs-0:3.9.31-1.git.34.154617d.el7
  • openshift-ansible-playbooks-0:3.9.31-1.git.34.154617d.el7
  • openshift-ansible-roles-0:3.9.31-1.git.34.154617d.el7
  • prometheus-node-exporter-0:3.9.31-1.git.890.a55de06.el7

References