Vulnerabilities > CVE-2019-1002101 - Link Following vulnerability in multiple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
HIGH Availability impact
NONE Summary
The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes creates a tar inside the container, copies it over the network, and kubectl unpacks it on the user’s machine. If the tar binary in the container is malicious, it could run any code and output unexpected, malicious results. An attacker could use this to write files to any path on the user’s machine when kubectl cp is called, limited only by the system permissions of the local user. The untar function can both create and follow symbolic links. The issue is resolved in kubectl v1.11.9, v1.12.7, v1.13.5, and v1.14.0.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Symlink Attack An attacker positions a symbolic link in such a manner that the targeted user or application accesses the link's endpoint, assuming that it is accessing a file with the link's name. The endpoint file may be either output or input. If the file is output, the result is that the endpoint is modified, instead of a file at the intended location. Modifications to the endpoint file may include appending, overwriting, corrupting, changing permissions, or other modifications. In some variants of this attack the attacker may be able to control the change to a file while in other cases they cannot. The former is especially damaging since the attacker may be able to grant themselves increased privileges or insert false information, but the latter can also be damaging as it can expose sensitive information or corrupt or destroy vital system or application files. Alternatively, the endpoint file may serve as input to the targeted application. This can be used to feed malformed input into the target or to cause the target to process different information, possibly allowing the attacker to control the actions of the target or to cause the target to expose information to the attacker. Moreover, the actions taken on the endpoint file are undertaken with the permissions of the targeted user or application, which may exceed the permissions that the attacker would normally have.
- Accessing, Modifying or Executing Executable Files An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
- Leverage Executable Code in Non-Executable Files An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
- Manipulating Input to File System Calls An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
Nessus
NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2019-1632.NASL description An update for atomic-openshift is now available for OpenShift Container Platform. Red Hat Product Security has rated this update as having a security impact of Moderate. 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 Red Hat last seen 2020-06-01 modified 2020-06-02 plugin id 126322 published 2019-06-28 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/126322 title RHEL 7 : Red Hat OpenShift Container Platform 3.10 atomic-openshift (RHSA-2019:1632) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Red Hat Security Advisory RHSA-2019:1632. The text # itself is copyright (C) Red Hat, Inc. # include("compat.inc"); if (description) { script_id(126322); script_version("1.6"); script_cvs_date("Date: 2020/01/09"); script_cve_id("CVE-2019-11246"); script_xref(name:"RHSA", value:"2019:1632"); script_name(english:"RHEL 7 : Red Hat OpenShift Container Platform 3.10 atomic-openshift (RHSA-2019:1632)"); 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: "An update for atomic-openshift is now available for OpenShift Container Platform. Red Hat Product Security has rated this update as having a security impact of Moderate. 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 Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. Security Fix(es) : * kubernetes: Incomplete fix for CVE-2019-1002101 allows for arbitrary file write via `kubectl cp` (CVE-2019-11246) 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." ); script_set_attribute( attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2019:1632" ); script_set_attribute( attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2019-11246" ); script_set_attribute(attribute:"solution", value:"Update the affected packages."); script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N"); 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:R/S:U/C:N/I:H/A:N"); 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-docker-excluder"); 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-hyperkube"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-hypershift"); 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-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-template-service-broker"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:atomic-openshift-tests"); script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7"); script_set_attribute(attribute:"vuln_publication_date", value:"2019/08/29"); script_set_attribute(attribute:"patch_publication_date", value:"2019/06/27"); script_set_attribute(attribute:"plugin_publication_date", value:"2019/06/28"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2019-2020 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-2019:1632"; yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa); if (!empty_or_null(yum_report)) { security_report_v4( port : 0, severity : SECURITY_WARNING, 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-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-clients-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-clients-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-clients-redistributable-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-clients-redistributable-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-docker-excluder-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"atomic-openshift-docker-excluder-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-excluder-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", reference:"atomic-openshift-excluder-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-hyperkube-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-hyperkube-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-hypershift-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-hypershift-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-master-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-master-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-node-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-node-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-pod-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-pod-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-sdn-ovs-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-sdn-ovs-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-template-service-broker-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-template-service-broker-3.10.149-1.git.0.05de590.el7")) flag++; if (rpm_exists(rpm:"atomic-openshift-tests-3.10", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"atomic-openshift-tests-3.10.149-1.git.0.05de590.el7")) flag++; if (flag) { security_report_v4( port : 0, severity : SECURITY_WARNING, 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"); } }NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_6A0129BF54AD11E9987C1C39475B9F84.NASL description Kubernetes.io reports : A security issue was discovered with the Kubernetes kubectl cp command that could enable a directory traversal replacing or deleting files on a user last seen 2020-06-01 modified 2020-06-02 plugin id 123574 published 2019-04-02 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123574 title FreeBSD : Kubectl -- Potential directory traversal (6a0129bf-54ad-11e9-987c-1c39475b9f84) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2019-3811.NASL description An update for atomic-openshift is now available for Red Hat OpenShift Container Platform 3.9. 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 Red Hat last seen 2020-06-01 modified 2020-06-02 plugin id 130747 published 2019-11-08 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130747 title RHEL 7 : OpenShift Container Platform 3.9 atomic-openshift (RHSA-2019:3811) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2019-1852.NASL description An update for atomic-openshift is now available for Red Hat OpenShift Container Platform 3.9. Red Hat Product Security has rated this update as having a security impact of Moderate. 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 Red Hat last seen 2020-06-01 modified 2020-06-02 plugin id 127033 published 2019-07-25 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/127033 title RHEL 7 : OpenShift Container Platform 3.9 atomic-openshift (RHSA-2019:1852) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2019-1633.NASL description An update for atomic-openshift is now available for OpenShift Container Platform 3.11. Red Hat Product Security has rated this update as having a security impact of Moderate. 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 seen 2020-06-01 modified 2020-06-02 plugin id 126323 published 2019-06-28 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/126323 title RHEL 7 : Red Hat OpenShift Container Platform 3.11 atomic-openshift (RHSA-2019:1633) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2019-3239.NASL description An update for atomic-openshift is now available for Red Hat OpenShift Container Platform 3.10. 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 Red Hat last seen 2020-06-01 modified 2020-06-02 plugin id 130384 published 2019-10-30 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130384 title RHEL 7 : OpenShift Container Platform 3.10 atomic-openshift (RHSA-2019:3239) NASL family Misc. NASL id KUBERNETES_1_13_5_DIRECTORY_TRAVERSAL.NASL description The version of Kubernetes installed on the remote host is version 1.11.x prior to 1.11.9, 1.12.x prior to 1.12.7 or 1.13.x prior to 1.13.5. It is, therefore, affected by a directory traversal vulnerability in the kubectl cp command due to mishandling of symlinks when copying files from a running container. An unauthenticated, remote attacker can exploit this, by convincing a user to use kubectl cp with a malicious container to overwrite arbitrary files on the remote host. last seen 2020-06-01 modified 2020-06-02 plugin id 128650 published 2019-09-11 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/128650 title Kubernetes 1.11.x < 1.11.9 / 1.12.x < 1.12.7 / 1.13.x < 1.13.5 kubectl directory traversal NASL family Fedora Local Security Checks NASL id FEDORA_2019-2B8EF08C95.NASL description Update to v1.15.2 + carry upstream #81330 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 128127 published 2019-08-26 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/128127 title Fedora 30 : kubernetes (2019-2b8ef08c95)
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References
- https://access.redhat.com/errata/RHBA-2019:0620
- https://access.redhat.com/errata/RHBA-2019:0619
- https://access.redhat.com/errata/RHBA-2019:0636
- http://www.openwall.com/lists/oss-security/2019/06/21/1
- http://www.openwall.com/lists/oss-security/2019/08/05/5
- https://www.twistlock.com/labs-blog/disclosing-directory-traversal-vulnerability-kubernetes-copy-cve-2019-1002101/
- https://github.com/kubernetes/kubernetes/pull/75037
- http://www.securityfocus.com/bid/107652
- https://access.redhat.com/security/cve/cve-2019-1002101
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BPV2RE5RMOGUVP5WJMXKQJZUBBLAFZPZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QZB7E3DOZ5WDG46XAIU6K32CXHXPXB2F/