Netskope es nombrado líder en el Cuadrante Mágico™ de Gartner 2022 para Security Service Edge. Obtenga el informe

  • Productos

    Los productos de Netskope se basan en Netskope Security Cloud.

  • Plataforma

    Visibilidad inigualable y protección contra amenazas y datos en tiempo real en la nube privada de seguridad más grande del mundo.

Netskope ha sido nombrado Líder en el Informe del Cuadrante Mágico de Gartner™ 2022 en SSE

Obtenga el informe Todos los productos
Líder SSE Netskope gartner mq 2022

Netskope ofrece una estrategia de seguridad cloud moderna, con capacidades unificadas para los datos y protección frente a amenazas, además de un acceso privado seguro.

Explora nuestra plataforma
Vista aérea de una ciudad metropolitana

Cambie a los servicios de seguridad en la nube líderes del mercado con una latencia mínima y una alta fiabilidad.

Más información
Lighted highway through mountainside switchbacks

Prevenga las amenazas que a menudo eluden otras soluciones de seguridad utilizando un marco SSE de un solo paso.

Más información
Lighting storm over metropolitan area

Soluciones de confianza cero para implementaciones de SSE y SASE

Más información
Boat driving through open sea

Netskope hace posible un proceso seguro, rápido y con inteligencia cloud para la adopción de los servicios en la nube, las aplicaciones y la infraestructura de nube pública.

Más información
Wind turbines along cliffside

Confíe en Netskope para que le ayude a hacer frente a las amenazas en evolución, a los nuevos riesgos, a los cambios tecnológicos, a los cambios organizativos y de red, y a los nuevos requisitos normativos.

Más información
Woman smiling with glasses looking out window

Tenemos ingenieros cualificados en todo el mundo, con distintos ámbitos de conocimiento sobre seguridad en la nube, redes, virtualización, entrega de contenidos y desarrollo de software, listos para ofrecerle asistencia técnica de calidad en todo momento.

Más información Support Portal
Bearded man wearing headset working on computer

Asegure su viaje de transformación digital y aproveche al máximo sus aplicaciones en la nube, web y privadas con la capacitación de Netskope.

Más información
Group of young professionals working
  • Recursos

    Obtenga más información sobre cómo Netskope puede ayudarle a proteger su viaje hacia la nube.

  • Blog

    Descubra cómo Netskope permite la transformación de la seguridad y las redes a través del servicio de seguridad (SSE).

  • Eventos & Workshops

    Manténgase a la vanguardia de las últimas tendencias de seguridad y conéctese con sus pares.

  • Security Defined

    Todo lo que necesitas saber en nuestra enciclopedia de ciberseguridad.

Podcast Security Visionaries

Episode 11: Empowering People for a Secure Future

Reproducir el pódcast
Black man sitting in conference meeting

Lea lo último sobre cómo Netskope puede hacer posible el viaje de confianza cero y SASE a través de las capacidades de SSE.

Lea el blog
Sunrise and cloudy sky

Semana SASE

Netskope puede ayudarle a dar los primeros pasos en el mundo SASE y a descubrir qué papel desempeñan en él la seguridad, las conexiones de red y Zero Trust.

Más información
Semana SASE

¿Qué es Security Service Edge (SSE)?

Explore el lado de la seguridad de SASE, el futuro de la red y la protección en la nube.

Más información
Four-way roundabout
  • Empresa

    Le ayudamos a mantenerse a la vanguardia de los desafíos de seguridad de la nube, los datos y la red.

  • Por qué Netskope

    La transformación de la nube y el trabajo desde cualquier lugar han cambiado la forma en que debe funcionar la seguridad.

  • Liderazgo

    Nuestro equipo de liderazgo está firmemente comprometido a hacer todo lo necesario para que nuestros clientes tengan éxito.

  • Partners

    Nos asociamos con líderes en seguridad para ayudarlo a asegurar su viaje a la nube.

Netskope posibilita el futuro del trabajo.

Descubra más
Curvy road through wooded area

Netskope está redefiniendo la seguridad de la nube, los datos y la red para ayudar a las organizaciones a aplicar los principios de Zero Trust para proteger los datos.

Más información
Switchback road atop a cliffside

Pensadores, constructores, soñadores, innovadores. Juntos, ofrecemos soluciones de seguridad en la nube de vanguardia para ayudar a nuestros clientes a proteger sus datos y usuarios.

Conozca a nuestro equipo
Group of hikers scaling a snowy mountain

La estrategia de venta centrada en el partner de Netskope permite a nuestros canales maximizar su expansión y rentabilidad y, al mismo tiempo, transformar la seguridad de su empresa.

Más información
Group of diverse young professionals smiling
Blog Threat Labs Leaky Links: Accidental Exposure in Google Link Sharing
May 01 2020

Leaky Links: Accidental Exposure in Google Link Sharing

Update May 6, 2020: Since the publication of this blog, Google has updated its UI to make the sharing options more clear and be less permissive by default, but the opportunity for exposure is still there and our recommendations still hold. We have updated the “Recommended Settings” section of this post with the new findings.

Netskope Threat Labs recently posted the second entry in our leaky cloud app series about Google Groups. In this edition, we will cover common Google link sharing misconfigurations that can lead to the accidental internal and public exposure of sensitive data, and provide recommendations to prevent such data leaks.

Google link sharing

Google provides its users online office apps like documents (via Google Docs), spreadsheets (via Google Sheets), presentations (via Google Slides), and forms (via Google Forms). All of the files created and edited through these apps are saved to Google Drive, a cloud storage service used to store, synchronize, collaborate, and share files. 

The files stored in Google Drive can be shared by the owner with other users in real time by using a shareable link with the following permissions:

  • Public on the web
    • Anyone in the public Internet can discover and access the shared file.
  • Anyone with the link
    • Anyone with the link can access the shared file.
  • Specific people
    • Only the specific Google accounts can access the shared file.
  • Anyone at Organization can find and access (Business accounts)
    • Everyone in the same organization can discover the file using the search function and access the file.
  • Anyone at Organization who has the link can access (Business accounts)
    • Everyone in the same organization who has the link can access the file.

These shareable link and editing permissions are set by the owner and enable the collaborators to view, comment, or edit the document. 

Google link sharing – Misconfigurations

Misconfigurations in link sharing settings can lead to accidental exposure of sensitive and internal data internally or to the public Internet. We will be detailing some of the most common exposure problems starting with the most public types of accidental exposure and finishing with accidental exposures that occur within an organization.  

Publish to the web and Public on the web – Link sharing

Figure 1 shows the worst kind of link sharing exposure: Publish to the web and Public on the web – link sharing

Figure showing Publish to the web & Public on the web exposure
Figure 1: Publish to the web & Public on the web exposure

The “Publish to the web” and “Link sharing – Public on the web” options make content visible to anyone and indexed by major search engines. This means that not only is the data publicly accessible, it is also easily discoverable by outsiders using keywords in Google search results. We discovered multiple examples of sensitive documents exposed publicly on the web, including one such confidential document of a university that showed up in the Google search results, shown in Figure 2.

Figure showing example of link sharing settings that can lead to exposure
Figure 2: Link sharing setting leading to exposure.

Get shareable link

The next most commonly seen link sharing exposure is “Get shareable link.” This option is most commonly used by the data owners to generate a link that can be shared with their collaborators. The generated links have the default sharing permissions as shown in Figure 3.

Figure showing how to enable "Get a shareable link" action
Figure 3: Get shareable link exposure

Anyone with the link can view → Public exposure

As mentioned in the above image, shared links with “Anyone with the link can view” permissions can be accessed by anyone who has the link, without any need to sign in. Though this won’t make the data indexable by search engines, it can likely pose exposure concerns in the following ways

  • Anyone, inside or outside of your domain, you didn’t intend to share the document with can access the file if they get their hands on the link
  • The user can have access to the shared links even after leaving the organization

Anyone in the organization can find and access→ Internal exposure

The “Anyone in the organization can find and access” sharing option can make the data findable and accessible by anyone in the organization as shown in Figure 4.

Figure depicting the "Anyone in the organization can find and access" option
Figure 4: Anyone in the organization can find and access

This sharing feature can lead to internal exposure because, any user within the organization can gain access to confidential files by using the keywords in the search feature of Google Drive as shown in Figure 5. 

Figure depicting the search function in Google Drive
Figure 5: Search in Google Drive option

An example of one such confidential document that showed up by using “salary” as a keyword in Google Drive search is shown in Figure 6.

Figure depicting the internal exposure of a confidential document within Google Drive
Figure 6: Google Drive internal exposure – confidential document

Google link sharing – Recommended settings

When you use link sharing, you relinquish control over who can access your files — anyone who gets their hands on a link can access a file, whether you intended them to or not. We recommend you audit the sharing permission and limit link sharing with specific people as shown in Figure 7.

Figure depicting how to share links with specific people through Google Drive
Figure 7: Link sharing to specific people

This can give the user a clear visibility on who has access to the shared data. Additionally, users can also hover the mouse to the share option (in Google Docs, Google Sheets, and Google slides) to view the sharing controls. An example of this is shown in Figure 8.

Figure depicting how to see share settings in Google Drive using a mouse hover
Figure 8: Mouse hover – Sharing settings

As mentioned in the introduction, Google updated their UI to make options more clear and be less permissive by default. The new default shareable link is “Restricted,” meaning it allows only the added users to access the data as shown in Figure 9.

Figure showing default shareable link restriction
Figure 9: Default sharable link restriction

Users have to explicitly click on the “change” option to select “anyone with the link” or “anyone in the organization” options, as shown in Figure 10. Additionally, the “Anyone in the organization can find and access” sharing option can only be enabled by explicitly checking the link settings options.

Figure showing updated Google link sharing restriction option
Figure 10: Updated Google link sharing restriction option

Even with the less permissive defaults and new interface, the opportunity for exposure exists and our recommendations still hold.

Conclusiones

This third edition of our leaky cloud apps series provided a detailed synopsis of how confidential information gets leaked through misconfigured Google link sharing. The data created/stored in Google Drive is private by default. Misconfigured sharing controls are in place, which can lead to public or internal exposure. The data can be copied, reused, and also benefit adversaries in gaining access to additional data and infrastructure. We recommend auditing link sharing options and restricting access to specific users to avoid accidental exposure. For more information about sharing permissions, we recommend reading the Google article describing how to audit your own settings.

author image
Acerca del autor
Ashwin Vamshi es un investigador de seguridad con un interés innato en los ataques dirigidos y el malware que utilizan servicios en la nube. Se centra principalmente en la identificación de nuevos vectores de ataque y malware, campañas y ciber-delincuentes que utilizan la "nube como vector de ataque".
Ashwin Vamshi es un investigador de seguridad con un interés innato en los ataques dirigidos y el malware que utilizan servicios en la nube. Se centra principalmente en la identificación de nuevos vectores de ataque y malware, campañas y ciber-delincuentes que utilizan la "nube como vector de ataque".