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1. #Subdomain login lastpass how to#
2. #Subdomain login lastpass code#
3. #Subdomain login lastpass password#
4. #Subdomain login lastpass series#

You can easily expand your scope by inspecting source code and mapping out all the hosts that the target relies on. The reason why I wanted to list this issue in this guide, is to highlight the fact that, as a hacker, I do not want to only restrict myself to subdomains on the target host.

Hijacking a host that is used somewhere on the page can ultimately lead to stored cross-site scripting, since the adversary can load arbitrary client-side code on the target page. This means that a resource is being imported on the target page, for example, via a blob of JavaScript and the hacker can claim the subdomain from which the resource is being imported. Second-order subdomain takeovers, what I like to refer to as " broken link hijacking", are vulnerable subdomains which do not necessarily belong to the target but are used to serve content on the target's website. For demonstration purposes, the index page now displays a picture of a frog. Once the custom subdomain has been added to our GitHub project, we can see that the contents of the repository are served on - we have successfully claimed the subdomain. Some application types require you to check both HTTP and HTTPS responses for takeovers and others may not be vulnerable at all. Please note that this does not indicate that a takeover is possible on all applications. This 404 page indicates that no content is being served under the top-level directory and that we should attempt to add this subdomain to our personal GitHub repository. Most hackers' senses start tingling at this point. When navigating to, we discover the following 404 error page. We can determine this by reviewing the subdomain's DNS records in this example, has multiple A records pointing to GitHub's dedicated IP addresses for custom pages. While enumerating all of the subdomains belonging to - a process that we will explore later - a hacker stumbles across, a subdomain pointing to GitHub pages. For this scenario, let us assume that is the target and that the team running have a bug bounty programme. If you have never performed a subdomain takeover before or would like a fresh introduction, I have devised an example scenario to help explain the basics.

#Subdomain login lastpass how to#

This article assumes that the reader has a basic understanding of the Domain Name System (DNS) and knows how to set up a subdomain. My goal today is to create an overall guide to understanding, finding, exploiting, and reporting subdomain misconfigurations. As a hacker and a security analyst, I deal with this type of issue on a daily basis. The basic premise of a subdomain takeover is a host that points to a particular service not currently in use, which an adversary can use to serve content on the vulnerable subdomain by setting up an account on the third-party service.

#Subdomain login lastpass series#

Since Detectify's fantastic series on subdomain takeovers, the bug bounty industry has seen a rapid influx of reports concerning this type of issue.

#Subdomain login lastpass password#

Because of that, it’s vulnerable to “Stealing Credentials From Password Manager by Abusing Autofill Function via Compromised Subdomain” (I’m open to name suggestions) Attack Stepsġ) Target uses Lastpass for his/her Linode account:Ģ) Attacker starts a server on Linode and creates a page with a login form with the same elements on linode.HackerOne's Hacktivity feed - a curated feed of publicly-disclosed reports - has seen its fair share of subdomain takeover reports. Linode provides us a reverse dns which is a subdomain of the domain. I started a server on Linode and checked the details:

Digitalocean is not providing reverse dns (boo!), therefore I tried my luck with Linode. I checked my AWS and Azure accounts quickly.ĪWS: main domain –> / reverse dns domain –> Īzure: main domain –> / reverse dns domain –> This is another risk factor for subdomain takeover vulnerabilities.īut wait a minute, what if the website provides us a subdomain itself? Like cloud companies who provides a reverse dns for user created servers. If a subdomain of is compromised, an attacker can steal user credentials by tricking them to navigate to compromised subdomain. I shouldn’t write my password again and again for different subdomains such as, etc.īut there is a catch. Which means, when I use a password for, my password manager will also fill too. After a while, I realized that the most popular password managers such as Lastpass, 1password, Dashlane are supporting form autofill on subdomains by default. I was trying to find an anomaly on popular password managers. Now, Linode security team discussing the issue internally. Update2: Linode security team explained me that the initial assessment was done by HackerOne triage team. Update: Linode security team said they reopened the issue.