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Can I escalate a main domain SSTI/RCE to all the subdomains belonging to that domain? BUG BOUNTY QUESTION

Can I escalate a main domain SSTI/RCE to all the subdomains belonging to that domain? 

Asked On2022-02-28 15:51:57 by:Sheethal-

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As you should know, "subdomains" means that the IP addresses assigned to these subdomains may be different (although it's not mandatory). Imagine an fictional "mastercard.com" website that has the subdomain "us.mastercard.com" for US, "ru.mastercard.com" for Russia, "ae.mastercard.com" for UAE and so on. Each and every of these subdomains might be having a different IP address, different infrastructure (OS / web server), and even different technological stack (one domain might have content which is dynamically generated by PHP, and another may have static HTML content). This is actually quite a common case, especially for huge international corporations or franchise businesses, when different countries / business branches are acting independently on their own behalf.

On the other side, subdomain can be hosted on the same web server, maintained by the same team, and developed using the same code base as the top-level domain. This is also something that is quite widespread.

Of course, it is absolutely clear that in the first case you will not be able to reproduce your exploit on the subdomain, while in the second one you might stand a big chance doing so.

Unfortunately, your question lacks important details to address your situation in particular. So, I suggest you start from determining whether your subdomains are actually hosted on the same infrastructure, and using the same technological stack (if you're lucky, some fingerprinting techniques will help you here). If all looks different - your chances are really slim. If everything is the same - then you should try to exploit again and again and again, researching and adapting your attempts, as in any pentest. And if you discover that all the subdomains point towards the same server and same port as the main website - then most probably they are served by one server, and executing command on it (which you can do already) might be accepted as finding (just prove that you can view / modify the information related to the subdomains in scope). There are some legal risks here, probably, that require attention - but if the company is running bug bounty program, I would expect they have at least some common sense.

Answerd on:2022-03-07 Answerd By:Raj-Gupta

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