Bypassing LSA Protection in Userland

In 2018, James Forshaw published an article in which he briefly mentioned a trick that could be used to inject arbitrary code into a PPL as an administrator. However, I feel like this post did not get the attention it deserved as it literally described a potential Userland exploit for bypassing PPL (which includes LSA Protection).

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Combining Request Smuggling and CBC Byte-flipping to stored-XSS

During a recent penetration test we stumbled upon a couple of issues which independently might not have warranted any attention, but when combined allowed to compromise other users by injecting arbitrary JavaScript into their browsers. It goes to show that even certain issues which might not always seem particularly interesting (such as self-XSS) can sometimes be exploited in meaningful ways. I’ll keep this mostly theoretical so as not to divulge any information on the actual targeted system.

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