> I wasn't aware that plaintext was one of the whitelisted types that are allowed without a preflight request.
Until now, I wasn't aware of that either. My response is about the fact you can massage the plaintext part to contain valid JSON somehow being a problem, one that apparently is a security issue in practice.
We're not talking about some clever polyglot quine like those COM executables that are somehow also valid Bash and C code and PDF files or something. text/plain is a superset of everything that can be represented by plain text, which includes approximately all code and data formats, JSON and XML included.
> And this wouldn't be the first time, protocols are made intentionally incompatible on the wire, so an attacker can't smuggle one inside the other.
I need to learn more about it, thanks for pointing it out.
Though at the surface, it reads to me like removing a feature. "Smuggling a protocol inside the other" sounds to me like an important feature, or perhaps more accurately, I find myself being part of the "attacker" population much more often than not. "Tunnel $whatever through HTTPS because corporate/ISP firewalls" is both a meme and success story for plenty a SaaS at this point.
Until now, I wasn't aware of that either. My response is about the fact you can massage the plaintext part to contain valid JSON somehow being a problem, one that apparently is a security issue in practice.
We're not talking about some clever polyglot quine like those COM executables that are somehow also valid Bash and C code and PDF files or something. text/plain is a superset of everything that can be represented by plain text, which includes approximately all code and data formats, JSON and XML included.
> And this wouldn't be the first time, protocols are made intentionally incompatible on the wire, so an attacker can't smuggle one inside the other.
I need to learn more about it, thanks for pointing it out.
Though at the surface, it reads to me like removing a feature. "Smuggling a protocol inside the other" sounds to me like an important feature, or perhaps more accurately, I find myself being part of the "attacker" population much more often than not. "Tunnel $whatever through HTTPS because corporate/ISP firewalls" is both a meme and success story for plenty a SaaS at this point.