Thank you for letting us know.

~slg

-------- Original Message --------
On Jul 19, 2021, 2:35 PM, Sam Tobin-Hochstadt wrote:

> The Racket team recently became aware of a security vulnerability in
> the `racket/sandbox` library. Code evaluated using a sandbox could
> cause system modules to incorrectly use attacker-created modules
> instead of their intended dependencies. This could allow system
> functions to be controlled by the attacker, giving access to
> facilities intended to be restricted.
>
> The official advisory is at
> https://github.com/racket/racket/security/advisories/GHSA-cgrw-p7p7-937c
>
> To address this vulnerability, anyone who uses a sandbox to evaluate
> untrusted code should upgrade to version 8.2. This includes all uses
> of the Handin server.
>
> For users of the Handin server, it now provides an API to restrict
> `require`s for uses of teaching languages. We strongly encourage using
> this API [1], which can prevent exploiting this bug as well as other
> problems that access to full Racket or other installed modules might
> expose.
>
> Feedback on this advisory, and any security issues discovered in
> Racket, is welcome at secur...@racket-lang.org
>
> [1] the `#:requires` argument to `make-evaluator`, or the `requires`
> arguments to `make-evaluator/submission` and similar.
>
> Sam, for the Racket team
>
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