GHSA-hrqr-jv8w-v9jh
Insufficient permission checking in `Deno.makeTemp*` APIs
Details
### Impact
Insufficient validation of parameters in `Deno.makeTemp*` APIs would allow for creation of files outside of the allowed directories. This may allow the user to overwrite important files on the system that may affect other systems.
A user may provide a prefix or suffix to a `Deno.makeTemp*` API containing path traversal characters. The permission check would prompt for the base directory of the API, but the final file that was created would be outside of this directory:
``` $ mkdir /tmp/good $ mkdir /tmp/bad $ deno repl --allow-write=/tmp/good > Deno.makeTempFileSync({ dir: "/tmp/bad" }) ┌ ⚠️ Deno requests write access to "/tmp/bad". ├ Requested by `Deno.makeTempFile()` API. ├ Run again with --allow-write to bypass this prompt. └ Allow? [y/n/A] (y = yes, allow; n = no, deny; A = allow all write permissions) > n ❌ Denied write access to "/tmp/bad". Uncaught PermissionDenied: Requires write access to "/tmp/bad", run again with the --allow-write flag at Object.makeTempFileSync (ext:deno_fs/30_fs.js:176:10) at <anonymous>:1:27 > Deno.makeTempFileSync({ dir: "/tmp/good", prefix: "../bad/" }) "/tmp/good/../bad/a9432ef5" $ ls -l /tmp/bad/a9432ef5 -rw-------@ 1 user group 0 Mar 4 09:20 /tmp/bad/a9432ef5 ```
### Patches
This is fixed in Deno 1.41.1.
Are you affected?
Enter the version of the package you're using.
Affected packages
0Fixed in: 1.41.1Upgrade deno to 1.41.1 or newer (ecosystem crates.io).