CVE-2023-22466 — Tokio's reject_remote_clients configuration may get dropped when creating a Windows named pipe

Affected: tokio-rs tokio

Tokio is a runtime for writing applications with Rust. Starting with version 1.7.0 and prior to versions 1.18.4, 1.20.3, and 1.23.1, when configuring a Windows named pipe server, setting `pipe_mode` will reset `reject_remote_clients` to `false`. If the application has previously configured `reject_remote_clients` to `true`, this effectively undoes the configuration. Remote clients may only access the named pipe if the named pipe's associated path is accessible via a publicly shared folder (SMB). Versions 1.23.1, 1.20.3, and 1.18.4 have been patched. The fix will also be present in all releases starting from version 1.24.0. Named pipes were introduced to Tokio in version 1.7.0, so releases older than 1.7.0 are not affected. As a workaround, ensure that `pipe_mode` is set first after initializing a `ServerOptions`.

GHSA-7rrj-xr53-82p7 — Tokio reject_remote_clients configuration may get dropped when creating a Windows named pipe

Affected: crates.io: tokio

### Impact

When configuring a Windows named pipe server, setting `pipe_mode` will reset `reject_remote_clients` to `false`. If the application has previously configured `reject_remote_clients` to `true`, this effectively undoes the configuration. This also applies if `reject_remote_clients` is not explicitly set as this is the default configuration and is cleared by calling `pipe_mode`.

Remote clients may only access the named pipe if the named pipe's associated path is accessible via a publically shared folder (SMB).

### Patches

The following versions have been patched: * 1.23.1 * 1.20.3 * 1.18.4

The fix will also be present in all releases starting from version 1.24.0.

Named pipes were introduced to Tokio in version 1.7.0, so releases older than 1.7.0 are not affected.

### Workarounds

Ensure that `pipe_mode` is set **first** after initializing a `ServerOptions`. For example:

```rust let mut opts = ServerOptions::new(); opts.pipe_mode(PipeMode::Message); opts.reject_remote_clients(true); ```

### References

https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea#pipe_reject_remote_clients

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CVE-2023-22466 — Tokio's reject_remote_clients configuration may get dropped when creating a Windows named pipe

GHSA-7rrj-xr53-82p7 — Tokio reject_remote_clients configuration may get dropped when creating a Windows named pipe