GHSA-3227-r97m-8j95 Relative Path Traversal in afire serve_static

Not scored Published 22 Apr 2022

An attacker can read arbitrary files outside the web root via path traversal in the afire serve_static extension.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is GHSA-3227-r97m-8j95?

GHSA-3227-r97m-8j95 is a path traversal vulnerability in afire, published on 22 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Impact

This vulnerability effects the built-in afire serve_static extension allowing paths containing //.... to bypass the previous path sanitation and request files in higher directories that should not be accessible.

Patches

The issue has been fixed in afire 1.1.0. If you can, just update to the newest version of afire.

Workarounds

If you can't update afire you can simply disallow paths containing /.. with the following middleware. Make sure this is the last middleware added to the server so it runs first, stopping the bad requests.

use afire::prelude::*;

struct PathTraversalFix;

impl Middleware for PathTraversalFix {
    fn pre(&amp;self, req: Request) -&gt; MiddleRequest {
        if req.path.replace(&#34;\\&#34;, &#34;/&#34;).contains(&#34;/..&#34;) {
            return MiddleRequest::Send(
                Response::new()
                    .status(400)
                    .text(&#34;Paths containing `..` are not allowed&#34;),
            );
        }

        MiddleRequest::Continue
    }
}

let mut server = Server::new(host, port);
PathTraversalFix.attach(&amp;mut server);

References

You can read about the new changes to afire in 1.1.0 here

For more information

If you have any questions or comments about this advisory you can email me or message me on discord. [https://connorcode.com/contact]

Which versions are affected by GHSA-3227-r97m-8j95?

2 open source packages ship an affected version, including afire.

Package	Affected	Fixed in
`afire` crates.io	From `0.2.1`	`1.1.0`
`afire` crates.io	From `0.2.1`	`1.1.0`

How do I fix GHSA-3227-r97m-8j95?

Upgrade afire to 1.1.0 or later.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is GHSA-3227-r97m-8j95 being exploited?

There is no known exploitation of GHSA-3227-r97m-8j95 in the wild and no public exploit code.