CVE-2022-21671 Potential exposure of Replit tokens to an Unauthorized Actor in @replit/crosis
An attacker can intercept Replit tokens via a misconfigured fallback proxy URL, leading to full compromise of the associated Repl.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-21671?
CVE-2022-21671 is a high-severity vulnerability in replit crosis, published on 11 Jan 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
@replit/crosis is a JavaScript client that speaks Replit's container protocol. A vulnerability that involves exposure of sensitive information exists in versions prior to 7.3.1. When using this library as a way to programmatically communicate with Replit in a standalone fashion, if there are multiple failed attempts to contact Replit through a WebSocket, the library will attempt to communicate using a fallback poll-based proxy. The URL of the proxy has changed, so any communication done to the previous URL could potentially reach a server that is outside of Replit's control and the token used to connect to the Repl could be obtained by an attacker, leading to full compromise of that Repl (not of the account). This was patched in version 7.3.1 by updating the address of the fallback WebSocket polling proxy to the new one. As a workaround, a user may specify the new address for the polling host (`gp-v2.replit.com`) in the `ConnectArgs`. More information about this workaround is available in the GitHub Security Advisory.
Weakness: CWE-200
Which versions are affected by CVE-2022-21671?
2 open source packages ship an affected version, including @replit/crosis. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@replit/crosis npm | All versions | 7.3.1 |
@replit/crosis npm | All versions | 7.3.1 |
Products include Replit Crosis.
How do I fix CVE-2022-21671?
Upgrade @replit/crosis to 7.3.1 or later.
Is CVE-2022-21671 being exploited?
There is no known exploitation of CVE-2022-21671 in the wild and no public exploit code.
Sources
Also known as GHSA-7w54-gp8x-f33m.