CVE-2022-21671 Potential exposure of Replit tokens to an Unauthorized Actor in @replit/crosis

2022-01-1115:05:11

CWE-200

GitHub_M

www.cve.org

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

8.1 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

27.2%

JSON

@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.

CNA Affected

[
  {
    "product": "crosis",
    "vendor": "replit",
    "versions": [
      {
        "status": "affected",
        "version": "< 7.3.1"
      }
    ]
  }
]