Vulnerability · Published Sep 30, 2021 · Assigned by GitHub_M
CVE-2021-41101CORS `Access-Control-Allow-Origin` settings are too lenient
Medium 5.7
In plain English
A medium-severity cross-site scripting in wire-server from wireapp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official description
wire-server is an open-source back end for Wire, a secure collaboration platform. Before version 2.106.0, the CORS ` Access-Control-Allow-Origin ` header set by `nginz` is set for all subdomains of `.wire.com` (including `wire.com`). This means that if somebody were to find an XSS vector in any of the subdomains, they could use it to talk to the Wire API using the user's Cookie. A patch does not exist, but a workaround does. To make sure that a compromise of one subdomain does not yield access to the cookie of another, one may limit the `Access-Control-Allow-Origin` header to apps that actually require the cookie (account-pages, team-settings and the webapp).
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| wireapp | wire-server | < 2.106.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
References
- https://github.com/wireapp/wire-server/security/advisories/GHSA-v7xx-cx8m-g66p x_refsource_CONFIRM