CVE-2021-41101

CORS `Access-Control-Allow-Origin` settings are too lenient

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).

Category

5.7
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.31%
Third-Party Advisory github.com
Affected: wireapp wire-server
Published at:
Updated at:

References

Link Tags
https://github.com/wireapp/wire-server/security/advisories/GHSA-v7xx-cx8m-g66p third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-41101?
CVE-2021-41101 has been scored as a medium severity vulnerability.
How to fix CVE-2021-41101?
To fix CVE-2021-41101, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-41101 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-41101 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-41101?
CVE-2021-41101 affects wireapp wire-server.
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