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CVE-2021-41101— CORS `Access-Control-Allow-Origin` settings are too lenient

Quick assessment

Affected
wireapp wire-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wire是个人开发者的一款聊天软件。该软件支持 Web、WindowsiOS、Android、OS X 平台，有群组功能，可以语音通话，发送照片以及其独创性的打招呼方式 PING。 Wire Wire-server 存在跨站脚本漏洞，如果有人要在任何子域中找到 XSS 向量，他们可以使用它来使用用户的 Cookie 与 Wire API 对话。

CVSS 5.7 · Medium EPSS 0.71% · P52

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process
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I. Basic Information for CVE-2021-41101

Vulnerability Information
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Vulnerability Title
CORS `Access-Control-Allow-Origin` settings are too lenient
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Wire 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wire是个人开发者的一款聊天软件。该软件支持 Web、WindowsiOS、Android、OS X 平台，有群组功能，可以语音通话，发送照片以及其独创性的打招呼方式 PING。 Wire Wire-server 存在跨站脚本漏洞，如果有人要在任何子域中找到 XSS 向量，他们可以使用它来使用用户的 Cookie 与 Wire API 对话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wireapp wire-server < 2.106.0 -

II. Public POCs for CVE-2021-41101

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III. Intelligence Information for CVE-2021-41101

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Vendor Advisories for CVE-2021-41101 (1)

IV. Related Vulnerabilities

Same product: wire-server
Same vendor: wireapp
Same weakness: CWE-79

V. Comments for CVE-2021-41101

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