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CVE-2021-21323— Regression in DNS leakage from Tor windows

Quick assessment

Affected
brave brave-browser
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.

Francois Marier Brave Core是GlobalFrancois Marier开源的一个应用程序提供一组更改，API和脚本，用于自定义Chromium以创建Brave Brave versions 1.17.73-1.20.103 存在安全漏洞，该漏洞源于CNAME adblocking意外引发了绕过Brave Tor代理的DNS请求。

CVSS 4.3 · Medium EPSS 2.26% · P82
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I. Basic Information for CVE-2021-21323

Vulnerability Information
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Vulnerability Title
Regression in DNS leakage from Tor windows
Source: CVE Program / CVE List V5
Vulnerability Description
Brave is an open source web browser with a focus on privacy and security. In Brave versions 1.17.73-1.20.103, the CNAME adblocking feature added in Brave 1.17.73 accidentally initiated DNS requests that bypassed the Brave Tor proxy. Users with adblocking enabled would leak DNS requests from Tor windows to their DNS provider. (DNS requests that were not initiated by CNAME adblocking would go through Tor as expected.) This is fixed in Brave version 1.20.108
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Brave 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Francois Marier Brave Core是GlobalFrancois Marier开源的一个应用程序提供一组更改，API和脚本，用于自定义Chromium以创建Brave Brave versions 1.17.73-1.20.103 存在安全漏洞，该漏洞源于CNAME adblocking意外引发了绕过Brave Tor代理的DNS请求。
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
brave brave-browser >= 1.17.73, < 1.20.108 -

II. Public POCs for CVE-2021-21323

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III. Intelligence Information for CVE-2021-21323

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Patches & Fixes for CVE-2021-21323 (2)

Vendor Advisories for CVE-2021-21323 (1)

Other References for CVE-2021-21323 (2)

IV. Related Vulnerabilities

Same vendor: brave
Same weakness: CWE-200

V. Comments for CVE-2021-21323

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