CVE-2021-21323— Regression in DNS leakage from Tor windows
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/brave/brave-core/pull/7769x_refsource_MISC
- https://github.com/brave/brave-browser/issues/13527x_refsource_MISC
- https://hackerone.com/reports/1077022x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-21323
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V. Comments for CVE-2021-21323
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