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CVE

CWE

Training

CVE-2021-21323

Published: Feb 23, 2021

Modified: Aug 3, 2024

PUBLISHED

CVSS v3.1

4.3

MEDIUM

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

Vendor	Product	Versions
brave	brave-browser	affected `>= 1.17.73, < 1.20.108`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

References

https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6

x_refsource_CONFIRM

https://github.com/brave/brave-browser/issues/13527

x_refsource_MISC

https://github.com/brave/brave-core/pull/7769

x_refsource_MISC

https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15

x_refsource_MISC

https://hackerone.com/reports/1077022

x_refsource_MISC

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