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Regression in DNS leakage from Tor windows

High
diracdeltas published GHSA-mqjf-9x5g-2rv6 Feb 20, 2021

Package

Brave Browser Desktop

Affected versions

1.17.73-1.20.103

Patched versions

1.20.108

Description

Impact

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.)

Patches

1.20.108

References

#13527

For more information

If you have any questions or comments about this advisory, email us at [email protected]. If you would like to report a security issue, please open one at https://hackerone.com/brave.

Severity

High

CVE ID

CVE-2021-21323

Weaknesses

No CWEs