Unrated severityNVD Advisory· Published Feb 23, 2021· Updated Aug 3, 2024
Regression in DNS leakage from Tor windows
CVE-2021-21323
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
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Affected products
2Patches
Vulnerability mechanics
References
5- github.com/brave/brave-browser/issues/13527mitrex_refsource_MISC
- github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6mitrex_refsource_CONFIRM
- github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15mitrex_refsource_MISC
- github.com/brave/brave-core/pull/7769mitrex_refsource_MISC
- hackerone.com/reports/1077022mitrex_refsource_MISC
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