CVE-2021-21323

Summary

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

Affected Software

Weaknesses

• CWE-200: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6
• https://github.com/brave/brave-browser/issues/13527
• https://github.com/brave/brave-core/pull/7769
• https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15
• https://hackerone.com/reports/1077022

References

• https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6
• https://github.com/brave/brave-browser/issues/13527
• https://github.com/brave/brave-core/pull/7769
• https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15
• https://hackerone.com/reports/1077022

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