CVE-2021-21323

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Summary

CVECVE-2021-21323
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-02-23 23:15:00 UTC
Updated2021-03-01 16:14:00 UTC
DescriptionBrave 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

Risk And Classification

Problem Types: CWE-200

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Brave Brave All All All All

References

ReferenceSourceLinkTags
Fix Tor dns leak by darkdh · Pull Request #7769 · brave/brave-core · GitHub MISC github.com Patch, Third Party Advisory
Regression in DNS leakage from Tor windows · Advisory · brave/brave-browser · GitHub CONFIRM github.com Third Party Advisory
HackerOne MISC hackerone.com Permissions Required, Third Party Advisory
[hackerone] Tor DNS issue · Issue #13527 · brave/brave-browser · GitHub MISC github.com Patch, Third Party Advisory
Merge pull request #7769 from brave/tor-dns-leak · brave/brave-core@12fe321 · GitHub MISC github.com Patch, Third Party Advisory
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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