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
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected products
- Brave / brave-browser>= 1.17.73, < 1.20.108 – >= 1.17.73, < 1.20.108
References
- VENDOR_ADVISORYhttps://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6
- MISChttps://github.com/brave/brave-browser/issues/13527
- PATCHhttps://github.com/brave/brave-core/pull/7769
- PATCHhttps://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15
- MISChttps://hackerone.com/reports/1077022