Richard Pospesel pushed to branch tor-browser-102.8.0esr-12.0-1 at The Tor Project / Applications / Tor Browser

Commits: 07121bec by hackademix at 2023-02-15T18:38:54+00:00 amend! Bug 8324: Prevent DNS proxy bypasses caused by Drag&Drop

Bug 8324: Prevent DNS proxy bypasses caused by Drag&Drop Bug 41613: Skip Drang & Drop filtering for DNS-safe URLs

- - - - -

1 changed file:

- toolkit/torbutton/components/dragDropFilter.js

Changes:

===================================== toolkit/torbutton/components/dragDropFilter.js ===================================== @@ -113,6 +113,25 @@ DragDropFilter.prototype = { for (let i = 0, count = aDataTransfer.mozItemCount; i < count; ++i) { this.logger.log(3, `Inspecting the data transfer: ${i}.`); const types = aDataTransfer.mozTypesAt(i); + const urlType = "text/x-moz-url"; + // Fallback url type, to be parsed by this browser but not externally + const INTERNAL_FALLBACK = "application/x-torbrowser-opaque"; + if (types.contains(urlType)) { + const links = aDataTransfer.mozGetDataAt(urlType, i); + // Skip DNS-safe URLs (no hostname, e.g. RFC 3966 tel:) + const mayLeakDNS = links.split("\n").some(link => { + try { + return new URL(link).hostname; + } catch (e) { + return false; + } + }); + if (!mayLeakDNS) { + continue; + } + const opaqueKey = OpaqueDrag.store(links, urlType); + aDataTransfer.mozSetDataAt(INTERNAL_FALLBACK, opaqueKey, i); + } for (const type of types) { this.logger.log(3, `Type is: ${type}.`); if (URLISH_TYPES.includes(type)) { @@ -120,14 +139,6 @@ DragDropFilter.prototype = { 3, `Removing transfer data ${aDataTransfer.mozGetDataAt(type, i)}` ); - const urlType = "text/x-moz-url"; - // Fallback url type, to be parsed by this browser but not externally - const INTERNAL_FALLBACK = "application/x-torbrowser-opaque"; - if (types.contains(urlType)) { - const link = aDataTransfer.mozGetDataAt(urlType, i); - const opaqueKey = OpaqueDrag.store(link, urlType); - aDataTransfer.mozSetDataAt(INTERNAL_FALLBACK, opaqueKey, i); - } for (const type of types) { if ( type !== INTERNAL_FALLBACK &&

View it on GitLab: https://gitlab.torproject.org/tpo/applications/tor-browser/-/commit/07121bec...