fix(extensions): re-validate catalog URL after redirects (HTTPS parity/security)#3524
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jawwad-ali wants to merge 1 commit into
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fix(extensions): re-validate catalog URL after redirects (HTTPS parity/security)#3524jawwad-ali wants to merge 1 commit into
jawwad-ali wants to merge 1 commit into
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ExtensionCatalog._fetch_single_catalog opened the catalog URL and trusted the payload without re-validating response.geturl() after redirects. _open_url follows redirects (stripping auth only on an HTTPS->HTTP downgrade), so an https:// catalog entry that 30x-redirects to http://attacker/... was still fetched and trusted. The payload supplies each extension's download_url + sha256, so a redirected payload can drive install of an arbitrary archive that passes sha256 verification. Add the post-redirect geturl() re-validation via _validate_catalog_url, mirroring integrations/catalog.py, presets, workflows/catalog.py, and bundler adapters. Sibling of the same fix in the presets catalog fetcher. Test: an HTTPS URL whose response.geturl() reports http:// is rejected (ExtensionError). Completed existing fetch-test mocks that predated this behavior to report geturl() like a real urllib response. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
ExtensionCatalog._fetch_single_catalogfetched the catalog JSON and trusted it without re-validating the post-redirect URL — the same gap as in the presets catalog fetcher:_open_urlfollows redirects (stripping auth only on an HTTPS→HTTP downgrade), so anhttps://catalogentry.urlthat 30x-redirects tohttp://attacker/catalog.jsonis still fetched and trusted. The payload supplies each extension'sdownload_urlandsha256, so an attacker-controlled redirected payload defeats sha256 verification and can drive installation of an arbitrary archive.Fix
Re-validate
response.geturl()after the redirect via_validate_catalog_url, mirroringintegrations/catalog.py,workflows/catalog.py,bundler/services/adapters.py, and the presets catalog fetcher. This is the extensions sibling of the presets fix.Test
test_fetch_single_catalog_revalidates_redirected_url: an HTTPS URL whoseresponse.geturl()reportshttp://is rejected withExtensionError(fails before: no revalidation). Existing fetch-test mocks were completed to reportgeturl()like a realurllibresponse.🤖 Written with the assistance of Claude Code (AI). Bug self-found; fix/tests verified locally (fail-before / pass-after).