LightLLM through 1.2.0 contains an authentication bypass vulnerability in the /pd_register WebSocket endpoint that allows unauthenticated attackers to register arbitrary nodes by supplying crafted JSON without peer address validation. Attackers can disclose full user prompts routed to their socket, trigger denial of service by replacing legitimate nodes, or make the PD Master issue requests to internal network addresses.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 7
https://github.com/ModelTC/LightLLM
disclosure@vulncheck.com
https://github.com/ModelTC/LightLLM/issues/1576
disclosure@vulncheck.com
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py#L19…
disclosure@vulncheck.com
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_pd.py#…
disclosure@vulncheck.com
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_…
disclosure@vulncheck.com
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_…
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authenticat…
disclosure@vulncheck.com