Description

PraisonAI Has SSRF in FileTools.download_file() via Unvalidated URL

Summary

FileTools.download_file() in praisonaiagents validates the destination path but performs no validation on the url parameter, passing it directly to httpx.stream() with follow_redirects=True. An attacker who controls the URL can reach any host accessible from the server including cloud metadata services and internal network services.

Details

file_tools.py:259 (source) -> file_tools.py:296 (sink)

# source -- url taken directly from caller, no validation
def download_file(self, url: str, destination: str, ...):

# sink -- unvalidated url passed to httpx with redirect following
    with httpx.stream("GET", url, timeout=timeout, follow_redirects=True) as response:

PoC

# start listener: python3 -m http.server 8888

import os
os.environ['PRAISONAI_AUTO_APPROVE'] = 'true'
from praisonaiagents.tools.file_tools import download_file

result = download_file(
    url="http://127.0.0.1:8888/ssrf-test",...
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Impact

On cloud infrastructure with IMDSv1 enabled, an attacker can retrieve IAM credentials via the EC2 metadata service and write them to disk for subsequent agent steps to exfiltrate. follow_redirects=True enables open-redirect chaining to bypass partial URL filters. Reachable via indirect prompt injection with no authentication required.

Suggested Fix

from urllib.parse import urlparse
import ipaddress

BLOCKED_NETWORKS = [
    ipaddress.ip_network("127.0.0.0/8"),
    ipaddress.ip_network("169.254.0.0/16"),
    ipaddress.ip_network("10.0.0.0/8"),
    ipaddress.ip_network("172.16.0.0/12"),...
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Mitigation

Aliases

References