Crawl4AI from 0.8.7 through 0.9.5 contains a server-side request forgery vulnerability in the Docker API server that allows unauthenticated attackers to bypass destination checks via URL userinfo parsing differences. Attackers can set fetch_ssl_certificate=true with crafted userinfo URLs so SSLCertificate.from_url connects to internal hosts on port 443, probing reachability and leaking certificate details.
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
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/unclecode/crawl4ai/blob/v0.9.5/crawl4ai/async_crawler_strate…
disclosure@vulncheck.com
https://github.com/unclecode/crawl4ai/blob/v0.9.5/crawl4ai/ssl_certificate.py
disclosure@vulncheck.com
https://github.com/unclecode/crawl4ai/blob/v0.9.5/deploy/docker/utils.py
disclosure@vulncheck.com
https://github.com/unclecode/crawl4ai/pull/2304
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/crawl4ai-0.8.7-through-0.9.5-ssrf-bypass-v…
disclosure@vulncheck.com