Description (CNA)
Caddy is an extensible server platform that uses TLS by default. From version 2.7.5 to before version 2.11.2, the vars_regexp matcher in vars.go:337 double-expands user-controlled input through the Caddy replacer. When vars_regexp matches against a placeholder like {http.request.header.X-Input}, the header value gets resolved once (expected), then passed through repl.ReplaceAll() again (the bug). This means an attacker can put {env.DATABASE_URL} or {file./etc/passwd} in a request header and the server will evaluate it, leaking environment variables, file contents, and system info. This issue has been patched in version 2.11.2.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| caddyserver / caddy | affected >= 2.7.5, < 2.11.2 |
CWE
CWE-200, CWE-74
References
- https://github.com/caddyserver/caddy/security/advisories/GHSA-m2w3-8f23-hxxf
- https://github.com/caddyserver/caddy/pull/5408
- https://github.com/caddyserver/caddy/releases/tag/v2.11.2
ADP enrichment
No English description supplied.
No references supplied.