Description (CNA)
Algernon is a small self-contained pure-Go web server. Prior to 1.17.8, when algernon is started with --domain (or --letsencrypt, which silently turns on --domain at engine/flags.go:372), the request handler resolves the served directory by joining the configured --dir with the value of the client-supplied Host header. The join is performed by filepath.Join with no validation, so a Host: .. header walks one level above the document root. Subsequent file resolution then exposes everything in that parent directory — arbitrary file read, full directory listing, and, if any .lua file is present, server-side Lua execution. This vulnerability is fixed in 1.17.8.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| xyproto / algernon | affected < 1.17.8 |
CWE
CWE-22, CWE-23, CWE-644
References
ADP enrichment
No English description supplied.