copyparty FTP: upload outside defined volumes (limited path traversal)

[ Description ]Official description

copyparty is a portable file server. Prior to 1.20.19, FTP upload path handling does not confine destinations to configured copyparty volumes. When FTP or FTPS is explicitly enabled, a low-privileged authenticated user can submit traversal paths during upload to create a new file outside configured volumes wherever the copyparty process has write permission. The attacker cannot read or overwrite files, the output name receives a randomized suffix, and copyparty does not execute the file; however, unrelated software on the same host could process the newly created file. This issue is fixed in version 1.20.19.

[ Fixes ]Fixes and patches

• copyparty 1.20.19Fixed version · GitHub Advisories · pip package copyparty: upgrade to 1.20.19 or later (affected < 1.20.19)

[ Packages ]Affected open-source packages

• copyparty pipAffected < 1.20.19 · fixed in 1.20.19 · GHSA-phv8-wgjp-g4p9

[ References ]References

• github.com/9001/copyparty/commit/b331bb1c8c8cc306b91e4d94221969335a7a3e86
• github.com/9001/copyparty/releases/tag/v1.20.19
• github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9