`?media=/officerdev/data/tatudoemcampo@gmail.com/FofosWebsite/media/originals/ABOUT+US`
became `?media=ABOUT+US`.
the length is the smaller half. the absolute form put THE ACCOUNT'S EMAIL ADDRESS in
every link — so a URL sent to a colleague, or pasted into a chat, carried the owner's
address and the shape of their disk with it. relative, it says nothing about the
machine or who owns it.
it also makes the jail hold BY CONSTRUCTION rather than by comparison. the value is
joined to `basePath`, so there is no "outside" left to check for — only `..` could
climb out, and a `..` segment is refused outright. the previous version compared a
caller-supplied absolute path against a prefix, which is the weaker shape and the one
that goes wrong when somebody later "simplifies" it.
round-trip and tampering both exercised against the real base path before committing:
base, a folder with a space, a nested folder with a non-ascii name, then `../../etc`,
`GALLERY/../../..` and `/etc/passwd` — refused, refused, contained.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Officer-Session: 656f5c85-e49a-4f1f-b9f3-042a04b4d043
pastilhasandClaude Opus 5
321cac2e80