https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=42404

--- Comment #23 from Martin Renvoize (ashimema) 
<[email protected]> ---
Created attachment 200842
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=200842&action=edit
Bug 42404: (follow-up) Canonicalize extraction directory before path-traversal
check

The path-traversal guard compares Cwd::abs_path(\$full_path) against
\$dirname using a regex anchor.  If \$dirname itself contains unresolved
symlink components the comparison could be fooled.

Resolve \$dirname via Cwd::abs_path() immediately after extraction (once
the directory exists on disk) so both sides of the comparison are fully
canonicalized.

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