ZerethShell — File Manager

remove_entry_secure-i.yaml

--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: "This method removes a file system entry <tt>path</tt>. <tt>path</tt> shall be a regular file, a directory, or something. If <tt>path</tt> is a directory, remove it recursively. This method is required to avoid TOCTTOU (time-of-check-to-time-of-use) local security vulnerability of #rm_r. #rm_r causes security hole when:"
- !ruby/struct:SM::Flow::VERB 
  body: "  * Parent directory is world writable (including /tmp).\n  * Removing directory tree includes world writable directory.\n  * The system has symbolic link.\n"
- !ruby/struct:SM::Flow::P 
  body: To avoid this security hole, this method applies special preprocess. If <tt>path</tt> is a directory, this method chown(2) and chmod(2) all removing directories. This requires the current process is the owner of the removing whole directory tree, or is the super user (root).
- !ruby/struct:SM::Flow::P 
  body: "WARNING: You must ensure that <b>ALL</b> parent directories cannot be moved by other untrusted users. For example, parent directories should not be owned by untrusted users, and should not be world writable except when the sticky bit set."
- !ruby/struct:SM::Flow::P 
  body: "WARNING: Only the owner of the removing directory tree, or Unix super user (root) should invoke this method. Otherwise this method does not work."
- !ruby/struct:SM::Flow::P 
  body: "For details of this security vulnerability, see Perl's case:"
- !ruby/struct:SM::Flow::VERB 
  body: "  http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0448\n  http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0452\n"
- !ruby/struct:SM::Flow::P 
  body: For fileutils.rb, this vulnerability is reported in [ruby-dev:26100].
full_name: FileUtils#remove_entry_secure
is_singleton: false
name: remove_entry_secure
params: (path, force = false)
visibility: public

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