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Filesystem API: Ensure filenames are valid before attempting to unzip them to ensure malformed file paths don't cause issues.

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Merges [41457] to the 4.4 branch.

Built from https://develop.svn.wordpress.org/branches/4.4@41462


git-svn-id: http://core.svn.wordpress.org/branches/4.4@41295 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
John Blackbourn 2017-09-19 14:42:01 +00:00
parent 78462a6178
commit 5e87d63b30
1 changed files with 8 additions and 0 deletions
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8
wp-admin/includes/file.php
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@ -623,6 +623,10 @@ function _unzip_file_ziparchive($file, $to, $needed_dirs = array() ) {
if ( '__MACOSX/' === substr($info['name'], 0, 9) ) // Skip the OS X-created __MACOSX directory
continue;
if ( 0 !== validate_file( $info['name'] ) ) {
return new WP_Error( 'invalid_file_ziparchive', __( 'Could not extract file from archive.' ), $info['name'] );
}
$uncompressed_size += $info['size'];
if ( '/' == substr($info['name'], -1) ) // directory
@ -780,6 +784,10 @@ function _unzip_file_pclzip($file, $to, $needed_dirs = array()) {
if ( '__MACOSX/' === substr($file['filename'], 0, 9) ) // Don't extract the OS X-created __MACOSX directory files
continue;
if ( 0 !== validate_file( $file['filename'] ) ) {
return new WP_Error( 'invalid_file_pclzip', __( 'Could not extract file from archive.' ), $file['filename'] );
}
if ( ! $wp_filesystem->put_contents( $to . $file['filename'], $file['content'], FS_CHMOD_FILE) )
return new WP_Error( 'copy_failed_pclzip', __( 'Could not copy file.' ), $file['filename'] );
}