File perl-archive-tar-dirtrav.diff of Package perl.8451

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File perl-archive-tar-dirtrav.diff of Package perl.8451

--- ./cpan/Archive-Tar/lib/Archive/Tar.pm.orig	2018-06-27 14:13:08.131148055 +0000
+++ ./cpan/Archive-Tar/lib/Archive/Tar.pm	2018-06-27 14:14:50.562873606 +0000
@@ -842,9 +842,23 @@ sub _extract_file {
         return;
     }
 
+    ### If a file system already contains a block device with the same name as
+    ### the being extracted regular file, we would write the file's content
+    ### to the block device. So remove the existing file (block device) now.
+    ### If an archive contains multiple same-named entries, the last one
+    ### should replace the previous ones. So remove the old file now.
+    ### If the old entry is a symlink to a file outside of the CWD, the new
+    ### entry would create a file there. This is CVE-2018-12015
+    ### <https://rt.cpan.org/Ticket/Display.html?id=125523>.
+    if (-l $full || -e _) {
+        if (!unlink $full) {
+            $self->_error( qq[Could not remove old file '$full': $!] );
+            return;
+        }
+    }
     if( length $entry->type && $entry->is_file ) {
         my $fh = IO::File->new;
-        $fh->open( '>' . $full ) or (
+        $fh->open( $full, '>' ) or (
             $self->_error( qq[Could not open file '$full': $!] ),
             return
         );

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