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Fix CVE-2018-12015:
https://security-tracker.debian.org/tracker/CVE-2018-12015
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12015
https://rt.cpan.org/Ticket/Display.html?id=125523
Patch taken from this upstream commit and adapted to apply to
the bundled copy in the Perl distribution:
https://github.com/jib/archive-tar-new/commit/ae65651eab053fc6dc4590dbb863a268215c1fc5
diff --git a/cpan/Archive-Tar/lib/Archive/Tar.pm b/cpan/Archive-Tar/lib/Archive/Tar.pm
index 6244369..a83975f 100644
--- a/cpan/Archive-Tar/lib/Archive/Tar.pm
+++ b/cpan/Archive-Tar/lib/Archive/Tar.pm
@@ -845,6 +845,20 @@ 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 (
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