[CVE-2015-8607] XS File::Spec::canonpath loses taint #15084
Comments
From @xdgIt looks like the XS canonpath shipped with Perl 5.20 (corresponding to I.e. A patch to the PathTools tests to demonstrate this is here: This is a regression from PathTools-3.40. I have spot checked back to 3.12 As most File::Spec functions wash data through canonpath, this means that I believe this warrants a CVE report and will need backported fixes for David -- |
From @iabynOn Wed, Dec 09, 2015 at 12:06:10PM -0800, David Golden wrote:
I think its worth backporting to 5.20 and 5.22, but I don't think it needs Or to put it another way, I see taint as a bit like using clang's address -- |
|
The RT System itself - Status changed from 'new' to 'open' |
From @xdgOn Thu, Dec 10, 2015 at 7:26 AM, Dave Mitchell via RT <
Taint is the headline security mechanism in Perl. (See perlsec.) Breaking Even if the risk is small, it needs to be communicated to downstream David -- |
From @rjbs* David Golden <xdg@xdg.me> [2015-12-10T08:31:18]
I think a CVE is appropriate here, much as I loathe dealing with this process. Do we have a proposed fix? My guess is that it won't be a huge deal to fix it, -- |
From @tonycozOn Mon Dec 14 14:57:07 2015, perl.security@rjbs.manxome.org wrote:
Yes, it's simple, attached. Tony |
From @tonycoz0001-perl-126862-ensure-File-Spec-canonpath-preserves-tai.patchFrom b6307f728a4f842a54ea96959e386c7daa92ece1 Mon Sep 17 00:00:00 2001
From: Tony Cook <tony@develop-help.com>
Date: Tue, 15 Dec 2015 10:56:54 +1100
Subject: [perl #126862] ensure File::Spec::canonpath() preserves taint
Previously the unix specific XS implementation of canonpath() would
return an untainted path when supplied a tainted path.
For the empty string case, newSVpvs() already sets taint as needed on
its result.
---
dist/PathTools/Cwd.xs | 1 +
dist/PathTools/t/taint.t | 19 ++++++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/dist/PathTools/Cwd.xs b/dist/PathTools/Cwd.xs
index 9d4dcf0..3d018dc 100644
--- a/dist/PathTools/Cwd.xs
+++ b/dist/PathTools/Cwd.xs
@@ -535,6 +535,7 @@ THX_unix_canonpath(pTHX_ SV *path)
*o = 0;
SvPOK_on(retval);
SvCUR_set(retval, o - SvPVX(retval));
+ SvTAINT(retval);
return retval;
}
diff --git a/dist/PathTools/t/taint.t b/dist/PathTools/t/taint.t
index 309b3e5..48f8c5b 100644
--- a/dist/PathTools/t/taint.t
+++ b/dist/PathTools/t/taint.t
@@ -12,7 +12,7 @@ use Test::More;
BEGIN {
plan(
${^TAINT}
- ? (tests => 17)
+ ? (tests => 21)
: (skip_all => "A perl without taint support")
);
}
@@ -34,3 +34,20 @@ foreach my $func (@Functions) {
# Previous versions of Cwd tainted $^O
is !tainted($^O), 1, "\$^O should not be tainted";
+
+{
+ # [perl #126862] canonpath() loses taint
+ my $tainted = substr($ENV{PATH}, 0, 0);
+ # yes, getcwd()'s result should be tainted, and is tested above
+ # but be sure
+ ok tainted(File::Spec->canonpath($tainted . Cwd::getcwd)),
+ "canonpath() keeps taint on non-empty string";
+ ok tainted(File::Spec->canonpath($tainted)),
+ "canonpath() keeps taint on empty string";
+
+ (Cwd::getcwd() =~ /^(.*)/);
+ my $untainted = $1;
+ ok !tainted($untainted), "make sure our untainted value is untainted";
+ ok !tainted(File::Spec->canonpath($untainted)),
+ "canonpath() doesn't add taint to untainted string";
+}
--
2.1.4
|
From @tonycoz0002-bump-the-PathTools-version.patchFrom ca65c886d2b1c0c8557b9ba72cc443a510d25ec5 Mon Sep 17 00:00:00 2001
From: Tony Cook <tony@develop-help.com>
Date: Tue, 15 Dec 2015 11:08:32 +1100
Subject: bump the PathTools version
which is duplicated in many files
---
dist/PathTools/Cwd.pm | 2 +-
dist/PathTools/lib/File/Spec.pm | 2 +-
dist/PathTools/lib/File/Spec/AmigaOS.pm | 2 +-
dist/PathTools/lib/File/Spec/Cygwin.pm | 2 +-
dist/PathTools/lib/File/Spec/Epoc.pm | 2 +-
dist/PathTools/lib/File/Spec/Functions.pm | 2 +-
dist/PathTools/lib/File/Spec/Mac.pm | 2 +-
dist/PathTools/lib/File/Spec/OS2.pm | 2 +-
dist/PathTools/lib/File/Spec/Unix.pm | 2 +-
dist/PathTools/lib/File/Spec/VMS.pm | 2 +-
dist/PathTools/lib/File/Spec/Win32.pm | 2 +-
11 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/dist/PathTools/Cwd.pm b/dist/PathTools/Cwd.pm
index 64618f9..0d35806 100644
--- a/dist/PathTools/Cwd.pm
+++ b/dist/PathTools/Cwd.pm
@@ -3,7 +3,7 @@ use strict;
use Exporter;
use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION);
-$VERSION = '3.60';
+$VERSION = '3.61';
my $xs_version = $VERSION;
$VERSION =~ tr/_//d;
diff --git a/dist/PathTools/lib/File/Spec.pm b/dist/PathTools/lib/File/Spec.pm
index f416908..bcbec2d 100644
--- a/dist/PathTools/lib/File/Spec.pm
+++ b/dist/PathTools/lib/File/Spec.pm
@@ -3,7 +3,7 @@ package File::Spec;
use strict;
use vars qw(@ISA $VERSION);
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
my %module = (MacOS => 'Mac',
diff --git a/dist/PathTools/lib/File/Spec/AmigaOS.pm b/dist/PathTools/lib/File/Spec/AmigaOS.pm
index f979f2f..7d02ad5 100644
--- a/dist/PathTools/lib/File/Spec/AmigaOS.pm
+++ b/dist/PathTools/lib/File/Spec/AmigaOS.pm
@@ -4,7 +4,7 @@ use strict;
use vars qw(@ISA $VERSION);
require File::Spec::Unix;
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
@ISA = qw(File::Spec::Unix);
diff --git a/dist/PathTools/lib/File/Spec/Cygwin.pm b/dist/PathTools/lib/File/Spec/Cygwin.pm
index 558a742..9dd176b 100644
--- a/dist/PathTools/lib/File/Spec/Cygwin.pm
+++ b/dist/PathTools/lib/File/Spec/Cygwin.pm
@@ -4,7 +4,7 @@ use strict;
use vars qw(@ISA $VERSION);
require File::Spec::Unix;
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
@ISA = qw(File::Spec::Unix);
diff --git a/dist/PathTools/lib/File/Spec/Epoc.pm b/dist/PathTools/lib/File/Spec/Epoc.pm
index afca637..0c640ed 100644
--- a/dist/PathTools/lib/File/Spec/Epoc.pm
+++ b/dist/PathTools/lib/File/Spec/Epoc.pm
@@ -3,7 +3,7 @@ package File::Spec::Epoc;
use strict;
use vars qw($VERSION @ISA);
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
require File::Spec::Unix;
diff --git a/dist/PathTools/lib/File/Spec/Functions.pm b/dist/PathTools/lib/File/Spec/Functions.pm
index 276ddcf..9badcf2 100644
--- a/dist/PathTools/lib/File/Spec/Functions.pm
+++ b/dist/PathTools/lib/File/Spec/Functions.pm
@@ -5,7 +5,7 @@ use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $VERSION);
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
require Exporter;
diff --git a/dist/PathTools/lib/File/Spec/Mac.pm b/dist/PathTools/lib/File/Spec/Mac.pm
index 4da700c..06e73c8 100644
--- a/dist/PathTools/lib/File/Spec/Mac.pm
+++ b/dist/PathTools/lib/File/Spec/Mac.pm
@@ -4,7 +4,7 @@ use strict;
use vars qw(@ISA $VERSION);
require File::Spec::Unix;
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
@ISA = qw(File::Spec::Unix);
diff --git a/dist/PathTools/lib/File/Spec/OS2.pm b/dist/PathTools/lib/File/Spec/OS2.pm
index fad1198..d6d2f48 100644
--- a/dist/PathTools/lib/File/Spec/OS2.pm
+++ b/dist/PathTools/lib/File/Spec/OS2.pm
@@ -4,7 +4,7 @@ use strict;
use vars qw(@ISA $VERSION);
require File::Spec::Unix;
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
@ISA = qw(File::Spec::Unix);
diff --git a/dist/PathTools/lib/File/Spec/Unix.pm b/dist/PathTools/lib/File/Spec/Unix.pm
index 94e4351..5f92112 100644
--- a/dist/PathTools/lib/File/Spec/Unix.pm
+++ b/dist/PathTools/lib/File/Spec/Unix.pm
@@ -3,7 +3,7 @@ package File::Spec::Unix;
use strict;
use vars qw($VERSION);
-$VERSION = '3.60';
+$VERSION = '3.61';
my $xs_version = $VERSION;
$VERSION =~ tr/_//d;
diff --git a/dist/PathTools/lib/File/Spec/VMS.pm b/dist/PathTools/lib/File/Spec/VMS.pm
index b050bf2..ecb239d 100644
--- a/dist/PathTools/lib/File/Spec/VMS.pm
+++ b/dist/PathTools/lib/File/Spec/VMS.pm
@@ -4,7 +4,7 @@ use strict;
use vars qw(@ISA $VERSION);
require File::Spec::Unix;
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
@ISA = qw(File::Spec::Unix);
diff --git a/dist/PathTools/lib/File/Spec/Win32.pm b/dist/PathTools/lib/File/Spec/Win32.pm
index 8839800..447cbf5 100644
--- a/dist/PathTools/lib/File/Spec/Win32.pm
+++ b/dist/PathTools/lib/File/Spec/Win32.pm
@@ -5,7 +5,7 @@ use strict;
use vars qw(@ISA $VERSION);
require File::Spec::Unix;
-$VERSION = '3.60';
+$VERSION = '3.61';
$VERSION =~ tr/_//d;
@ISA = qw(File::Spec::Unix);
--
2.1.4
|
From @rjbs* Tony Cook via RT <perl5-security-report@perl.org> [2015-12-14T19:09:48]
Thanks, I'll begin the CVE and vendor notification process tomorrow, with a -- |
From @rjbs* Tony Cook via RT <perl5-security-report@perl.org> [2015-12-14T19:09:48]
I have assigned this CVE-2015-8607. I will email vendors tomorrow at lunchtime, unless there are objections between Beginning in PathTools 3.47 and/or perl 5.20.0, the File::Spec::canonpath() This defect was found and reported by David Golden of MongoDB, and the -- |
From @rjbsThis ticket has been moved to the public queue, the embargo has expired, and patches have been pushed to the main repository. I have made a new release of PathTools, available any minute now. As PathTools can be updated outside of perl, I am marking this ticket resolved, rather than pending release. -- |
From [Unknown Contact. See original ticket]This ticket has been moved to the public queue, the embargo has expired, and patches have been pushed to the main repository. I have made a new release of PathTools, available any minute now. As PathTools can be updated outside of perl, I am marking this ticket resolved, rather than pending release. -- |
|
@rjbs - Status changed from 'open' to 'resolved' |
Migrated from rt.perl.org#126862 (status was 'resolved')
Searchable as RT126862$
The text was updated successfully, but these errors were encountered: