From 79481caa0bb8f38e7d00f64e5e9401faa02585cc Mon Sep 17 00:00:00 2001 From: Chris Date: Mon, 22 Jun 2015 05:23:52 +0000 Subject: [PATCH] Bug 14408 Path Traversal error Counter counter patch Please test well, including with the null byte %00, this uses a whitelisting to only allow files ending with .tt and not allowing ../etc Note the previous patch tries to protect against /etc/passwd but //etc/passwd is now vulnerable. I do think a whitelist is safer than trying to do a blacklist /cgi-bin/koha/svc/virtualshelves/search /cgi-bin/koha/svc/members/search Are vulnerable To test: 1/ Hit /cgi-bin/koha/svc/members/search?template_path=members/tables/members_results.tt Notice you get a valid JSON response 2/ Hit /search?template_path=..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd (You may have add more ..%2f or remove them to get the correct path) Notice you can see the contents of the /etc/passwd file 3/ Hit /cgi-bin/koha/svc/members/search?template_path=test%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd 4/ Apply patch 5/ Hit the first url again, notice it still works 6/ Hit the second url notice it now errors with a file not found 7/ Hit the third url notice it now errors with a file not found Repeat for the other script also Signed-off-by: Jonathan Druart --- C4/Auth.pm | 3 +++ 1 file changed, 3 insertions(+) diff --git a/C4/Auth.pm b/C4/Auth.pm index c4719e6..c140318 100644 --- a/C4/Auth.pm +++ b/C4/Auth.pm @@ -157,6 +157,9 @@ sub get_template_and_user { my ( $user, $cookie, $sessionID, $flags ); C4::Context->interface( $in->{type} ); + + my $safe_chars = 'a-zA-Z_\-\/'; + die "bad template path" unless $in->{'template_name'} =~ m/^[$safe_chars]+.tt?$/ig; #sanitize input $in->{'authnotrequired'} ||= 0; my $template = C4::Templates::gettemplate( -- 2.1.0