oss-security - TMP flaw in rackspace jclouds?

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Date: Wed, 18 Jun 2014 20:52:59 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com, andrew@...l.org
Subject: TMP flaw in rackspace jclouds?

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https://github.com/rackspace/jclouds/

So CC'ing Andrew, he's a consistent contributor, I can't file an issue
in Github (no link to it) so posting here and CC'ing him.

https://github.com/rackspace/jclouds/blob/master/scriptbuilder/src/main/java/org/jclouds/scriptbuilder/domain/Statements.java

  public static Statement extractTargzAndFlattenIntoDirectory(URI tgz,
String dest) {
      return new StatementList(ImmutableSet.<Statement> builder()
            .add(exec("mkdir /tmp/$$"))
            .add(extractTargzIntoDirectory(tgz, "/tmp/$$"))
            .add(exec("mkdir -p " + dest))
            .add(exec("mv /tmp/$$/*/* " + dest))
            .add(exec("rm -rf /tmp/$$")).build());
   }


This is insecure, $$ == PID == predictable

http://kurt.seifried.org/2012/03/14/creating-temporary-files-securely/

use java.io.File.createTempFile() ? some interesting info at
http://www.veracode.com/blog/2009/01/how-boring-flaws-become-interesting/

for directories there is a helpful posting at
http://stackoverflow.com/questions/617414/create-a-temporary-directory-in-java

Thanks.


- -- 
Kurt Seifried -- Red Hat -- Product Security -- Cloud
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