We have just release Chef 10.34.6. This release contains bash 3.1 updated to patch level 23, which provides security updates for Shellshock related vulnerabilities CVE-2014-6271, CVE-2014-6271, CVE-2014-6278, CVE-2014-7186, CVE-2014-7187.
You can download this release for Windows using this link:
Chef Client 10.34.6
If you have any problems with this release, you can file an issue at Github.