Bash 2.05b patch for 896776 - (CVE-2014-6271) ?

[Jean-Christian de Rivaz]

Hello,

While this can seem completely obsolete, I still have machines running 
bash 2.05b (Debian etch). I worry about upgrading to bash 3.x because of 
some backward compatibility issue.
It there any reason why there was no patch for bash 2.05b ? The test 
command below show that the bug also affect this version:

j$ bash --version
GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu)
Copyright (C) 2002 Free Software Foundation, Inc.
j$ env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
vulnerable
this is a test

Best Regards,

Jean-Christian