I had to patch an old CentOS 4.9 server, so I pulled the latest source RPM from the Red Hat FTP and added the upstream patch from the GNU FTP. The steps are below:
First, follow the "Setup" procedure from http://bradthemad.org/tech/notes/patching_rpms.php:
echo "%_topdir /home/$(whoami)/src/rpm" > ~/.rpmmacros
mkdir -p ~/src/rpm/{BUILD,RPMS,SOURCES,SPECS,SRPMS
mkdir -p ~/src/rpm/RPMS/{i386,i486,i586,i686,noarch,athlon}
Then run the following commands from your %_topdir:
cd ~/src/rpm
wget http://ftp.redhat.com/redhat/linux/updates/enterprise/4ES/en/os/SRPMS/bash-3.0-27.el4.src.rpm
rpm -ivh bash-3.0-27.el4.src.rpm
cd SOURCES
wget http://ftp.gnu.org/gnu/bash/bash-3.0-patches/bash30-017
cd ..
Patch SPECS/bash.spec with this diff:
4c4
< Release: 27%{?dist}
---
> Release: 27.2%{?dist}
28a29
> Patch17: bash30-017
110c111,112
< #%patch16 -p0 -b .016
---
> %patch16 -p0 -b .016
> %patch17 -p0 -b .017
Then finish with these commands:
rpmbuild -ba SPECS/bash.spec
sudo rpm -Uvh RPMS/i386/bash-3.0-27.2.i386.rpm
Edit: The latest comments in the Red Hat Bugzilla say the patch is incomplete. The new ID is CVE-2014-7169.
Edit: There are two additional patches from gnu.org, so also download those into the same SOURCES directory:
wget http://ftp.gnu.org/gnu/bash/bash-3.0-patches/bash30-018
wget http://ftp.gnu.org/gnu/bash/bash-3.0-patches/bash30-019
Then also edit the SPECS/bash.spec as follows ("Release" numbering optional):
4c4
< Release: 27%{?dist}
---
> Release: 27.2.019%{?dist}
28a29,31
> Patch17: bash30-017
> Patch18: bash30-018
> Patch19: bash30-019
110c113,116
< #%patch16 -p0 -b .016
---
> %patch16 -p0 -b .016
> %patch17 -p0 -b .017
> %patch18 -p0 -b .018
> %patch19 -p0 -b .019
