We have found a flaw in the generation of the
Application.config.secret_token value. This value is used in the file
/usr/share/katello/config/initializers/secret_token.rb to provide a secret
token when session cookies are generated for user sessions within Katello.

Specifically a static key with a value of:

f466b184ef680822293d7130f57593a7087a34b5de0607c64d1ceb66fcac4dce\
6810a6f176feba3fbbf2489de93c0918397c0c275996eb476b2fa6079ab849c1

is included by default. The spec file for Katello includes commands to generate a new key:

NEWKEY=$(</dev/urandom tr -dc A-Za-z0-9 | head -c128)
sed -i "s/^Src::Application.config.secret_token = '.*'/Src::Application.config.secret_token = '$NEWKEY'/" \
    /usr/share/katello/config/initializers/secret_token.rb

however this was erroneously placed in the "postuninstall" section, which is 
run when removing Katello from the system). Thus a new secret token is not 
created and all affected Katello installations have the same secret token 
value.

https://access.redhat.com/security/cve/CVE-2012-3503