From:
https://bugs.launchpad.net/nova/+bug/868360
If the secret key doesn't match for the ec2 request, the exception passed back to the user, showing the correct password.
To replicate: # export EC2ACCESSKEY='oomNAG3AGwnlKDAM9gFe' # export EC2SECRETKEY='anything' # euca-describe-instances [...] InvalidSignature: Invalid signature w6q++6lcvoEcBkcQuT1yNDURSpM8tq3a+WbhYeKWuX4= for user User('nova', 'nova', 'oomNAG3AGwnlKDAM9gFe', 'eXTMGYDx7FhSI7ng3YfE', True).
i.e. the correct password is leaked back to the user if the incorrect password is given
CVE 2011-4076 is reserved for the issue