https://www.nytimes.com/2014/08/01/world/senate-intelligence-commitee-cia-interrogation-report.html
One official with knowledge of the report’s conclusions said the investigation also discovered that the officers created a false online identity to gain access on more than one occasion to computers used by the committee staff.
Creating a false identity means they had user creation access to the system, meaning they either hacked an IT manager account, or had someone working with them to create the account.
Is that where the Awan brothers come into play? I don’t know the intricacies of the senate or house IT system, but is it possible that they had management level access to the systems for both? If that is the case, they could have created the user for the CIA officers to gain access.
Just throwing a theory out there.