I disagree with the notion that the CIA was simply trying to undermine the NSA. While I can accept that Snowdens actions were in part to discredit the NSA, I believe that the primary purpose of the Snowden release was to act as a public distraction to provide a plausible deniability defense for the CIA after they fumbled the technology into foreign hands by their abuse of the technology to rig stock markets.

If the goal of the CIA was to simply expose the NSA, then they could have simply pointed to the fact that the EU filed a lawsuit alleging the abuse of PRISIM, and other programs. There would be no need for a Snowden. Why didn't they blame the NSA for the EU lawsuit? ...

Instead, the EU lawsuit that specifically named PRISM and exposed the secret tech (prior to Snowden) was completely scrubbed from the net, and the lawsuit has never been heard of since. That's a coverup.
Later, Snowden appeared, and has been universally fingered as the source of the leak of those programs, even though I know (from MSM report) that specific details, and illegal uses of those programs were already known by members of the EU. Snowden was a patsy for the CIA to use to deflect, and provide plausible deniability for how those programs really became known to the the public. They became known to the public because the US govt. got caught using the programs to steal. Snowden is a patsy for a far more severe crime than simply leaking classified data.