My situation is somewhat similar to this question, but I'm the plagiarizer.
Six years ago I did my Master's degree by coursework at university X, and wrote the Master's thesis under supervision of well-known Prof. A. For many reasons that I don't want to list here, I plagiarized. The first part of my thesis was background, and the second part was the original contribution.
In the background part, I copied an entire chapter from textbook T about algorithm S. Algorithm S was invented more than 50 years ago, and is described in several books, including the very well-known T. I didn't paraphrase at all, I started by citing T, and then copied the whole chapter word by word.
The contribution part is actually contribution. One year after I left the school, Prof. A found another student to extend it and published the extension with me as the second author. (The paper included the algorithm and experiment in my thesis, but I didn't write a single word of the paper.)
I have moved to university Y to do a PhD. I have published several papers in top conferences and have very good relationship with several well-known researchers. I want to advance in academia.
Will the Master's thesis destroy any possibility of a future academic career? If someone read my Master's thesis, it is very easy to recognize, since the part from the textbook is in perfect English, and the rest is in extremely poor English.
Can I contact the university to submit a revised Master's thesis which re-describes the algorithm S? This is the last thing I want to do.