Wallbleed: A Memory Disclosure Vulnerability in the Great Firewall of China

A friend sent me this paper regarding a security vulnerability in Chinas Great Firewall. The hack is quite interesting and worth reading about, but this quote is what stuck with me 

Wallbleed exemplifies that the harm censorship middleboxes impose on Internet users is even beyond their obvious infringement of freedom of expression. When implemented poorly, it also imposes severe privacy and confidentiality risks to Internet users.