Researchers from ESIEA, a French engineering school, have found and exploited some serious vulnerabilities in the TOR network. They performed an inventory of the network, finding 6,000 machines, many of whose IPs are accessible publicly and directly with the system’s source code. The specific attack involves creating a virus and using it to infect such vulnerable systems in a laboratory environment. The remaining flow can then be decrypted via a fully method of attack based on statistical analysis. Details are to be presented at Hackers to Hackers in S..o Paulo on October 29/30-2011.
Source: https://thehackernews.com/2011/10/tor-anonymizing-network-compromised-by.html