Mandriva Linux Security Advisory 2013-132 - Tor before 0.2.2.34, when configured as a client or bridge, sends a TLS certificate chain as part of an outgoing OR connection, which allows remote relays to bypass intended anonymity properties by reading this chain and then determining the set of entry guards that the client or bridge had selected. Tor before 0.2.2.34, when configured as a bridge, accepts the CREATE and CREATE_FAST values in the Command field of a cell within an OR connection that it initiated, which allows remote relays to enumerate bridges by using these values. Various other vulnerabilities have been addressed.
5ee102c8464d210c11eb70256fe5f9fdeb5edd501b3b5eb68b0590a9bb1f0ee1