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Debian: 2993-1: tor: Summary Print E-mail
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Posted by Benjamin D. Thomas   
Debian Security Report Summary
- -------------------------------------------------------------------------
Debian Security Advisory DSA-2993-1                                    Peter Palfrader
July 31, 2014                
- -------------------------------------------------------------------------

Package        : tor
CVE ID         : CVE-2014-5117

Several issues have been discovered in Tor, a connection-based
low-latency anonymous communication system, resulting in information

o  Relay-early cells could be used by colluding relays on the network to
   tag user circuits and so deploy traffic confirmation attacks
   [CVE-2014-5117].  The updated version emits a warning and drops the
   circuit upon receiving inbound relay-early cells, preventing this
   specific kind of attack.  Please consult the following advisory for
   more details about this issue:

o  A bug in the bounds-checking in the 32-bit curve25519-donna
   implementation could cause incorrect results on 32-bit
   implementations when certain malformed inputs were used along with a
   small class of private ntor keys.  This flaw does not currently
   appear to allow an attacker to learn private keys or impersonate a
   Tor server, but it could provide a means to distinguish 32-bit Tor
   implementations from 64-bit Tor implementations.

The following additional security-related improvements have been

o  As a client, the new version will effectively stop using CREATE_FAST
   cells.  While this adds computational load on the network, this
   approach can improve security on connections where Tor's circuit
   handshake is stronger than the available TLS connection security

o  Prepare clients to use fewer entry guards by honoring the consensus
   parameters.  The following article provides some background:

For the stable distribution (wheezy), these problems have been fixed in

For the testing distribution (jessie) and the unstable distribution
(sid), these problems have been fixed in version

For the experimental distribution, these problems have been fixed in

We recommend that you upgrade your tor packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:

Mailing list:
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