Linux Security
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    Linux Security

    Debian: DSA-2993-1: tor security update

    Date 31 Jul 2014
    146
    Posted By LinuxSecurity Advisories
    Several issues have been discovered in Tor, a connection-based low-latency anonymous communication system, resulting in information leaks.
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-2993-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                           Peter Palfrader
    July 31, 2014                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    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
    leaks.
    
    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:
    
         https://blog.torproject.org/blog/tor-security-advisory-relay-early-traffic-confirmation-attack
    
    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
    implemented:
    
    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
       levels.
    
    o  Prepare clients to use fewer entry guards by honoring the consensus
       parameters.  The following article provides some background:
    
         https://blog.torproject.org/blog/improving-tors-anonymity-changing-guard-parameters
    
    For the stable distribution (wheezy), these problems have been fixed in
    version 0.2.4.23-1~deb7u1.
    
    For the testing distribution (jessie) and the unstable distribution
    (sid), these problems have been fixed in version 0.2.4.23-1.
    
    For the experimental distribution, these problems have been fixed in
    version 0.2.5.6-alpha-1.
    
    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: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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