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Tor: Information disclosure


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200508-16 / tor
Release Date August 25, 2005
Latest Revision August 25, 2005: 01
Impact low
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-misc/tor < >= All supported architectures

Related bugreports: #102245


A flaw in Tor leads to the disclosure of information and the loss of anonymity, integrity and confidentiality.

2.  Impact Information


Tor is an implementation of second generation Onion Routing, a connection-oriented anonymizing communication service.


The Diffie-Hellman implementation of Tor fails to verify the cryptographic strength of keys which are used during handshakes.


By setting up a malicious Tor server and enticing users to use this server as first hop, a remote attacker could read and modify all traffic of the user.

3.  Resolution Information


There is no known workaround at this time.


All Tor users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/tor-"

4.  References


Page updated August 25, 2005

Summary: This is a Gentoo Linux Security Advisory

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