Tor: Information disclosure

1. Gentoo Linux Security Advisory

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	< 0.1.0.14	>= 0.1.0.14	All supported architectures

Related bugreports: #102245

Synopsis

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

2. Impact Information

Background

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

Description

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

Impact

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

Workaround

There is no known workaround at this time.

Resolution

All Tor users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/tor-0.1.0.14"

4. References

Page updated August 25, 2005

Summary: This is a Gentoo Linux Security Advisory

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