[Full-disclosure] ScatterChat Advisory 2006-02: Win32 Tor Client Routing and Denial of Service Vulnerabilities

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ScatterChat Advisory 2006-02: Win32 Tor Client Routing and Denial of
Service Vulnerabilities
Technical Report
September 2nd, 2006

CVE ID: CVE-2006-4508
OSVDB: 28276, 28277

SUMMARY

ScatterChat (http://www.scatterchat.com/) is an instant messaging project
that aims to provide encryption and anonymity support with Tor to
non-technical users such as human rights activists and political
dissidents.

Vulnerabilities were found in the external Tor program that is packaged
with the Windows installer. This vulnerability allows a Tor entry node
to route traffic through the client, or to cause a denial of service by
crashing the Tor process with malformed input.

The impact of this vulnerability is low.

DETAILS

The official Tor advisory can be found at:
http://archives.seul.org/or/announce/Aug-2006/msg00001.html

IMPACT

The end-user impact of this issue is low.

Should a malicious or compromised Tor entry node successfully exploit
these issues, the local user's Tor process would crash, and/or the user's
machine would route traffic to other Tor nodes.

Routing unwanted traffic would cause bandwidth resources to be consumed
as long as ScatterChat is running.

SOLUTION

All Windows users who employ ScatterChat's anonymity feature are
strongly encouraged to upgrade to ScatterChat v1.0.2:

http://www.scatterchat.com/download/v1.0.2/scatterchat-1.0.2.exe
http://www.scatterchat.com/download/v1.0.2/scatterchat-1.0.2.exe.sig

CONTACT

J. Salvatore Testa II
jtesta–at–hacktivismo–dot–com

http://www.scatterchat.com/jtesta_2006.asc
3428 E58E 715E C37D 2AA7 C55E 97D1 DE8C 4B26 2B62

A less technical summary of this advisory can be found at:
http://www.scatterchat.com/advisories/2006-02_non_tech.html

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