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TITLE:
Tor Cryptographic Handshake Vulnerability

SECUNIA ADVISORY ID:
SA16424

VERIFY ADVISORY:
http://secunia.com/advisories/16424/

CRITICAL:
Moderately critical

IMPACT:
Manipulation of data, Exposure of sensitive information

WHERE:
>From remote

SOFTWARE:
Tor 0.x
http://secunia.com/product/5269/

DESCRIPTION:
Roger Dingledine has reported a vulnerability in Tor, which
potentially can be exploited by malicious people to disclose or
modify certain sensitive information.

The vulnerability is caused due to the Tor client failing to reject
certain weak keys when performing a Diffie-Hellman handshake. This
can potentially be exploited by the first Tor server in the path to
disclose all keys the client negotiates for the rest of the path and
then read or modify all client traffic.

The vulnerability has been reported in versions 0.1.0.13 and prior.

SOLUTION:
Update to version 0.1.0.14.
http://tor.eff.org/download.html

PROVIDED AND/OR DISCOVERED BY:
Roger Dingledine

ORIGINAL ADVISORY:
http://archives.seul.org/or/announce/Aug-2005/msg00002.html

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About:
This Advisory was delivered by Secunia as a free service to help
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vulnerabilities.

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Please Note:
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