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[SA34857] Yamaha RT Series Routers SSH CBC Mode Plaintext Recovery

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed Apr 22 2009 - 17:47:04 CDT

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TITLE:
Yamaha RT Series Routers SSH CBC Mode Plaintext Recovery

SECUNIA ADVISORY ID:
SA34857

VERIFY ADVISORY:
http://secunia.com/advisories/34857/

DESCRIPTION:
Yamaha has acknowledged a vulnerability in RT Series Routers, which
potentially can be exploited by malicious people to disclose
sensitive information.

The vulnerability is caused due to an error when handling errors
within an SSH session encrypted with a block cipher algorithm in the
CBC (Cipher-Block Chaining) mode and can be exploited to potentially
disclose plaintext data.

This is related to:
SA32740

SOLUTION:
Update to fixed versions or apply vendor workarounds (please see
vendor advisory for details).

ORIGINAL ADVISORY:
Yamaha:
http://www.rtpro.yamaha.co.jp/RT/FAQ/Security/CPNI957037.html

OTHER REFERENCES:
SA32740:
http://secunia.com/advisories/32740/

US-CERT VU#958563:
http://www.kb.cert.org/vuls/id/958563

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