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Nessus & the OpenSSL SSL_Get_Shared_Ciphers() vulnerability

from [Renaud Deraison] Network Security [Permanent Link]
Subject: Nessus & the OpenSSL SSL_Get_Shared_Ciphers() vulnerability
Date: Thu, 28 Sep 2006 19:46:32 -0400 


Hi,

A vulnerability has been disclosed in OpenSSL's SSL_Get_Shared_Ciphers () function[1]. This vulnerability may affect the Nessus plugin ssl_ciphers.nes which uses this function and might be used by an attacker to break into a Nessus scanner by setting up a rogue SSL server and waiting for it to be scanned.

To avoid being vulnerable, make sure to upgrade the SSL libraries your Nessus servers are running on (refer to your OS vendor for this). If you do not have the ability to upgrade your SSL libraries, or if you OS vendor is slow to produce a patch, deleting the file / opt/nessus/lib/nessus/plugins/ssl_ciphers.nes is a possible workaround.

Thanks,

                                        -- Renaud


[1] http://www.securityfocus.com/bid/20249
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