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TITLE:
Ruby "Net::HTTPS" Common Name Verification Security Issue

SECUNIA ADVISORY ID:
SA26985

VERIFY ADVISORY:
http://secunia.com/advisories/26985/

CRITICAL:
Less critical

IMPACT:
Spoofing

WHERE:
>From remote

SOFTWARE:
Ruby 1.8.x
http://secunia.com/product/3787/

DESCRIPTION:
Chris Clark has reported a security issue in Ruby, which can be
exploited by malicious people to conduct spoofing attacks.

The security issue is caused due to the "Net::HTTPS" library not
properly checking if the Common Name field provided inside SSL server
certificates matches the requested hostname of a server. This can be
exploited to conduct spoofing attacks.

Successful exploitation requires a MitM (Man-in-the-Middle) attack
and possession of a valid certificate, which is signed by the CA
specified in the client.

The security issue is reported in version 1.8.5 and 1.8.6.

SOLUTION:
Fixed in SVN repository.

PROVIDED AND/OR DISCOVERED BY:
Chris Clark, iSEC Partners

ORIGINAL ADVISORY:
http://www.isecpartners.com/advisories/2007-006-rubyssl.txt

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