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GnuTLS TLS Session Renegotiation Plaintext Injection Vulnerability

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Release Date:  2009-11-06    Views:  5,425

Secunia Advisory SA37292

Where:

From remote

Impact:

Manipulation of data

Solution Status:

Unpatched

Software:

CVE Reference(s):

Description


A vulnerability has been reported in GnuTLS, which can be exploited by malicious people to manipulate certain data.

The vulnerability is caused due to an error in the TLS protocol while handling session renegotiations. This can be exploited to insert arbitrary plaintext before data sent by a legitimate client in an existing TLS session, via Man-in-the-Middle (MitM) attacks.

This is related to:
SA37291


Solution:
Do not rely on the integrity of incoming TLS data in environments allowing session renegotiation.

Provided and/or discovered by:
Independently discovered by Marsh Ray of PhoneFactor and Martin Rex.

Original Advisory:
PhoneFactor:
http://extendedsubset.com/?p=8

Martin Rex:
http://www.ietf.org/mail-archive/web/tls/current/msg03928.html

http://lists.gnu.org/archive/html/gnutls-devel/2009-11/msg00029.html

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: GnuTLS TLS Session Renegotiation Plaintext Injection Vulnerability

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