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Vigil@nce: TLS, OpenSSL, GnuTLS: vulnerability of the renegotiation

November 2009 by Vigil@nce

A remote attacker can use a vulnerability of TLS in order to
insert pain text data during a renegotiation via a
man-in-the-middle attack.

 Severity: 2/4
 Consequences: data creation/edition
 Provenance: internet client
 Means of attack: no proof of concept, no attack
 Ability of attacker: expert (4/4)
 Confidence: confirmed by the editor (5/5)
 Diffusion of the vulnerable configuration: high (3/3)
 Creation date: 10/11/2009

IMPACTED PRODUCTS

 Apache httpd
 Debian Linux
 HTTPS
 OpenSSL
 Red Hat Enterprise Linux
 Slackware Linux
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

Transport Layer Security (TLS) is a cryptographic protocol for
network transport.

When opening a connection using TLS, a negotiation mechanism
allows the client and server to agree on the encryption algorithm
to use.

The protocol allows for renegotiation at any time during the
connection. However, the handling of those renegotiations has a
vulnerability.

A remote attacker can therefore exploit this vulnerability in
order to insert pain text data via a man-in-the-middle attack.

CHARACTERISTICS

 Identifiers: 111046, BID-36935, cisco-sa-20091109-tls, CTX123359,
CVE-2009-3555, DSA-1934-1, RHSA-2009:1579-02, RHSA-2009:1580-02,
SSA:2009-320-01, VIGILANCE-VUL-9181, VU#120541
 Url: http://vigilance.fr/vulnerability/TLS-OpenSSL-GnuTLS-vulnerability-of-the-renegotiation-9181


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