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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/T...




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