bugtraq - GLSA: openssl (200303-20)

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Date: Mon, 24 Mar 2003 12:51:18 +0100
From: Daniel Ahlberg <aliz@...too.org>
To: bugtraq@...urityfocus.com
Subject: GLSA:  openssl (200303-20)

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GENTOO LINUX SECURITY ANNOUNCEMENT 200303-20
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          PACKAGE : openssl
          SUMMARY : Klima-Pokorny-Rosa attack
             DATE : 2003-03-24 11:51 UTC
          EXPLOIT : remote
VERSIONS AFFECTED : <0.9.6i-r2
    FIXED VERSION : >=0.9.6i-r2
              CVE : CAN-2003-0131

- - ---------------------------------------------------------------------

- From advisory:

"Czech cryptologists Vlastimil Klima, Ondrej Pokorny, and Tomas Rosa
have come up with an extension of the "Bleichenbacher attack" on RSA
with PKCS #1 v1.5 padding as used in SSL 3.0 and TLS 1.0.  Their
attack requires the attacker to open millions of SSL/TLS connections
to the server under attack; the server's behaviour when faced with
specially made-up RSA ciphertexts can reveal information that in
effect allows the attacker to perform a single RSA private key
operation on a ciphertext of its choice using the server's RSA key.
Note that the server's RSA key is not compromised in this attack."

Read the full advisory at:
http://www.openssl.org/news/secadv_20030319.txt

SOLUTION

It is recommended that all Gentoo Linux users who are running
dev-libs/openssl upgrade to openssl-0.9.6i-r2 as follows:

emerge sync
emerge openssl
emerge clean

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aliz@...too.org - GnuPG key is available at http://cvs.gentoo.org/~aliz
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