OpenBSD Security Advisory -- Patches available for two attacks on RSA in OpenSSL

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             AUSCERT External Security Bulletin Redistribution

                ESB-2003.0194 -- OpenBSD Security Advisory
            Patches available for two attacks on RSA in OpenSSL
                               20 March 2003

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                OpenSSL
Vendor:                 OpenBSD
Operating System:       OpenBSD 3.1
                        OpenBSD 3.2
                        Linux
                        UNIX
Impact:                 Access Confidential Data
Access Required:        Remote
CVE Names:              CAN-2003-0078, CAN-2003-0147

Ref:                    ESB-2003.0111

Comment: Please note, this External Security Bulletin contains two
         OpenBSD advisories, both referencing vulnerabilities in OpenSSL.

         Also note, the URL in the second advisory which references the
         OpenSSL advisory site is incorrect and should read:
         http://www.openssl.org/news/secadv_20030219.txt

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Researchers have discovered a timing attack on RSA keys to which
OpenSSL is vulnerable.  OpenBSD patches are now available.
The following paper describes the attack in detail:
    http://crypto.stanford.edu/~dabo/papers/ssl-timing.pdf

The patches have already been committed to OpenBSD-current and the
3.1 and 3.2 -stable branches.  For those who wish to manually
patch their systems, the following patches are available.

Patch for OpenBSD 3.1:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.1/common/024_blinding.patch

Patch for OpenBSD 3.2:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.2/common/011_blinding.patch

The OpenSSL advisory (from which the patches are derived) is:
    http://www.openssl.org/news/secadv_20030317.txt

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Researchers have discovered an extension of the "Bleichenbacher
attack" on RSA with PKCS #1 v1.5 padding.  The attack affects TLS
1.0 (aka SSL 3.0) but does *not* affect OpenSSH.  Exploitation
requires that an attacker open millions of TLS connections to the
machine being attacked.

Users who run services utilizing TLS and RSA encryption should
update their OpenSSL to the version now in OpenBSD-current and the
3.1 and 3.2 -stable branches or use one of the patches below.

Patch for OpenBSD 3.1:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.1/common/025_kpr.patch

Patch for OpenBSD 3.2:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.2/common/012_kpr.patch

The OpenSSL advisory (from which the patches are derived) is:
    http://www.openssl.org/news/secadv_20030319.txt

The following paper describes the attack in detail:
    http://eprint.iacr.org/2003/052/

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