AUSCERT External Security Bulletin Redistribution

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


        AusCERT Security Bulletin Summary

Product:                OpenSSL
Vendor:                 OpenBSD
Operating System:       OpenBSD 3.1
                        OpenBSD 3.2
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:

- --------------------------BEGIN INCLUDED TEXT--------------------

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:

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:

Patch for OpenBSD 3.2:

The OpenSSL advisory (from which the patches are derived) is:

- -----

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:

Patch for OpenBSD 3.2:

The OpenSSL advisory (from which the patches are derived) is:

The following paper describes the attack in detail:

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business 
                hours which are GMT+10:00 (AEST).  On call after hours 
                for member emergencies only.

Version: 2.6.3i
Charset: noconv
Comment: http://www.auscert.org.au/render.html?it=1967