-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1758
              OpenSSL -- Client DoS due to large DH parameter
                               13 June 2018

===========================================================================

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

Product:           OpenSSL
Publisher:         FreeBSD
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0732  

Original Bulletin: 
   https://www.vuxml.org/freebsd/c82ecac5-6e3f-11e8-8777-b499baebfeaf.html

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

OpenSSL -- Client DoS due to large DH parameter

Affected packages

openssl 	< 1.0.2o_4,1
openssl-devel 	< 1.1.0h_2

Details

VuXML ID    c82ecac5-6e3f-11e8-8777-b499baebfeaf
Discovery   2018-06-12
Entry       2018-06-12

The OpenSSL project reports:

    During key agreement in a TLS handshake using a DH(E) based ciphersuite a
    malicious server can send a very large prime value to the client. This will
    cause the client to spend an unreasonably long period of time generating a
    key for this prime resulting in a hang until the client has finished. This
    could be exploited in a Denial Of Service attack.

References

CVE Name    CVE-2018-0732
URL 	    https://www.openssl.org/news/secadv/20180612.txt

- --------------------------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.

NOTE: Third Party Rights
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 follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

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:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=RZfI
-----END PGP SIGNATURE-----