ESB-2018.1758 - [Win][UNIX/Linux] OpenSSL: Denial of service - Remote with user interaction 2018-06-13

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             AUSCERT External Security Bulletin Redistribution

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

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        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

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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

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