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-----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 iQIVAwUBWyCg7maOgq3Tt24GAQhURBAAgmilGSnzpp6qDjtsjp+91fUOouqvtBJn C0anpZQPBwSPA3x4GgQ642Mmz7MVuwgnHIr8JBElbv2cbsbUn/QfwEvJBcjWHyMn vdCzKvQ11etLCprNyCjeNpPr5kR6U4+aQ5Mp0m8nT0QMQLYas3UsHKil8150gem8 D9JwbOYZZxvdh5XGxECTTx/C/CB5MmSSFpLQwzGGDwdWP9Brtgw12XTT2f8U0eSH tTzqiyS+0pQYuQGrP5XpyY4XvuIWrVHqzotJ/QZsXZUa0PNdNxVjkE7DEnXm1aDu 4OuHZTKCHkjFMS9Mag4C8CpqoHih8odaO/AuT+KfxZG7w7mHNp4pVuefVah03xhY Gv24z0+IJ6MBi+3RrFO8F6zILVLZocpgfd2WzRQe8CmIqPCM05a0rxB/nNkk6f1k kJqNv35LIpGwJgWbgs29cIfBlIzdf5Ovz8z7StUQWDkpIwKUHcRqzqginZiqYXmA lrk1pjwx1N4UMmzqRkJE7lfc5pvo5TxqVswqV5LCICXWeB1c/Ju/V3/BYw2n4DBp dh/R6h9Ha5lsVMjxI1vv9NT7dblgrz7G7kdWF710rrDkQcsgNjLp6jJPB25RkyiO iNWKFpsOVz0hsd1+8TeJa65L4QYXicUTvo/VNU2XN9unYeEtcDKwFr4y6gBxzRUm 671rt+vAeRQ= =RZfI -----END PGP SIGNATURE-----