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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.3006 Exim vulnerability 28 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: exim4 Publisher: Ubuntu Operating System: Ubuntu Linux variants Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-16943 Original Bulletin: http://www.ubuntu.com/usn/usn-3493-1 Comment: This advisory references vulnerabilities in products which run on platforms other than Ubuntu. It is recommended that administrators running exim4 check for an updated version of the software for their operating system. Please note: There is exploit code publically available for this vulnerablity. - --------------------------BEGIN INCLUDED TEXT-------------------- USN-3493-1: Exim vulnerability Ubuntu Security Notice USN-3493-1 27th November, 2017 exim4 vulnerability A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 17.10 Ubuntu 17.04 Summary Exim could be made to crash or run programs if it received specially crafted network traffic. Software description exim4 - Exim is a mail transport agent Details It was discovered that Exim incorrectly handled memory in the ESMTP CHUNKING extension. A remote attacker could use this issue to cause Exim to crash, resulting in a denial of service, or possibly execute arbitrary code. The default compiler options for affected releases should reduce the vulnerability to a denial of service. Update instructions The problem can be corrected by updating your system to the following package version: Ubuntu 17.10: exim4-daemon-heavy 4.89-5ubuntu1.1 exim4-daemon-light 4.89-5ubuntu1.1 Ubuntu 17.04: exim4-daemon-heavy 4.88-5ubuntu1.2 exim4-daemon-light 4.88-5ubuntu1.2 To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades. In general, a standard system update will make all the necessary changes. References CVE-2017-16943 - --------------------------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 iQIVAwUBWhyWXox+lLeg9Ub1AQgnIxAAqFun7Yc+O/9l8Erv5vsg9DJvs23mJere OyCbKTmDVlgkU3nB+j6T2mpwn9+7LghRVhd5fu1nfkgJ/cxZfvU+Bmx7+y0uxmxG k/fqpNQ7R/enOUV1t8qZTraVN+iMoYMWFQqy5n0O3OiEqBv0YvGFo5JhOKjFaSEH Fg2hMWvjdFZ1RIkyZc3fgVI67zriJCuc2pRus+BYZfYC3ZBw8i+RHdAEwemGtS5C 5EwhrwtAKOuufLm1qB2whjan9eVsi2H8MKedWTkJ3bL2H0fLTYZ1uHrDAs/p9SBT AXbKF9H8tMIhBs6CXZ8lUyXGQOcyiPYLqOTrdIGtDcMhOU19rxtZUKXx07o5xyUs pY4UDXRZG4hj16ZgaSzVh/1HqqTnfLHNFW7xZVEIw5+3kLwRpQ+aJ7PYtQhCiZ6Y zCG1r35xoCoayfv5CydrFaoIhUylce/jpvb4t7STZ4EAnNzUmiH1aG8BM1gt8c0T MXMu2AElphrtkFkz4JcprLUp7PDfcrIqAj/EIrPQM7Spw9k9j0osqbm76y48ez1g 24gMTQeeFh6UPiNiEvztmAbrHjDaVyeoyvglLWBl1ORej3WacwmdnzPyZQo01TMz FLSay4V1KboDa6D+hkrKXOIBTmY6Or9uXBQzl8rseqpWAO3FdCgRwkdB3BUCBvt/ 5zmiW7atf48= =zpV/ -----END PGP SIGNATURE-----