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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.3079 exim4 security update 1 December 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: exim4 Publisher: Debian Operating System: Debian GNU/Linux 9 Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-16944 CVE-2017-16943 Reference: ESB-2017.3036 ESB-2017.3016 Original Bulletin: http://www.debian.org/security/2017/dsa-4053 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - - ------------------------------------------------------------------------- Debian Security Advisory DSA-4053-1 security@debian.org https://www.debian.org/security/ Salvatore Bonaccorso November 30, 2017 https://www.debian.org/security/faq - - ------------------------------------------------------------------------- Package : exim4 CVE ID : CVE-2017-16943 CVE-2017-16944 Debian Bug : 882648 882671 Several vulnerabilities have been discovered in Exim, a mail transport agent. The Common Vulnerabilities and Exposures project identifies the following issues: CVE-2017-16943 A use-after-free vulnerability was discovered in Exim's routines responsible for parsing mail headers. A remote attacker can take advantage of this flaw to cause Exim to crash, resulting in a denial of service, or potentially for remote code execution. CVE-2017-16944 It was discovered that Exim does not properly handle BDAT data headers allowing a remote attacker to cause Exim to crash, resulting in a denial of service. For the stable distribution (stretch), these problems have been fixed in version 4.89-2+deb9u2. Default installations disable advertising the ESMTP CHUNKING extension and are not affected by these issues. We recommend that you upgrade your exim4 packages. For the detailed security status of exim4 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/exim4 Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEERkRAmAjBceBVMd3uBUy48xNDz0QFAlofuHlfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDQ2 NDQ0MDk4MDhDMTcxRTA1NTMxRERFRTA1NENCOEYzMTM0M0NGNDQACgkQBUy48xND z0T0mw/+Mze38efCqxBiAaQcM0i6SG5/B47CAsioeWyc06a8MQtOqjs+picslsDu Z3XM+zA4aRSHQs0APowF8mlcSfMLvtaHWIy7zmxAv+LuBvZ/otvxZwWGVfJ0SYEl ZDvvLZT1SZZfFsB4n2zUcGZSHm2Tt1tYXOjWpi53jwuqWVuO4kdo7oOcapYCabsp OMRLDBaH4+AFisr+zN215DNn71m4RfI1SyL902/RaCvxOiMDyNCbH7tg7PLLYyqi vPJrOMcVKtkRAeoVPo5HckWrxRzNiDvY16R+pFDretB+mIB0ncWIXQ+GTjFDSeVa HNC5t/vWhYdzl5mpdF5YpsgrCa2Ot2bBQkajBsC4FvTT7cW9V6fHzz3gCsl8zBkM aFTEsm7yUn3Ef+lsX4KI9cj6G9f7O+3B4h4r9h/XM3/z7qwcZi2vWwYhG8jrGddF yTRLqp4fbJTjG13c9wCRAR4K0gBfOSzYdzc4dn0mI0OrUoijl9nqkPmXdoWNyfO2 UUYZHIuYlDCSqVWpjzWtujNu8MYM95AYzcC9/UkKXOpljzrhQYRxgee3/VGVdeFP pwumIMin3XFg/ahOFZ2L5Jvy2HaL9gAj1DfhHgAuIkuCcavgxDsZBM8bzOODY0HC 0F8plwbMeBgt3YlxI8YPvWx56PBtzy/zBvd+aSbS2ZgRETOgXeY= =0OFH - -----END PGP SIGNATURE----- - --------------------------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). 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