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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0238 USN-4246-1: zlib vulnerabilities 23 January 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: zlib Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Denial of Service -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2016-9843 CVE-2016-9842 CVE-2016-9841 CVE-2016-9840 Original Bulletin: https://usn.ubuntu.com/4246-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4246-1: zlib vulnerabilities 22 January 2020 zlib vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 16.04 LTS Summary Several security issues were fixed in zlib Software Description o zlib - Lossless data-compression library Details It was discovered that zlib incorrectly handled pointer arithmetic. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841) It was discovered that zlib incorrectly handled vectors involving left shifts of negative integers. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9842) It was discovered that zlib incorrectly handled vectors involving big-endian CRC calculation. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9843) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS lib32z1 - 1:1.2.8.dfsg-2ubuntu4.3 lib64z1 - 1:1.2.8.dfsg-2ubuntu4.3 libn32z1 - 1:1.2.8.dfsg-2ubuntu4.3 libx32z1 - 1:1.2.8.dfsg-2ubuntu4.3 zlib1g - 1:1.2.8.dfsg-2ubuntu4.3 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 o CVE-2016-9840 o CVE-2016-9841 o CVE-2016-9842 o CVE-2016-9843 - --------------------------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 iQIVAwUBXikTRmaOgq3Tt24GAQiqvw/8C7jxo5RZc4SDqYtDHp+qAWUP/wZXrDFP 6rn31vbWfGRTCqhElYkEMyDS/uW0+VdI9OMeu8XJW+wtQQqAJFR5j19asp/rVZ/S mGxRPWP0RZ98pxgWq1BbHs64yxPiDT53DPhPADpLE/4oJTStl4vr4Al8xAdlQ1/D hM5P0dpxvraHr0llToTha1521LnjuP/hF1gGkcMMZpHakMIH9syAJfxn1pc2Rbc8 XCn84Kb8VsQGR+Ik9KqR4Ka+KjDpYvpA0nod6eAlttOXOIGNpXiUHMUBXM/g8B0F XlEBvQgb4EORNX390HKPR763ZifCuljv9zpvyOI8xexc0sfnbiwl3mTh5rwjYvYP kKr9f4nh5TV4pX6z2rKbgtPauxEe22/yDz+w+F5oTWRzXSXNc0oRtQVqTa3igMPt rSsKJoZ+Yh3pW4IcVQMAsl0NINcmMISq1/EDZmZKHBsSE4nRpZV/BXkpp5sNEFvC N4iIaFgvncowDCxfG8I2iHw/NAgnDpy3AuCaMNqB6FgsglfXU3c0BR7xJFPOt0nK NMyYf62uaYLqraXKARtBfrpME8hpcT8dZBa9V3eDnw5wv0E7q4iQkz8Qk4AR5C3+ QXlu3hgABFZPewAOIYdkZAOuA8CL14C+xhapqO4LS469ZElLdW+XN1IiOgirbd4K K/5VbJ5yc5k= =Xfyb -----END PGP SIGNATURE-----