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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.1945 USN-3999-1: GnuTLS vulnerabilities 31 May 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: GnuTLS Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Access Privileged Data -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-3836 CVE-2019-3829 CVE-2018-10846 CVE-2018-10845 CVE-2018-10844 Reference: ESB-2019.1477 ESB-2019.1089 ESB-2019.0545 ESB-2018.3904 Original Bulletin: https://usn.ubuntu.com/3999-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-3999-1: GnuTLS vulnerabilities 30 May 2019 gnutls28 vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 19.04 o Ubuntu 18.10 o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Summary Several security issues were fixed in GnuTLS. Software Description o gnutls28 - GNU TLS library Details Eyal Ronen, Kenneth G. Paterson, and Adi Shamir discovered that GnuTLS was vulnerable to a timing side-channel attack known as the "Lucky Thirteen" issue. A remote attacker could possibly use this issue to perform plaintext-recovery attacks via analysis of timing data. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-10844, CVE-2018-10845, CVE-2018-10846) Tavis Ormandy discovered that GnuTLS incorrectly handled memory when verifying certain X.509 certificates. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS, Ubuntu 18.10, and Ubuntu 19.04. (CVE-2019-3829) It was discovered that GnuTLS incorrectly handled certain post-handshake messages. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.10 and Ubuntu 19.04. (CVE-2019-3836) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04 libgnutls30 - 3.6.5-2ubuntu1.1 Ubuntu 18.10 libgnutls30 - 3.6.4-2ubuntu1.2 Ubuntu 18.04 LTS libgnutls30 - 3.5.18-1ubuntu1.1 Ubuntu 16.04 LTS libgnutls30 - 3.4.10-4ubuntu1.5 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-2018-10844 o CVE-2018-10845 o CVE-2018-10846 o CVE-2019-3829 o CVE-2019-3836 - --------------------------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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXPBW5maOgq3Tt24GAQhG3w/9HjCeXU9iP5wlduAdIV3gIASCZH//xmvH 6C4ls1NxPvRSYw2q/SSvJ6IqIIPXPzsYeKYYq3Vot/GbDS1TMEfsXk09+rV5YIpp 0hjq4b+BKnJamwKSCITqukHElxPqi+QscmehbOU6YDVEkFmHDj+94SmaqUu+e8bk 190YDz+EfvWsEqRDzV2hmkZFOw7fs0qhpX+JOiZNVNA0HGSbNnMiZTj1xlYaAN/4 XSe0HaGlmGZtr8R5Jg8GCJnL38w/CN0Em+HilPt5yBRwmnFbxD2i39aM0jl6zFhy uKYqHTh3sv1ufBfj+7zs41rhJZCo4CZAVLEH71aUlKFQ+3/G/7JqpKz1IheQ+X5W J4QJ8GylKeMezrKTY7tz4blbuTIaHVlUImeqViHsI8wz01hIrWdDaONAonnrVrSY zYhIXsstbEVijCgfLgRPfCsw8hKi3bKRaGfmFCLl5mUTceWOvbgYCZqYAZiCjm2i KCMr87jzoyA0TM6EKWr02aaP50GdXZsWkumJrTA18skSP7Vjd2mBNI/2Dztp3EZY 6IEBuLyw072Ro5eGkh2qbvlUuNiJMCNuNcofGwB5I8v9faZaTOtKmDDndeGCqZlS Qj+Z30F92kJUtLmhds3+SYBimXhyKxsJPXlW6j90T3vuxTqMcSqwY5Ob5QpDsy07 dGUDmlG81F4= =YNdT -----END PGP SIGNATURE-----