23 June 2017
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1584 OpenVPN vulnerabilities 23 June 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: openvpn Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Access Privileged Data -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-7521 CVE-2017-7520 CVE-2017-7512 CVE-2017-7508 CVE-2017-7479 CVE-2016-6329 Reference: ASB-2016.0098 ESB-2017.1561 ESB-2016.2898 ESB-2016.2379 Original Bulletin: http://www.ubuntu.com/usn/usn-3339-1 - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3339-1 June 22, 2017 openvpn vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 17.04 - - Ubuntu 16.10 - - Ubuntu 16.04 LTS - - Ubuntu 14.04 LTS Summary: Several security issues were fixed in OpenVPN. Software Description: - - openvpn: virtual private network software Details: Karthikeyan Bhargavan and GaÃƒÂ«tan Leurent discovered that 64-bit block ciphers are vulnerable to a birthday attack. A remote attacker could possibly use this issue to recover cleartext data. Fixing this issue requires a configuration change to switch to a different cipher. This update adds a warning to the log file when a 64-bit block cipher is in use. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-6329) It was discovered that OpenVPN incorrectly handled rollover of packet ids. An authenticated remote attacker could use this issue to cause OpenVPN to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-7479) Guido Vranken discovered that OpenVPN incorrectly handled certain malformed IPv6 packets. A remote attacker could use this issue to cause OpenVPN to crash, resulting in a denial of service. (CVE-2017-7508) Guido Vranken discovered that OpenVPN incorrectly handled memory. A remote attacker could use this issue to cause OpenVPN to crash, resulting in a denial of service. (CVE-2017-7512) Guido Vranken discovered that OpenVPN incorrectly handled an HTTP proxy with NTLM authentication. A remote attacker could use this issue to cause OpenVPN clients to crash, resulting in a denial of service, or possibly expose sensitive memory contents. (CVE-2017-7520) Guido Vranken discovered that OpenVPN incorrectly handled certain x509 extensions. A remote attacker could use this issue to cause OpenVPN to crash, resulting in a denial of service. (CVE-2017-7521) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 17.04: openvpn 2.4.0-4ubuntu1.3 Ubuntu 16.10: openvpn 2.3.11-1ubuntu2.1 Ubuntu 16.04 LTS: openvpn 2.3.10-1ubuntu2.1 Ubuntu 14.04 LTS: openvpn 2.3.2-7ubuntu3.2 In general, a standard system update will make all the necessary changes. References: https://www.ubuntu.com/usn/usn-3339-1 CVE-2016-6329, CVE-2017-7479, CVE-2017-7508, CVE-2017-7512, CVE-2017-7520, CVE-2017-7521 Package Information: https://launchpad.net/ubuntu/+source/openvpn/2.4.0-4ubuntu1.3 https://launchpad.net/ubuntu/+source/openvpn/2.3.11-1ubuntu2.1 https://launchpad.net/ubuntu/+source/openvpn/2.3.10-1ubuntu2.1 https://launchpad.net/ubuntu/+source/openvpn/2.3.2-7ubuntu3.2 - --------------------------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 email@example.com 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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org 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 iQIVAwUBWUxbVYx+lLeg9Ub1AQgCkA//e6kMWKzxmRKKwxo1lSNDjqhDbTQJqsyJ RvELaZS4M+OR3B4cpltGsRAeowgaarQLy3pElNL4/ECPB0rAs+T2fpWlrbmCRhBO DKV4oRnsDLuCOCdHZjVCakhLveqRZOQMEveutPg/o+7vhhAllJZQyM8IqHxNPRYt GGx61uJTUH0dAncN9lEEmSxwosl9AQdeIvslGSbTKIqFN2xA3TSFUhXRJ2L1h1sl H3WQh9ltkla+QASpGGPlhwsMLIcuM/NRCBR5nzDySNnwsBZn7EKc6fFZ30QHaLfM 3pV1ahrDk3J8urlAkntSngG5Ht5eipJMN3fS/WoJ8cdl2jFvyRwBgYibauKjJlY/ jVNLKgk297ePyPHHXOA1pgjrJ55eFyXc0Qx9STEODf5Qatp5O3PlkSE6MPxuW47b VkWFfRKguYthLkOVydRaYvC5vlA4BjALVj8Js2MR7H+YoAxUZFWAOba4uyQOr2rf ASumMpWlUtEda1kTsApyUq9j4YKB2WpUdwfft0x2C7Sbi+POIbvcL4oQmC9qVxS2 FXYX3j4YvDJQ9X3epRbvHcbI0Qg4eHF1ZI06IsFJLe7X/6Rdu+FceiVnDPASBPcp oRAELDQ2w/vOFVMiZWzwxvsxKTTwhvee2/OUILZFMbGcFyQkuNI1a3mBfMRSZteA KJZjFRtDiJA= =Wqr4 -----END PGP SIGNATURE-----