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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0106.2 USN-4233-1: GnuTLS update - marking SHA1 as untrusted 24 January 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: GnuTLS Publisher: Ubuntu Operating System: Ubuntu UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade Original Bulletin: https://usn.ubuntu.com/4233-1/ https://usn.ubuntu.com/4233-2/ Comment: This bulletin contains two (2) Ubuntu security advisories. Revision History: January 24 2020: Vendor released advisory USN-4233-2 January 10 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4233-1: GnuTLS update 9 January 2020 gnutls28 update A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Summary SHA1 has been marked as untrusted in GnuTLS. Software Description o gnutls28 - GNU TLS library Details As a security improvement, this update marks SHA1 as being untrusted for digital signature operations. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS libgnutls30 - 3.5.18-1ubuntu1.2 Ubuntu 16.04 LTS libgnutls30 - 3.4.10-4ubuntu1.6 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 LP: 1858691 - ---------------------------------------------------------------------------- USN-4233-2: GnuTLS update 23 January 2020 gnutls28 update A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Summary USN-4233-1 marked SHA1 as untrusted in GnuTLS with no workaround. Software Description o gnutls28 - GNU TLS library Details USN-4233-1 disabled SHA1 being used for digital signature operations in GnuTLS. In certain network environments, certificates using SHA1 may still be in use. This update adds the %VERIFY_ALLOW_BROKEN and %VERIFY_ALLOW_SIGN_WITH_SHA1 priority strings that can be used to temporarily re-enable SHA1 until certificates can be replaced with a stronger algorithm. Original advisory details: As a security improvement, this update marks SHA1 as being untrusted for digital signature operations. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS libgnutls30 - 3.5.18-1ubuntu1.3 Ubuntu 16.04 LTS libgnutls30 - 3.4.10-4ubuntu1.7 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 USN-4233-1 o LP: 1860656 - --------------------------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. 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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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