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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3170 USN-4504-1: OpenSSL vulnerabilities 17 September 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: OpenSSL Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Access Privileged Data -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-1968 CVE-2019-1563 CVE-2019-1551 CVE-2019-1547 Reference: ESB-2020.2383 ESB-2020.1889 Original Bulletin: https://usn.ubuntu.com/4504-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4504-1: OpenSSL vulnerabilities 16 September 2020 Several security issues were fixed in OpenSSL. Releases o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Packages o openssl - Secure Socket Layer (SSL) cryptographic library and tools o openssl1.0 - Secure Socket Layer (SSL) cryptographic library and tools Details Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky discovered that certain Diffie-Hellman ciphersuites in the TLS specification and implemented by OpenSSL contained a flaw. A remote attacker could possibly use this issue to eavesdrop on encrypted communications. This was fixed in this update by removing the insecure ciphersuites from OpenSSL. (CVE-2020-1968) Cesar Pereida Garcia, Sohaib ul Hassan, Nicola Tuveri, Iaroslav Gridin, Alejandro Cabrera Aldaya, and Billy Brumley discovered that OpenSSL incorrectly handled ECDSA signatures. An attacker could possibly use this issue to perform a timing side-channel attack and recover private ECDSA keys. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1547) Guido Vranken discovered that OpenSSL incorrectly performed the x86_64 Montgomery squaring procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1551) Bernd Edlinger discovered that OpenSSL incorrectly handled certain decryption functions. In certain scenarios, a remote attacker could possibly use this issue to perform a padding oracle attack and decrypt traffic. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1563) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 o libssl1.0.0 - 1.0.2n-1ubuntu5.4 Ubuntu 16.04 o libssl1.0.0 - 1.0.2g-1ubuntu4.17 After a standard system update you need to reboot your computer to make all the necessary changes. References o CVE-2019-1547 o CVE-2019-1551 o CVE-2019-1563 o CVE-2020-1968 Related notices o USN-4376-1 : libssl1.0.0, libssl1.1, openssl o USN-4376-2 : libssl1.0.0, openssl - --------------------------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. 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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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