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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4372 USN-4196-1: python-ecdsa vulnerabilities 19 November 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: python-ecdsa Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Access Privileged Data -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-14859 CVE-2019-14853 Reference: ESB-2019.4090 ESB-2019.4035 Original Bulletin: https://usn.ubuntu.com/4196-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4196-1: python-ecdsa vulnerabilities 18 November 2019 python-ecdsa vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 19.10 o Ubuntu 19.04 o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Summary Several security issues were fixed in python-ecdsa. Software Description o python-ecdsa - ECDSA cryptographic signature library Details It was discovered that python-ecdsa incorrectly handled certain signatures. A remote attacker could possibly use this issue to cause python-ecdsa to generate unexpected exceptions, resulting in a denial of service. (CVE-2019-14853) It was discovered that python-ecdsa incorrectly verified DER encoding in signatures. A remote attacker could use this issue to perform certain malleability attacks. (CVE-2019-14859) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 19.10 python-ecdsa - 0.13.2-2ubuntu0.1 python3-ecdsa - 0.13.2-2ubuntu0.1 Ubuntu 19.04 python-ecdsa - 0.13-3ubuntu0.1 python3-ecdsa - 0.13-3ubuntu0.1 Ubuntu 18.04 LTS python-ecdsa - 0.13-2ubuntu0.18.04.1 python3-ecdsa - 0.13-2ubuntu0.18.04.1 Ubuntu 16.04 LTS python-ecdsa - 0.13-2ubuntu0.16.04.1 python3-ecdsa - 0.13-2ubuntu0.16.04.1 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-2019-14853 o CVE-2019-14859 - --------------------------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). 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