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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0459 USN-4728-1: snapd vulnerability 10 February 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: snapd Publisher: Ubuntu Operating System: Ubuntu Linux variants Impact/Access: Increased Privileges -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-27352 Original Bulletin: https://ubuntu.com/security/notices/USN-4728-1 Comment: This advisory references vulnerabilities in products which run on platforms other than Ubuntu. It is recommended that administrators running snapd check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4728-1: snapd vulnerability 10 February 2021 An intended access restriction in snapd could be bypassed by container management snaps. Releases o Ubuntu 20.10 o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Packages o snapd - Daemon and tooling that enable snap packages Details Gilad Reti discovered that snapd did not correctly specify cgroup delegation when generating systemd service units for various container management snaps. This could allow a local attacker to escalate privileges via access to arbitrary devices of the container host from within a compromised or malicious container. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10 o snapd - 2.48.3+20.10 Ubuntu 20.04 o snapd - 2.48.3+20.04 Ubuntu 18.04 o snapd - 2.48.3+18.04 Ubuntu 16.04 o snapd - 2.48.3 In general, a standard system update will make all the necessary changes. On Ubuntu, snapd will automatically refresh itself to snapd 2.48.3 which is unaffected. Affected container management snaps will also automatically refresh which will restart containers and resolve this vulnerability. References o CVE-2020-27352 - --------------------------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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