Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2446 USN-5013-1: systemd vulnerabilities 21 July 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: systemd Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Denial of Service -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-33910 CVE-2020-13529 Reference: ESB-2021.2438 Original Bulletin: https://ubuntu.com/security/notices/USN-5013-1 https://ubuntu.com/security/notices/USN-5013-2 Comment: This bulletin contains two (2) Ubuntu security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- USN-5013-1: systemd vulnerabilities 20 July 2021 Several security issues were fixed in systemd. Releases o Ubuntu 21.04 o Ubuntu 20.10 o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS Packages o systemd - system and service manager Details It was discovered that systemd incorrectly handled certain mount paths. A local attacker could possibly use this issue to cause systemd to crash, resulting in a denial of service. ( CVE-2021-33910 ) Mitchell Frank discovered that systemd incorrectly handled DHCP FORCERENEW packets. A remote attacker could possibly use this issue to reconfigure servers. ( CVE-2020-13529 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04 o systemd - 247.3-3ubuntu3.4 Ubuntu 20.10 o systemd - 246.6-1ubuntu1.7 Ubuntu 20.04 o systemd - 245.4-4ubuntu3.10 Ubuntu 18.04 o systemd - 237-3ubuntu10.49 After a standard system update you need to reboot your computer to make all the necessary changes. References o CVE-2020-13529 o CVE-2021-33910 Related notices o USN-5013-2 : libudev1-udeb, libnss-resolve, libsystemd-dev, libsystemd0, systemd-container, systemd, systemd-sysv, libudev-dev, systemd-coredump, libnss-mymachines, libnss-myhostname, libudev1, systemd-journal-remote, udev-udeb, libpam-systemd, udev - -------------------------------------------------------------------------------- USN-5013-2: systemd vulnerabilities 20 July 2021 Several security issues were fixed in systemd. Releases o Ubuntu 16.04 ESM Packages o systemd - system and service manager Details USN-5013-1 fixed several vulnerabilities in systemd. This update provides the corresponding update for Ubuntu 16.04 ESM. Original advisory details: It was discovered that systemd incorrectly handled certain mount paths. A local attacker could possibly use this issue to cause systemd to crash, resulting in a denial of service. ( CVE-2021-33910 ) Mitchell Frank discovered that systemd incorrectly handled DHCP FORCERENEW packets. A remote attacker could possibly use this issue to reconfigure servers. ( CVE-2020-13529 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 o systemd - 229-4ubuntu21.31+esm1 Available with UA Infra or UA Desktop After a standard system update you need to reboot your computer to make all the necessary changes. References o CVE-2020-13529 o CVE-2021-33910 Related notices o USN-5013-1 : systemd-journal-remote, udev-udeb, systemd-sysv, libudev-dev, libnss-mymachines, libudev1-udeb, libpam-systemd, libnss-systemd, libnss-myhostname, udev, systemd-coredump, libudev1, libsystemd0, systemd-timesyncd, systemd-tests, libsystemd-dev, libnss-resolve, systemd-container, systemd - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYPeWcuNLKJtyKPYoAQhvqxAAjzJ8B4Set/hqUknsIutYufot4e5Ff96B 0ijADGx7o9oB/KE6+ZfQa72jvXZ4EiiMn5MJLkmiiOe43bu+akXVzh30jpukIG3s 6oe0nYbzHmpEOScs+9pLI5LtVz2RxEDGDvemBbpZAmNkY91ug0irnlxW9oau4Oc6 y4KDsiSTKM4rTrvizZP7zQDgG1Y8a6Vx6PILS92nu0OIBVgLJGL1ETBX16z4RXPg sSb4nYuXUVailxZD3VEJAtbWFnchzjOf1JTkFuKvH4/TLLqCDDjKQsPGzCQIZiLT m/2DzOqPIdfxqiZDtYnfIsWx7YK6evtm//7GbpXLuJnP6ugOpniTyuKY6gzHrw8i OjzRItKeAsMq6wJcUiY9Z/wGaeRORvcQDOUbp01Cv84aaNNE5X/NpNHT8Y8s3zf/ zkH2KD18xx50yFjx7jydHhjKO8NijaTsJo0hIHNdo6/4Nmtayx5t4Unp2oAoGyOC PZoxi1rRqcGP14e4noCNdw4qPmqS7t1kwhAVFL80Gx1R/SlyFw3zHs4b3BH5dOI3 DAEezw07YpeZ55zCh1VLdCOVJ3nSxSOP5kQ/xOPzb3f3U48tjjz8l0tydPgd2/iV SX5b/pD7nGYrOfcaqC63FVqcpDEWeXgjWTFFihE9rQqmZTWWn2j4Z1eDC2RO1wz5 aj+CgD90rYk= =wWX2 -----END PGP SIGNATURE-----