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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4225 USN-5580-1: Linux kernel (AWS) vulnerabilities 26 August 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Linux kernel (AWS) Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2022-36946 CVE-2022-20368 CVE-2021-33656 CVE-2021-33655 Original Bulletin: https://ubuntu.com/security/notices/USN-5580-1 Comment: CVSS (Max): 9.8 CVE-2022-20368 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVSS Source: [NVD], Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- USN-5580-1: Linux kernel (AWS) vulnerabilities 24 August 2022 Several security issues were fixed in the Linux kernel. Releases o Ubuntu 16.04 ESM Packages o linux-aws - Linux kernel for Amazon Web Services (AWS) systems Details It was discovered that the framebuffer driver on the Linux kernel did not verify size limits when changing font or screen size, leading to an out-of- bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. ( CVE-2021-33655 ) It was discovered that the virtual terminal driver in the Linux kernel did not properly handle VGA console font changes, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. ( CVE-2021-33656 ) It was discovered that the Packet network protocol implementation in the Linux kernel contained an out-of-bounds access. A remote attacker could use this to expose sensitive information (kernel memory). ( CVE-2022-20368 ) Domingo Dirutigliano and Nicola Guerrera discovered that the netfilter subsystem in the Linux kernel did not properly handle rules that truncated packets below the packet header size. When such rules are in place, a remote attacker could possibly use this to cause a denial of service (system crash). ( CVE-2022-36946 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 o linux-image-4.4.0-1150-aws - 4.4.0-1150.165 Available with UA Infra or UA Desktop o linux-image-aws - 4.4.0.1150.154 Available with UA Infra or UA Desktop After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References o CVE-2022-36946 o CVE-2021-33656 o CVE-2021-33655 o CVE-2022-20368 Related notices o USN-5577-1 : linux-modules-iwlwifi-5.14.0-1049-oem, linux-image-oem-20.04b, linux-modules-5.14.0-1049-oem, linux-headers-5.14.0-1049-oem, linux-buildinfo-5.14.0-1049-oem, linux-tools-oem-20.04, linux-oem-5.14-tools-5.14.0-1049, linux-image-oem-20.04d, linux-headers-oem-20.04d, linux-image-oem-20.04c, linux-image-unsigned-5.14.0-1049-oem, linux-oem-20.04d, linux-tools-oem-20.04d, linux-headers-oem-20.04c, linux-headers-oem-20.04b, linux-image-5.14.0-1049-oem, linux-oem-5.14-headers-5.14.0-1049, linux-oem-20.04c, linux-tools-5.14.0-1049-oem, linux-oem-20.04, linux-tools-oem-20.04c, linux-modules-iwlwifi-oem-20.04, linux-oem-20.04b, linux-tools-oem-20.04b, linux-image-oem-20.04, linux-oem-5.14-tools-host, linux-modules-iwlwifi-oem-20.04d, linux-headers-oem-20.04, linux-oem-5.14 - --------------------------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: https://auscert.org.au/gpg-key/ iQIVAwUBYwg2OskNZI30y1K9AQj6zg//WNq3ETeElahuTO3oV5Tf1l7qhI6lfMQ9 7ss67BP2u9y758KRKj1SBs+B7C1LvGnooK1igl2W8wcgunzdqdejCtE/myY+mRv+ Tv1Oz1HYsqqBHk/9qBU1ifJBFOakSGrdpgxznU3mEySTfIGpYZCHxLE95JcT0hKi ch0i3Gv4VxnZ/CamCBXqGjCqWh2UsAOARIdciju4U+TdojFjQ3IvN28R9dYIL3Xk hiM2h63wOrN2iDJOcfj7UVVdcKTGKMc4/j3LBfaZftNjcCCsujIs3pj8C4z4Ds5O 1b7ujrEBcTOOYdGGTChXUwAKhuLi+Ua/HAnugZFMl0N2PWkjDQUgHgsavcMETKmn qM2ccPy3aGg0zG42QE0fPchuy9Y+f1o9DDhaN3N92rU4o0rqYTdDs7/mer02ph6c PMCI5k2k/VJ4bqnAAx2LIH1PdJDyY0vY8f/Ult4KcsGvTCElp6yETX6vbbLZQtNo FajmzTqPUT+LsfH/LrlGlQKwOVEic/PMC2JqNXjqRc4vTmzCvC8tiS2pFfznXqon 34Mv/LL7efuidS5snY+QfkSR6g1Qpd+QwC4aDj0p1rJ5OVHVf0bhha22UUGw+EqD 1lSKKjdXpu/GUF8PuI0mnf34KJLUbV1JUZKL997v+Ztt12mTMkQZhvdJ40eVn9wt CeGB4Sw3fY0= =U/em -----END PGP SIGNATURE-----