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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.3577 Linux kernel vulnerabilities 15 November 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: linux linux-aws linux-kvm linux-raspi2 linux-snapdragon Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Access Privileged Data -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-18021 CVE-2018-17972 CVE-2018-14617 CVE-2018-14609 CVE-2018-13096 CVE-2018-13053 CVE-2018-10880 Reference: ESB-2018.2698 ESB-2018.3036 ESB-2018.3057 Original Bulletin: http://www.ubuntu.com/usn/usn-3821-1 http://www.ubuntu.com/usn/usn-3821-2 Comment: This bulletin contains two (2) Ubuntu security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3821-1 November 14, 2018 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 16.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - - linux: Linux kernel - - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - - linux-kvm: Linux kernel for cloud environments - - linux-raspi2: Linux kernel for Raspberry Pi 2 - - linux-snapdragon: Linux kernel for Snapdragon processors Details: Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly ensure that xattr information remained in inode bodies. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash). (CVE-2018-10880) It was discovered that the alarmtimer implementation in the Linux kernel contained an integer overflow vulnerability. A local attacker could use this to cause a denial of service. (CVE-2018-13053) Wen Xu discovered that the f2fs filesystem implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13096) Wen Xu and Po-Ning Tseng discovered that the btrfs filesystem implementation in the Linux kernel did not properly handle relocations in some situations. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14609) Wen Xu discovered that the HFS+ filesystem implementation in the Linux kernel did not properly handle malformed catalog data in some situations. An attacker could use this to construct a malicious HFS+ image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14617) Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. (CVE-2018-17972) It was discovered that the KVM implementation in the Linux kernel on ARM 64bit processors did not properly handle some ioctls. An attacker with the privilege to create KVM-based virtual machines could use this to cause a denial of service (host system crash) or execute arbitrary code in the host. (CVE-2018-18021) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.4.0-1037-kvm 4.4.0-1037.43 linux-image-4.4.0-1072-aws 4.4.0-1072.82 linux-image-4.4.0-1100-raspi2 4.4.0-1100.108 linux-image-4.4.0-1104-snapdragon 4.4.0-1104.109 linux-image-4.4.0-139-generic 4.4.0-139.165 linux-image-4.4.0-139-generic-lpae 4.4.0-139.165 linux-image-4.4.0-139-lowlatency 4.4.0-139.165 linux-image-4.4.0-139-powerpc-e500mc 4.4.0-139.165 linux-image-4.4.0-139-powerpc-smp 4.4.0-139.165 linux-image-4.4.0-139-powerpc64-emb 4.4.0-139.165 linux-image-4.4.0-139-powerpc64-smp 4.4.0-139.165 linux-image-aws 4.4.0.1072.74 linux-image-generic 4.4.0.139.145 linux-image-generic-lpae 4.4.0.139.145 linux-image-kvm 4.4.0.1037.36 linux-image-lowlatency 4.4.0.139.145 linux-image-powerpc-e500mc 4.4.0.139.145 linux-image-powerpc-smp 4.4.0.139.145 linux-image-powerpc64-emb 4.4.0.139.145 linux-image-powerpc64-smp 4.4.0.139.145 linux-image-raspi2 4.4.0.1100.100 linux-image-snapdragon 4.4.0.1104.96 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: https://usn.ubuntu.com/usn/usn-3821-1 CVE-2018-10880, CVE-2018-13053, CVE-2018-13096, CVE-2018-14609, CVE-2018-14617, CVE-2018-17972, CVE-2018-18021 Package Information: https://launchpad.net/ubuntu/+source/linux/4.4.0-139.165 https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1072.82 https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1037.43 https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1100.108 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1104.109 - -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEpgY7tWAjCaQ8jrvULwmejQBegfQFAlvstPIACgkQLwmejQBe gfSvzg//Z22RdhmrA6GvsAljp39cDra3IC7IzTj0C8thQB5DHd8fkelCJPx3e6sF BKYL2jDPhiR5TnBaQObLK2CMEHjrclUleaybzGAVsKrkTnxhgTCBWo43Ij39wdyq pVKudPTW48YjXbV0aTie8FH35F5ePaBWdPyxsAlaIp24G9KJ+98fA+aVyJuX0tlp gzUZHsEXZURx1TiXb9m0s62Vdzg8L7+GW5gMAg85dqbPTpyzr5+wm7WZAAVW+ZOz xH/Dmo1H1ebOdnhgBnOKKbvLehnU98AD8WU8zej8vKIsl8/TdPf6Y5UZfuEHctBr BlmM3TYmk156+bvjr0BrJ5kqTwJ7ibSSZDJYAXfy02ZPCnlZ6bMbOg+75XQRSjM1 gZeYhKLQxVnayLywWMnMOtqZvg4S4831g3Cn2+2/T8PJk2PZyTsCWk7tJzfnkZCE 365iVGULQGJffPdNKf7lvARw/VwfgZ+Vx5FUnfeSQAOaySd8i9TGZfkYmb4SyKQb b8DIMQt3JEdZmWyfkKt04b0PLYedDaVD4DBHY21rMXeJ7zR0yioOXs8ClA250Qvo P47anwZS1rl/JLZ6RFSx/nGXzW+yxvn/VxYVMCzx2ArOZRl/3HN02rqWTMhZLG/s ZzH9gGYhptY3Kw3KO9wFCqCR/fRyXSqo3RUrjj1yBEsWIHxCFok= =95eM - -----END PGP SIGNATURE----- - -------------------------------------------------------------------------------- ========================================================================== Ubuntu Security Notice USN-3821-2 November 14, 2018 linux-lts-xenial, linux-aws vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty Details: USN-3821-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly ensure that xattr information remained in inode bodies. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash). (CVE-2018-10880) It was discovered that the alarmtimer implementation in the Linux kernel contained an integer overflow vulnerability. A local attacker could use this to cause a denial of service. (CVE-2018-13053) Wen Xu discovered that the f2fs filesystem implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13096) Wen Xu and Po-Ning Tseng discovered that the btrfs filesystem implementation in the Linux kernel did not properly handle relocations in some situations. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14609) Wen Xu discovered that the HFS+ filesystem implementation in the Linux kernel did not properly handle malformed catalog data in some situations. An attacker could use this to construct a malicious HFS+ image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14617) Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. (CVE-2018-17972) It was discovered that the KVM implementation in the Linux kernel on ARM 64bit processors did not properly handle some ioctls. An attacker with the privilege to create KVM-based virtual machines could use this to cause a denial of service (host system crash) or execute arbitrary code in the host. (CVE-2018-18021) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-4.4.0-1034-aws 4.4.0-1034.37 linux-image-4.4.0-139-generic 4.4.0-139.165~14.04.1 linux-image-4.4.0-139-generic-lpae 4.4.0-139.165~14.04.1 linux-image-4.4.0-139-lowlatency 4.4.0-139.165~14.04.1 linux-image-4.4.0-139-powerpc-e500mc 4.4.0-139.165~14.04.1 linux-image-4.4.0-139-powerpc-smp 4.4.0-139.165~14.04.1 linux-image-4.4.0-139-powerpc64-emb 4.4.0-139.165~14.04.1 linux-image-4.4.0-139-powerpc64-smp 4.4.0-139.165~14.04.1 linux-image-aws 4.4.0.1034.34 linux-image-generic-lpae-lts-xenial 4.4.0.139.119 linux-image-generic-lts-xenial 4.4.0.139.119 linux-image-lowlatency-lts-xenial 4.4.0.139.119 linux-image-powerpc-e500mc-lts-xenial 4.4.0.139.119 linux-image-powerpc-smp-lts-xenial 4.4.0.139.119 linux-image-powerpc64-emb-lts-xenial 4.4.0.139.119 linux-image-powerpc64-smp-lts-xenial 4.4.0.139.119 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: https://usn.ubuntu.com/usn/usn-3821-2 https://usn.ubuntu.com/usn/usn-3821-1 CVE-2018-10880, CVE-2018-13053, CVE-2018-13096, CVE-2018-14609, CVE-2018-14617, CVE-2018-17972, CVE-2018-18021 Package Information: https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1034.37 https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-139.165~14.04.1 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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 iQIVAwUBW+z2YWaOgq3Tt24GAQgkrBAAxxsbzyrk1Kr0VTQZS7MnXr766ftZnbPy OMAc2v1wzlnhes9cVTtsBa4LqNkUtL1x7IMIdFJDuR3NsfLQ0FoBFNCKMrxja6eq DyP+fTpjKsjNwtbBkMGl7hl2b6Vo22FkfrkNFWjdXYOuNrtSpkfTsr6oT0lINhie UEasQx17OmiR4kln6CmvlThI9MVaWRyVFOl0RucOWkmB5E28UdtZVvxdxm8gQMog FdKYd+O/GE27DfeG9OexSfGdmsa+SFrIiHV3x6Fle/1NuJA5YSQvDxkm0Pfulb5R dL4aNKm6UVLqmvwdF9kLcCfF4a6zFfKeVjEJwLmR4v9aY6i996/KA6SGXwSil+go hd6zn2DoyR1VWRr9KZy+6zuPuTXaEPJSy8Hzd6F+HR2ncJduNXdhwWXE0lKi8ujc Pr1Q20b67AZO7t3QlOdZVY6gwpDCQP/AoCcjLQS1iF/HuwKX+GWvzahkmmLOgGS4 tp02B0yb34eDQOp3URP+kmk0U+BlWr2MAlL+lrb7ntEJeuUu+ipIhkg2TXmjKF5L EGu2UBz92TYqMHNxBMvZsl5lrs68NLx20jDge49sJUanJ0MRGTEcnePJzEsbfU1+ +EmLDfIMqQAxH1OtS4gARTCtWS6OqgcQfSFS+dGsAFLUZPLt0bG91/cJhqe5fXea mW46FuqCHoY= =wkWL -----END PGP SIGNATURE-----