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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3099 [SECURITY] [DLA 1884-1] linux security update 14 August 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: linux Publisher: Debian Operating System: Debian GNU/Linux 8 Impact/Access: Root Compromise -- Existing Account Access Privileged Data -- Existing Account Denial of Service -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-14284 CVE-2019-14283 CVE-2019-13631 CVE-2019-10638 CVE-2019-10207 CVE-2019-3900 CVE-2019-1428 CVE-2019-1125 CVE-2018-20836 CVE-2017-18509 Reference: ASB-2019.0229 ESB-2019.3084 ESB-2019.3048 ESB-2019.2626 ESB-2019.2597 ESB-2019.2593 Original Bulletin: https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html - --------------------------BEGIN INCLUDED TEXT-------------------- Package : linux Version : 3.16.72-1 CVE ID : CVE-2017-18509 CVE-2018-20836 CVE-2019-1125 CVE-2019-3900 CVE-2019-10207 CVE-2019-10638 CVE-2019-13631 CVE-2019-14283 CVE-2019-14284 Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2017-18509 Denis Andzakovic reported a missing type check in the IPv4 multicast routing implementation. A user with the CAP_NET_ADMIN capability (in any user namespace) could use this for denial-of-service (memory corruption or crash) or possibly for privilege escalation. CVE-2018-20836 chenxiang reported a race condition in libsas, the kernel subsystem supporting Serial Attached SCSI (SAS) devices, which could lead to a use-after-free. It is not clear how this might be exploited. CVE-2019-1125 It was discovered that most x86 processors could speculatively skip a conditional SWAPGS instruction used when entering the kernel from user mode, and/or could speculatively execute it when it should be skipped. This is a subtype of Spectre variant 1, which could allow local users to obtain sensitive information from the kernel or other processes. It has been mitigated by using memory barriers to limit speculative execution. Systems using an i386 kernel are not affected as the kernel does not use SWAPGS. CVE-2019-3900 It was discovered that vhost drivers did not properly control the amount of work done to service requests from guest VMs. A malicious guest could use this to cause a denial-of-service (unbounded CPU usage) on the host. CVE-2019-10207 The syzkaller tool found a potential null dereference in various drivers for UART-attached Bluetooth adapters. A local user with access to a pty device or other suitable tty device could use this for denial-of-service (BUG/oops). CVE-2019-10638 Amit Klein and Benny Pinkas discovered that the generation of IP packet IDs used a weak hash function, "jhash". This could enable tracking individual computers as they communicate with different remote servers and from different networks. The "siphash" function is now used instead. CVE-2019-13631 It was discovered that the gtco driver for USB input tablets could overrun a stack buffer with constant data while parsing the device's descriptor. A physically present user with a specially constructed USB device could use this to cause a denial-of-service (BUG/oops), or possibly for privilege escalation. CVE-2019-14283 The syzkaller tool found a missing bounds check in the floppy disk driver. A local user with access to a floppy disk device, with a disk present, could use this to read kernel memory beyond the I/O buffer, possibly obtaining sensitive information. CVE-2019-14284 The syzkaller tool found a potential division-by-zero in the floppy disk driver. A local user with access to a floppy disk device could use this for denial-of-service (oops). (CVE ID not yet assigned) Denis Andzakovic reported a possible use-after-free in the TCP sockets implementation. A local user could use this for denial-of-service (memory corruption or crash) or possibly for privilege escalation. (CVE ID not yet assigned) The netfilter conntrack subsystem used kernel addresses as user-visible IDs, which could make it easier to exploit other security vulnerabilities. XSA-300 Julien Grall reported that Linux does not limit the amount of memory which a domain will attempt to balloon out, nor limits the amount of "foreign / grant map" memory which any individual guest can consume, leading to denial of service conditions (for host or guests). For Debian 8 "Jessie", these problems have been fixed in version 3.16.72-1. We recommend that you upgrade your linux packages. Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS - --------------------------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. 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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 iQIVAwUBXVNgYmaOgq3Tt24GAQjjIRAA0r+tZ2SMonXVyerGhpyJYiQkopC3XiBV Qk+Jjs+uxMRtTxCbHd6+PyCqb+/FCgpNSRwb/RJ6kP7bFQfTgsE4O5OchNSoSBqe aCGksqYBPa1E95tC/6HsGl0x497+H2y4XlwXSDP1bzUPfYM/AHYAGJZPYP4e0EBb FO7pka+2WvN5LO1KMgyxx7s5dffCBe0bGY8kaS+mvB2CbiFthO5CR1N88pRVazv5 u2Dkqp4zP3GftYsIT3xJQKjeDPpBO5TTZuUBUkBKEUAhnFgfRGjirPgJU5aJCU9Z J1qSbwu6S4U71Fl2YDsIZ7TJx3/PDwLWbpj+SMRjGPKPcydVrEO67ihVXcA7zUCF D0DfDR5O8HSmrjPIKCbnRo1Ozw1MMpStx9O95U4hUynSZ3ZHagyIBlg3udkxrpFa eAg7l23jLXd1uXHVJ0V2l1NG7E/EW2XqGEn1SaBLmpCVbjLx5BfsrQ94xFCBjb2/ yNGPTyRIWB6J2EGmvQVHqKoNF/W5JaGQup/cfRsq7WFJ8rjmLypIOJ3xUk6vXso5 lZHnpFfun92ycU6pgswPbMjcdjsmIwrTjX3RQSA90dYRf2RGES/8jsXP50EKdL9u m637KIW6rsTk5lzkZdXE4J+QCvdimfxUvLJtzTc8or2/wjX6ozmC9i/Fzs4seoSr my7kEPkF+bc= =bybo -----END PGP SIGNATURE-----