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CVE-2017-18344

Status Candidate

Overview

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

Related Files

Ubuntu Security Notice USN-3742-3
Posted Aug 21, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3742-3 - USN-3742-2 introduced mitigations in the Linux Hardware Enablement kernel for Ubuntu 12.04 ESM to address L1 Terminal Fault vulnerabilities. Unfortunately, the update introduced regressions that caused kernel panics when booting in some environments as well as preventing Java applications from starting. This update fixes the problems. Various other issues were also addressed.

tags | advisory, java, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-18344, CVE-2018-3620, CVE-2018-3646, CVE-2018-5390, CVE-2018-5391
MD5 | 5184a56084d4f6684863c627c85bd1a7
Ubuntu Security Notice USN-3742-2
Posted Aug 15, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3742-2 - USN-3742-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 for Ubuntu 12.04 ESM. It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault. A local attacker in a guest virtual machine could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-18344, CVE-2018-3620, CVE-2018-3646, CVE-2018-5390, CVE-2018-5391
MD5 | 8765eb216afec68e03e4729f603e2423
Ubuntu Security Notice USN-3742-1
Posted Aug 15, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3742-1 - It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault. A local attacker in a guest virtual machine could use this to expose sensitive information. It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2017-18344, CVE-2018-3620, CVE-2018-3646, CVE-2018-5390, CVE-2018-5391
MD5 | 0bb27e1ab89c610a43b666ee9c098afd
Linux Kernel 4.14.7 (Ubuntu 16.04 / CentOS 7) Arbitrary File Read
Posted Aug 9, 2018
Authored by Andrey Konovalov

Linux Kernel version 4.14.7 (Ubuntu 16.04 / CentOS 7) arbitrary file read exploit with KASLR and SMEP bypass.

tags | exploit, arbitrary, kernel
systems | linux, ubuntu, centos
advisories | CVE-2017-18344
MD5 | 3979f56d7a233c067dd58ea0b8242822
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