Out-of-bounds Read Affecting kernel-rt-debug-kvm package, versions <0:3.10.0-957.rt56.910.el7
Threat Intelligence
Snyk has a published code exploit for this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS7-KERNELRTDEBUGKVM-2110329
- published26 Jul 2021
- disclosed15 Dec 2017
Introduced: 15 Dec 2017
CVE-2017-18344 (opens in a new tab)How to fix?
Upgrade Centos:7 kernel-rt-debug-kvm to version 0:3.10.0-957.rt56.910.el7 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
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).
References
- http://www.securityfocus.com/bid/104909
- https://access.redhat.com/security/cve/CVE-2017-18344
- https://www.exploit-db.com/exploits/45175/
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8
- https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe
- https://access.redhat.com/errata/RHSA-2018:3096
- http://www.securitytracker.com/id/1041414
- https://usn.ubuntu.com/3742-1/
- https://usn.ubuntu.com/3742-2/
- https://www.exploit-db.com/exploits/45175