CVE-2017-18344

Public Exploit

Description

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).

Category

5.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 8.64% Top 10%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2018:3540 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2018:3083 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2018:3591 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2018:3459 third party advisory vendor advisory
http://www.securitytracker.com/id/1041414 vdb entry third party advisory
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8 third party advisory
https://access.redhat.com/errata/RHSA-2018:3590 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2018:2948 third party advisory vendor advisory
https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe third party advisory patch
https://usn.ubuntu.com/3742-2/ third party advisory vendor advisory
http://www.securityfocus.com/bid/104909 vdb entry third party advisory
https://usn.ubuntu.com/3742-1/ third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2018:3586 third party advisory vendor advisory
https://www.exploit-db.com/exploits/45175/ exploit vdb entry third party advisory
https://access.redhat.com/errata/RHSA-2018:3096 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-18344?
CVE-2017-18344 has been scored as a medium severity vulnerability.
How to fix CVE-2017-18344?
To fix CVE-2017-18344, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-18344 being actively exploited in the wild?
It is possible that CVE-2017-18344 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~9% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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