CVE-2017-18344

moderate-risk
Published 2018-07-26

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).

Do I need to act?

!
11.9% chance of exploitation in next 30 days
EPSS score — higher than 88% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
!
1 public exploit available
45175
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (15)

Affected Vendors

Redhat Linux Canonical

References (30)

Third Party Advisory http://www.securityfocus.com/bid/104909
Third Party Advisory http://www.securitytracker.com/id/1041414
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2948
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3083
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3096
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3459
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3540
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3586
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3590
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3591
Third Party Advisory https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8
Patch https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efb...
Third Party Advisory https://usn.ubuntu.com/3742-1/
Third Party Advisory https://usn.ubuntu.com/3742-2/
Exploit https://www.exploit-db.com/exploits/45175/
Third Party Advisory http://www.securityfocus.com/bid/104909
Third Party Advisory http://www.securitytracker.com/id/1041414
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2948
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3083
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3096
and 10 more references
48
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 12/34 · Low
Exposure 18/34 · Moderate