Vulnerability 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).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 4.14.8 |
| Canonical | Ubuntu Linux | 12.04 |
| Redhat | Mrg Realtime | 2.0 |
| Redhat | Enterprise Linux Desktop | 7.0 |
| Redhat | Enterprise Linux Server | 7.0 |
| Redhat | Enterprise Linux Server Aus | 7.2 |
| Redhat | Enterprise Linux Server Eus | 7.3 |
| Redhat | Enterprise Linux Server Tus | 7.2 |
| Redhat | Enterprise Linux Workstation | 7.0 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/104909Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1041414Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:2948Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3083Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3096Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3459Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3540Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3586Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3590Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3591Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8Third Party Advisory
- https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbPatchThird Party Advisory
- https://usn.ubuntu.com/3742-1/Third Party Advisory
- https://usn.ubuntu.com/3742-2/Third Party Advisory
- https://www.exploit-db.com/exploits/45175/ExploitThird Party AdvisoryVDB Entry
FAQ
What is CVE-2017-18344?
CVE-2017-18344 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ...
How severe is CVE-2017-18344?
CVE-2017-18344 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-18344?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Canonical Ubuntu Linux, Redhat Mrg Realtime, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server.