UBUNTU-CVE-2017-18344
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/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).
02 / AFFECTED SOFTWARE
Affected packages
134 explicit affected versions
10 explicit affected versions
50 explicit affected versions
71 explicit affected versions
31 explicit affected versions
15 explicit affected versions
9 explicit affected versions
15 explicit affected versions
34 explicit affected versions
11 explicit affected versions
45 explicit affected versions
42 explicit affected versions
26 explicit affected versions
51 explicit affected versions
6 explicit affected versions
12 explicit affected versions
1 explicit affected versions
1 explicit affected versions
23 explicit affected versions
1 explicit affected versions
3 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$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).
05 / REFERENCES
Further evidence
- http://www.openwall.com/lists/oss-security/2018/08/09/6
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8
- https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe
- https://ubuntu.com/security/CVE-2017-18344
- https://ubuntu.com/security/notices/USN-3742-1
- https://ubuntu.com/security/notices/USN-3742-2
- https://www.cve.org/CVERecord?id=CVE-2017-18344