CVE-2017-18344 Information disclosure in n/a

What is CVE-2017-18344?

CVE-2017-18344 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 26 Jul 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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).

Weakness: CWE-125

Which versions are affected by CVE-2017-18344?

It affects 9 products.

Products include Canonical Ubuntu Linux, Linux kernel, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Eus and 3 more.

How do I fix CVE-2017-18344?

Apply the vendor's patch.

Is CVE-2017-18344 being exploited?

There is no known exploitation of CVE-2017-18344 in the wild and no public exploit code.

Public exploit code: 1 Exploit-DB entry.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2017-18344, GHSA-j9fr-8f9m-c9qc, UBUNTU-CVE-2017-18344.