CVE-2017-18509 Memory corruption in n/a
A local attacker with specific capabilities can trigger a general protection fault or execute arbitrary code in the Linux kernel via IPv6 multicast routing.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-18509?
CVE-2017-18509 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 13 Aug 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in net/ipv6/ip6mr.c in the Linux kernel before 4.11. By setting a specific socket option, an attacker can control a pointer in kernel land and cause an inet_csk_listen_stop general protection fault, or potentially execute arbitrary code under certain circumstances. The issue can be triggered as root (e.g., inside a default LXC container or with the CAP_NET_ADMIN capability) or after namespace unsharing. This occurs because sk_type and protocol are not checked in the appropriate part of the ip6_mroute_* functions. NOTE: this affects Linux distributions that use 4.9.x longterm kernels before 4.9.187.
Weakness: CWE-20
Which versions are affected by CVE-2017-18509?
It affects 3 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel.
How do I fix CVE-2017-18509?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2017-18509 being exploited?
There is no known exploitation of CVE-2017-18509 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as A-172999675, ASB-A-172999675, DEBIAN-CVE-2017-18509, GHSA-32qx-4wxm-fcw8, UBUNTU-CVE-2017-18509.