cve/2017/CVE-2017-18509.md

CVE-2017-18509

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.

POC

Reference

• http://packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
• https://lists.openwall.net/netdev/2017/12/04/40
• https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-inetcsklistenstop-gpf

Github

• https://github.com/TinyNiko/android_bulletin_notes