Improper input validation in Linux Kernel
CVE-2017-18509
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (56.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 16.04
- Debian Linux — versions 8.0, 9.0, 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- pulsesecurity.co.nz/advisories/linux-kernel-4.9-inetcsklistenstop-gpf (Exploit, Third Party Advisory)
- salsa.debian.org/kernel-team/linux/commit/baefcdc2f29923e7325ce4e1a72c3ff0a9800… (Third Party Advisory)
- lists.openwall.net/netdev/2017/12/04/40 (Mailing List, Third Party Advisory)
- github.com/torvalds/linux/commit/99253eb750fda6a644d5188fb26c43bad8d5a745 (Patch, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- www.debian.org/security/2019/dsa-4497 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/08/msg00016.html (mailing-list, Mailing List, Third Party Advisory)
- seclists.org/bugtraq/2019/Aug/26 (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/08/msg00017.html (mailing-list, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2… (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-18509?
- CVE-2017-18509 is a high-severity vulnerability in Linux Kernel, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2019-08-13.
- How severe is CVE-2017-18509?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2017-18509 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.