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CVE-2017-18509

7.8 · HIGH

An issue was discovered in net/ipv6/ip6mr.c in the Linux kernel before 4.11.

Published Aug 13, 2019CWE-20EPSS 0.84%

Overview

CVE-2017-18509 is a high-severity vulnerability. It was published on August 13, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.htmlRefgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=99253eb750fda6a644d5188fb26c43bad8d5a745GitHubgithub.com/torvalds/linux/commit/99253eb750fda6a644d5188fb26c43bad8d5a745Reflists.debian.org/debian-lts-announce/2019/08/msg00016.htmlReflists.debian.org/debian-lts-announce/2019/08/msg00017.htmlReflists.openwall.net/netdev/2017/12/04/40Refpulsesecurity.co.nz/advisories/linux-kernel-4.9-inetcsklistenstop-gpfRefsalsa.debian.org/kernel-team/linux/commit/baefcdc2f29923e7325ce4e1a72c3ff0a9800f32Refseclists.org/bugtraq/2019/Aug/26Refsupport.f5.com/csp/article/K41582535

How CyberStrike helps

Frequently asked questions

What is CVE-2017-18509?

CVE-2017-18509 is a high-severity vulnerability. It was published on August 13, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2017-18509?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2017-18509?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-18509?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-18509 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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