CVE-2017-18509
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.84%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.84% probability · 56th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- linux/linux kernel · canonical/ubuntu linux · debian/debian linux
- Source
- cve@mitre.org
References
- http://packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.htmlThird Party Advisory, VDB Entry
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=99253eb750fda6a644d5188fb26c43bad8d5a745Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/99253eb750fda6a644d5188fb26c43bad8d5a745Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00016.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00017.htmlMailing List, Third Party Advisory
- https://lists.openwall.net/netdev/2017/12/04/40Mailing List, Third Party Advisory
- https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-inetcsklistenstop-gpfExploit, Third Party Advisory
- https://salsa.debian.org/kernel-team/linux/commit/baefcdc2f29923e7325ce4e1a72c3ff0a9800f32Third Party Advisory
- https://seclists.org/bugtraq/2019/Aug/26Mailing List, Third Party Advisory
- https://support.f5.com/csp/article/K41582535Third Party Advisory
- https://support.f5.com/csp/article/K41582535?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4145-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4497Third Party Advisory
- http://packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.htmlThird Party Advisory, VDB Entry
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=99253eb750fda6a644d5188fb26c43bad8d5a745Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/99253eb750fda6a644d5188fb26c43bad8d5a745Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00016.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00017.htmlMailing List, Third Party Advisory
- https://lists.openwall.net/netdev/2017/12/04/40Mailing List, Third Party Advisory
- https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-inetcsklistenstop-gpfExploit, Third Party Advisory
- https://salsa.debian.org/kernel-team/linux/commit/baefcdc2f29923e7325ce4e1a72c3ff0a9800f32Third Party Advisory
- https://seclists.org/bugtraq/2019/Aug/26Mailing List, Third Party Advisory
- https://support.f5.com/csp/article/K41582535Third Party Advisory
- https://support.f5.com/csp/article/K41582535?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4145-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4497Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.