CVE-2017-18017
CRITICALCVSS 9.8/10EPSS 52.19%
Last modified
CVE-2017-18017 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.. EPSS estimates a 52.19% chance of exploitation in the next 30 days.
Description
The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 3.2, < 3.2.99 | — |
| Linux | Linux Kernel | >= 3.3, < 3.10.108 | — |
| Linux | Linux Kernel | >= 3.11, < 3.16.54 | — |
| Linux | Linux Kernel | >= 3.17, < 3.18.60 | — |
| Linux | Linux Kernel | >= 3.19, < 4.1.43 | — |
| Linux | Linux Kernel | >= 4.2, < 4.4.76 | — |
| Linux | Linux Kernel | >= 4.5, < 4.9.36 | — |
| Linux | Linux Kernel | >= 4.10, < 4.11 | — |
| Debian | Debian Linux | 7.0 | — |
| Debian | Debian Linux | 8.0 | — |
| Arista | Eos | 4.20.1fx-virtual-router | — |
| F5 | Arx | >= 6.2.0, <= 6.4.0 | — |
| Suse | Caas Platform | All versions | — |
| Suse | Linux Enterprise Debuginfo | 11 | Sp3 |
| Suse | Linux Enterprise Module For Public Cloud | 12 | — |
| Suse | Linux Enterprise Point Of Sale | 11 | Sp3 |
| Suse | Openstack Cloud | 6 | — |
| Opensuse | Leap | 42.3 | — |
| Suse | Linux Enterprise Desktop | 12 | Sp2 |
| Suse | Linux Enterprise High Availability | 12 | Sp2 |
| Suse | Linux Enterprise High Availability Extension | 11 | Sp4 |
| Suse | Linux Enterprise Live Patching | 12 | — |
| Suse | Linux Enterprise Real Time Extension | 11 | Sp4 |
| Suse | Linux Enterprise Real Time Extension | 12 | Sp2 |
| Suse | Linux Enterprise Server | 11 | Sp3 |
| Suse | Linux Enterprise Server | 12 | — |
| Suse | Linux Enterprise Software Development Kit | 11 | Sp4 |
| Suse | Linux Enterprise Software Development Kit | 12 | Sp2 |
| Suse | Linux Enterprise Workstation Extension | 12 | Sp2 |
| Openstack | Cloud Magnum Orchestration | 7 | — |
| Canonical | Ubuntu Linux | 12.04 | — |
| Canonical | Ubuntu Linux | 14.04 | — |
| Redhat | Mrg Realtime | 2.0 | — |
| Redhat | Enterprise Linux Desktop | 6.0 | — |
| Redhat | Enterprise Linux Desktop | 7.0 | — |
| Redhat | Enterprise Linux Eus | 7.3 | — |
| Redhat | Enterprise Linux Eus | 7.4 | — |
| Redhat | Enterprise Linux Eus | 7.6 | — |
| Redhat | Enterprise Linux Eus | 7.7 | — |
| Redhat | Enterprise Linux For Real Time | 7 | — |
| Redhat | Enterprise Linux For Real Time For Nfv | 7 | — |
| Redhat | Enterprise Linux Server | 6.0 | — |
| Redhat | Enterprise Linux Server | 7.0 | — |
| Redhat | Enterprise Linux Server Aus | 7.3 | — |
| Redhat | Enterprise Linux Server Aus | 7.4 | — |
| Redhat | Enterprise Linux Server Aus | 7.6 | — |
| Redhat | Enterprise Linux Server Aus | 7.7 | — |
| Redhat | Enterprise Linux Server Tus | 7.3 | — |
| Redhat | Enterprise Linux Server Tus | 7.4 | — |
| Redhat | Enterprise Linux Server Tus | 7.6 | — |
Showing 50 of 53 affected configurations. See NVD for the full list.
References
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00008.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00013.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00015.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00038.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00047.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00030.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00067.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00070.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00072.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-04/msg00014.htmlMailing List, Third Party Advisory
- http://patchwork.ozlabs.org/patch/746618/Patch, Third Party Advisory
- http://www.securityfocus.com/bid/102367Broken Link, Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-3583-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-3583-2Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:0676Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1062Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1130Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1170Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1319Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1737Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1739765Issue Tracking, Third Party Advisory
- https://github.com/torvalds/linux/commit/2638fd0f92d4397884fd991d8f4925cb3f081901Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/05/msg00000.htmlMailing List, Third Party Advisory
- https://lkml.org/lkml/2017/4/2/13Third Party Advisory
- https://support.f5.com/csp/article/K18352029Third Party Advisory
- https://usn.ubuntu.com/3583-1/Third Party Advisory
- https://usn.ubuntu.com/3583-2/Third Party Advisory
- https://www.arista.com/en/support/advisories-notices/security-advisories/4577-security-advisory-34Mitigation, Third Party Advisory
- https://www.debian.org/security/2018/dsa-4187Third Party Advisory
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.36Release Notes, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00008.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00013.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00015.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00038.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00047.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00030.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00067.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00070.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00072.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-04/msg00014.htmlMailing List, Third Party Advisory
- http://patchwork.ozlabs.org/patch/746618/Patch, Third Party Advisory
- http://www.securityfocus.com/bid/102367Broken Link, Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-3583-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-3583-2Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:0676Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1062Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1130Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1170Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1319Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1737Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1739765Issue Tracking, Third Party Advisory
- https://github.com/torvalds/linux/commit/2638fd0f92d4397884fd991d8f4925cb3f081901Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/05/msg00000.htmlMailing List, Third Party Advisory
- https://lkml.org/lkml/2017/4/2/13Third Party Advisory
- https://support.f5.com/csp/article/K18352029Third Party Advisory
- https://usn.ubuntu.com/3583-1/Third Party Advisory
- https://usn.ubuntu.com/3583-2/Third Party Advisory
- https://www.arista.com/en/support/advisories-notices/security-advisories/4577-security-advisory-34Mitigation, Third Party Advisory
- https://www.debian.org/security/2018/dsa-4187Third Party Advisory
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.36Release Notes, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2017-18017?
The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.
How severe is CVE-2017-18017?
CVE-2017-18017 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 52.19% probability of exploitation in the next 30 days.
How do I fix CVE-2017-18017?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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