CVE-2019-3874
First published: Thu Mar 07 2019(Updated: )
It was found that the cgroup limitation of system resources used by Kubernetes can be bypassed. A guest pod can be used to consume a large amount of system memory. A suggested upstream patch set: <a href="https://lore.kernel.org/netdev/20190401113110.GA20717@hmswarspite.think-freely.org/T/#u">https://lore.kernel.org/netdev/20190401113110.GA20717@hmswarspite.think-freely.org/T/#u</a>
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-147.rt24.93.el8 | 0:4.18.0-147.rt24.93.el8 |
| redhat/kernel | <0:4.18.0-147.el8 | 0:4.18.0-147.el8 |
| Linux Kernel | >=3.10.1<=3.10.108 | |
| Linux Kernel | >=4.18.1<=4.18.20 | |
| Debian | =8.0 | |
| Red Hat Enterprise Linux | =7.0 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 | |
| Ubuntu | =18.10 | |
| Ubuntu | =19.04 | |
| NetApp Active IQ Unified Manager | >=9.5 | |
| NetApp SolidFire & HCI Management Node | ||
| NetApp SnapProtect | ||
| NetApp SolidFire & HCI Storage Node | ||
| All of | ||
| NetApp CN1610 | ||
| NetApp CN1610 Firmware | ||
| NetApp CN1610 | ||
| NetApp CN1610 Firmware | ||
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
Remedy
SELinux prevents a bind of the SCTP socket by a non-root user. To mitigate this issue if not using SELinux, or if a Security Context Constraint allows running pods as the root user the 'sctp' module should be blacklisted. Please this this Knowledge Base article for more information on how to blacklist a kernel module. https://access.redhat.com/solutions/41278
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2019-3874 https://nvd.nist.gov/vuln/detail/CVE-2019-3874 https://discuss.kubernetes.io/t/kubernetes-security-announcement-linux-kernel-memory-cgroups-escape-via-sctp-cve-2019-3874/5594 https://lore.kernel.org/netdev/20190401113110.GA20717@hmswarspite.think-freely.org/T/#u
- https://bugzilla.redhat.com/show_bug.cgi?id=1686373
- https://access.redhat.com/errata/RHSA-2019:3309
- https://access.redhat.com/errata/RHSA-2019:3517
- https://access.redhat.com/security/cve/cve-2019-3874
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3874
- https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
- https://security.netapp.com/advisory/ntap-20190411-0003/
- https://usn.ubuntu.com/3979-1/
- https://usn.ubuntu.com/3980-1/
- https://usn.ubuntu.com/3980-2/
- https://usn.ubuntu.com/3981-1/
- https://usn.ubuntu.com/3981-2/
- https://usn.ubuntu.com/3982-1/
- https://usn.ubuntu.com/3982-2/
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://launchpad.net/bugs/cve/CVE-2019-3874
- https://lore.kernel.org/netdev/20190401113110.GA20717@hmswarspite.think-freely.org/T/#u
- https://github.com/openshift/openshift-ansible/blob/006fb14e9a28df9bd1a58ac376bbdf3eba50fa51/roles/openshift_node/tasks/main.yml#L3
- https://access.redhat.com/solutions/41278
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1690646
- https://discuss.kubernetes.io/t/kubernetes-security-announcement-linux-kernel-memory-cgroups-escape-via-sctp-cve-2019-3874/5594
- https://security-tracker.debian.org/tracker/CVE-2019-3874
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3874
- https://nvd.nist.gov/vuln/detail/CVE-2019-3874
- https://ubuntu.com/security/CVE-2019-3874
Frequently Asked Questions
What is the severity of CVE-2019-3874?
CVE-2019-3874 has been classified as a medium severity vulnerability due to its potential to allow resource consumption beyond intended limits.
How do I fix CVE-2019-3874?
To mitigate CVE-2019-3874, update your kernel to version 4.18.0-147.rt24.93.el8 or later.
What systems are affected by CVE-2019-3874?
CVE-2019-3874 affects certain versions of the Linux kernel and Kubernetes running on various distributions like Red Hat, Ubuntu, and Debian.
How does CVE-2019-3874 exploit Kubernetes?
CVE-2019-3874 allows a guest pod to bypass cgroup restrictions, leading to uncontrolled memory usage in the host system.
What are the recommended actions to secure against CVE-2019-3874?
It is recommended to apply the latest kernel patches and updates from your distribution to remediate CVE-2019-3874.
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