CVE-2021-33033: Use After Free
First published: Thu Mar 04 2021(Updated: )
A flaw use-after-free in the Linux kernel CIPSO network packet labeling protocol functionality was found in the way user open local network connection with the usage of the security labeling that is IP option number 134. A local user could use this flaw to crash the system or possibly escalate their privileges on the system.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:3.10.0-1160.36.2.rt56.1179.el7 | 0:3.10.0-1160.36.2.rt56.1179.el7 |
| redhat/kernel | <0:3.10.0-1160.36.2.el7 | 0:3.10.0-1160.36.2.el7 |
| redhat/kernel-rt | <0:4.18.0-348.rt7.130.el8 | 0:4.18.0-348.rt7.130.el8 |
| redhat/kernel | <0:4.18.0-348.el8 | 0:4.18.0-348.el8 |
| Linux Linux kernel | <5.11.14 | |
| redhat/Kernel | <5.12 | 5.12 |
| IBM DRM | <=2.0.6 | |
| debian/linux | 5.10.223-1 6.1.106-3 6.1.99-1 6.10.9-1 |
Remedy
The mitigation would be not allowing CIPSO labeling for the inbound network connections. For the most of the default configurations both for network routers and for the Linux servers itself it is disabled by default.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-33033 https://nvd.nist.gov/vuln/detail/CVE-2021-33033
- https://bugzilla.redhat.com/show_bug.cgi?id=1961300
- https://access.redhat.com/errata/RHSA-2021:2726
- https://access.redhat.com/errata/RHSA-2021:2725
- https://access.redhat.com/errata/RHSA-2021:4140
- https://access.redhat.com/errata/RHSA-2021:4356
- https://access.redhat.com/security/cve/CVE-2021-33033
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt
- https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
- https://launchpad.net/bugs/cve/CVE-2021-33033
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1961301
- https://access.redhat.com/security/cve/cve-2021-33033
- https://exchange.xforce.ibmcloud.com/vulnerabilities/203148
- https://www.ibm.com/support/pages/node/6497499 (Advisory)
- https://git.kernel.org/linus/ad5d07f4a9cd671233ae20983848874731102c08
- https://security-tracker.debian.org/tracker/CVE-2021-33033
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33033
- https://nvd.nist.gov/vuln/detail/CVE-2021-33033
- https://ubuntu.com/security/CVE-2021-33033
Parent vulnerabilities
(Appears in the following advisories)
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/severity
- agent/remedy
- agent/description
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-33033
- agent/weakness
- agent/references
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- collector/ibm-support
- source/IBM
- agent/event
- agent/tags
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- package-manager/redhat
- vendor/linux
- canonical/linux linux kernel
- vendor/ibm
- canonical/ibm drm
- version/ibm drm/2.0.6
- package-manager/debian