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
| 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 |
| redhat/Kernel | <5.12 | 5.12 |
| Linux Kernel | <5.11.14 | |
| IBM Data Risk Manager | <=2.0.6 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.16-1 |
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)
Frequently Asked Questions
What is the severity of CVE-2021-33033?
CVE-2021-33033 is classified as a critical vulnerability due to its potential to allow local users to crash the system or escalate privileges.
How do I fix CVE-2021-33033?
To remediate CVE-2021-33033, upgrade to the patched kernel versions specified by your Linux distribution.
Which Linux kernel versions are affected by CVE-2021-33033?
CVE-2021-33033 affects Linux kernel versions up to 5.11.14, including certain Red Hat and Debian versions.
Can CVE-2021-33033 be exploited remotely?
CVE-2021-33033 is considered a local vulnerability, meaning it requires local access to the system to exploit.
What implications does CVE-2021-33033 have for system security?
CVE-2021-33033 poses a significant security risk as it allows local users to potentially escalate privileges or crash the system.
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