CVE-2020-25632: Use After Free
First published: Wed Sep 16 2020(Updated: )
A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/grub | <2.06 | 2.06 |
| CentOS Grub2-pc-modules | <2.06 | |
| Red Hat Enterprise Linux | =7.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux Server | =7.2 | |
| Red Hat Enterprise Linux Server | =7.3 | |
| Red Hat Enterprise Linux Server | =7.4 | |
| Red Hat Enterprise Linux Server | =7.6 | |
| Red Hat Enterprise Linux Server | =7.7 | |
| Red Hat Enterprise Linux Server | =8.2 | |
| Red Hat Enterprise Linux Server | =7.6 | |
| Red Hat Enterprise Linux Server | =7.7 | |
| Red Hat Enterprise Linux Server | =8.1 | |
| Red Hat Enterprise Linux Server | =7.4 | |
| Red Hat Enterprise Linux Server | =7.6 | |
| Red Hat Enterprise Linux Server | =7.7 | |
| Red Hat Enterprise Linux Server | =8.2 | |
| Red Hat Enterprise Linux Workstation | =7.0 | |
| Red Hat Fedora | =33 | |
| Red Hat Fedora | =34 | |
| NetApp ONTAP Select Deploy |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1879577
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
- https://security.gentoo.org/glsa/202104-05
- https://security.netapp.com/advisory/ntap-20220325-0001/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1934246
- https://access.redhat.com/errata/RHSA-2021:0698
- https://access.redhat.com/errata/RHSA-2021:0696
- https://access.redhat.com/errata/RHSA-2021:0697
- https://access.redhat.com/errata/RHSA-2021:0703
- https://access.redhat.com/errata/RHSA-2021:0704
- https://access.redhat.com/errata/RHSA-2021:0702
- https://access.redhat.com/errata/RHSA-2021:0699
- https://access.redhat.com/errata/RHSA-2021:0700
- https://access.redhat.com/errata/RHSA-2021:0701
- https://access.redhat.com/security/cve/cve-2020-25632
- https://access.redhat.com/errata/RHSA-2021:1734
- https://access.redhat.com/errata/RHSA-2021:2566
- https://access.redhat.com/errata/RHSA-2021:2790
- https://access.redhat.com/errata/RHSA-2021:3675
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
Frequently Asked Questions
What is the severity of CVE-2020-25632?
CVE-2020-25632 is considered a high severity vulnerability that could allow arbitrary code execution.
How do I fix CVE-2020-25632?
The recommended fix for CVE-2020-25632 is to upgrade grub2 to version 2.06 or later.
Which versions of grub2 are affected by CVE-2020-25632?
Versions of grub2 prior to 2.06 are affected by CVE-2020-25632.
What impact does CVE-2020-25632 have on system security?
CVE-2020-25632 can lead to a use-after-free condition, potentially allowing a bypass of security mechanisms.
Is CVE-2020-25632 specific to certain Linux distributions?
Yes, CVE-2020-25632 affects multiple Linux distributions, including Red Hat Enterprise Linux and Fedora, prior to the recommended versions.
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