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CVE-2020-27779: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub’s memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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#vulnerability#linux#red_hat

Description Marco Benatto 2020-11-23 14:49:09 UTC

The grub2’s cutmem command does not honor secure boot locking. This allows an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub’s memory layout.

Comment 4 Marco Benatto 2021-03-02 18:39:51 UTC

Created grub2 tracking bugs for this issue:

Affects: fedora-all [bug 1934250]

Comment 10 errata-xmlrpc 2021-03-02 20:09:40 UTC

This issue has been addressed in the following products:

Red Hat Enterprise Linux 7.4 Advanced Update Support Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions Red Hat Enterprise Linux 7.4 Telco Extended Update Support

Via RHSA-2021:0702 https://access.redhat.com/errata/RHSA-2021:0702

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