Debian Security Advisory
DSA-4867-1 grub2 -- security update
- Date Reported:
- 02 Mar 2021
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2020-14372, CVE-2020-25632, CVE-2020-25647, CVE-2020-27749, CVE-2020-27779, CVE-2021-20225, CVE-2021-20233.
- More information:
Several vulnerabilities have been discovered in the GRUB2 bootloader.
It was discovered that the acpi command allows a privileged user to load crafted ACPI tables when Secure Boot is enabled.
A use-after-free vulnerability was found in the rmmod command.
An out-of-bound write vulnerability was found in the grub_usb_device_initialize() function, which is called to handle USB device initialization.
A stack buffer overflow flaw was found in grub_parser_split_cmdline.
It was discovered that the cutmem command allows a privileged user to remove memory regions when Secure Boot is enabled.
A heap out-of-bounds write vulnerability was found in the short form option parser.
A heap out-of-bound write flaw was found caused by mis-calculation of space required for quoting in the menu rendering.
Further detailed information can be found at https://www.debian.org/security/2021-GRUB-UEFI-SecureBoot
For the stable distribution (buster), these problems have been fixed in version 2.02+dfsg1-20+deb10u4.
We recommend that you upgrade your grub2 packages.
For the detailed security status of grub2 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/grub2