Debian Security Advisory DSA-4735-1 Grub2


Debian security advisory DSA-4735-1 Grub2.

Several vulnerabilities have been discovered in the GRUB2 bootloader.

Debian security advisory DSA-4735-1 Grub2.

Package: grub2

  • CVE-2020-10713
  • CVE-2020-14308
  • CVE-2020-14309
  • CVE-2020-14310
  • CVE-2020-14311
  • CVE-2020-15706
  • CVE-2020-15707

Several vulnerabilities have been discovered in the GRUB2 bootloader.

A flaw in the grub.cfg parsing code was found allowing to break UEFI Secure Boot and load arbitrary code. Details can be found at

It was discovered that grub_malloc does not validate the allocation size allowing for arithmetic overflow and subsequently a heap-based buffer overflow.

An integer overflow in grub_squash_read_symlink may lead to a heap-based buffer overflow.

An integer overflow in read_section_from_string may lead to a heap-based buffer overflow.

An integer overflow in grub_ext2_read_link may lead to a heap-based buffer overflow.

script: Avoid a use-after-free when redefining a function during execution.

An integer overflow flaw was found in the initrd size handling.

Further detailed information can be found at

For the stable distribution Debian 10 "Buster", these problems have been fixed in version 2.02+dfsg1-20+deb10u1.

We recommend that you upgrade your grub2 packages.

For the detailed security status of grub2 please refer to its security tracker page.

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