CVE-2020-15707 GRUB2 contained integer overflows when handling the initrd command, leading to a heap-based buffer overflow.
Integer overflows in GRUB2 allow heap-based buffer overflows, enabling arbitrary code execution and UEFI Secure Boot bypass.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-15707?
CVE-2020-15707 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 29 Jul 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.
Which versions are affected by CVE-2020-15707?
It affects 15 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Gnu Grub2, Microsoft Windows 10, Microsoft Windows 8.1, Microsoft Windows Rt 8.1 and 9 more.
How do I fix CVE-2020-15707?
Apply the vendor's patch.
Is CVE-2020-15707 being exploited?
There is no known exploitation of CVE-2020-15707 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as ALPINE-CVE-2020-15707, DEBIAN-CVE-2020-15707, GHSA-mf72-cf87-p3p2, UBUNTU-CVE-2020-15707.