CVE-2020-10713 vulnerabilities and exploits

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A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to load an untrusted or modified kernel, an attacker would first need to...

Gnu Grub2 Debian Debian Linux 10.0 Opensuse Leap 15.1 Opensuse Leap 15.2 Vmware Photon Os

3 Github repositories1 Article

GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This i...

In grub2 versions prior to 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size. This leads the function to return invalid memory allocations which can be further used to cause possible integrity, confidentiality and...

Gnu Grub2 Opensuse Leap 15.1 Opensuse Leap 15.2

There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.

Gnu Grub2 Redhat Enterprise Linux 7.0 Redhat Enterprise Linux 8.0 Redhat Enterprise Linux Eus 8.1 Redhat Enterprise Linux Eus 8.2 Redhat Enterprise Linux Server Tus 8.2 Redhat Enterprise Linux Server Aus 8.2 Opensuse Leap 15.1 Opensuse Leap 15.2 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 14.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 16.04

There's an issue with grub2 in all versions prior to 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buff...

Gnu Grub2 Opensuse Leap 15.1 Opensuse Leap 15.2

There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may lever...

Gnu Grub2 Redhat Enterprise Linux 7.0 Redhat Enterprise Linux 8.0 Redhat Enterprise Linux Eus 8.1 Redhat Enterprise Linux Eus 8.2 Redhat Enterprise Linux Server Tus 8.2 Redhat Enterprise Linux Server Aus 8.2 Opensuse Leap 15.1 Opensuse Leap 15.2 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 14.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 16.04

1 Github repository

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 tri...

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