QID 354535

a flaw was found in grub 2, where a crafted 16-bit grayscale png image may lead to an out-of-bounds write.
This flaw allows an attacker to corrupt the data on the heap portion of the grub2s memory, leading to possible code execution and the circumvention of the secure boot mechanism. (
( CVE-2021-3695) a flaw was found in grub2 when handling a png image header.
When decoding the data contained in the huffman table at the png file header, an out-of-bounds write may happen on grubs heap. (
( CVE-2021-3696) a flaw was found in grub2 when handling jpeg images.
This flaw allows an attacker to craft a malicious jpeg image, which leads to an underflow on a grub2s internal pointer, leading to a heap-based out-of-bounds write.
Secure-boot mechanisms circumvention and arbitrary code execution may also be achievable. (
( CVE-2021-3697) a flaw was found in grub2 when handling ipv4 packets.
This flaw allows an attacker to craft a malicious packet, triggering an integer underflow in grub code.
Consequently, the memory allocation for handling the packet data may be smaller than the size needed.
This issue causes an out-of-bands write during packet handling, compromising data integrity, confidentiality issues, a denial of service, and remote code execution. (
( CVE-2022-28733) a flaw was found in grub2 when handling split http headers.
While processing a split http header, grub2 wrongly advances its control pointer to the internal buffer by one position, which can lead to an out-of-bounds write.
This flaw allows an attacker to leverage this issue by crafting a malicious set of http packages making grub2 corrupt its internal memory metadata structure.
( CVE-2022-28736)

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.