Grub2: read: integer overflow may lead to out-of-bounds write

The read command is used to read the keyboard input from the user, while reads it keeps the input length in a 32-bit integer value which is further used to reallocate the line buffer to accept the next character. During this process, with a line big enough it's possible to make this variable to overflow leading to a out-of-bounds write in the heap based buffer. This flaw may be leveraged to corrupt grub's internal critical data and secure boot bypass is not discarded as consequence.

CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

跨界内存写

GNU GRUB 缓冲区错误漏洞

GNU GRUB是GNU社区的一款Linux系统引导程序。 GNU GRUB存在缓冲区错误漏洞，该漏洞源于read模块包含一个整数溢出问题，导致越界写入。

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