Insufficient input validation in efibootguard

efibootguard is a simple UEFI boot loader with support for safely switching between current and updated partition sets. Insufficient or missing validation and sanitization of input from untrustworthy bootloader environment files can cause crashes and probably also code injections into `bg_setenv`) or programs using `libebgenv`. This is triggered when the affected components try to modify a manipulated environment, in particular its user variables. Furthermore, `bg_printenv` may crash over invalid read accesses or report invalid results. Not affected by this issue is EFI Boot Guard's bootloader EFI binary. EFI Boot Guard release v0.15 contains required patches to sanitize and validate the bootloader environment prior to processing it in userspace. Its library and tools should be updated, so should programs statically linked against it. An update of the bootloader EFI executable is not required. The only way to prevent the issue with an unpatched EFI Boot Guard version is to avoid accesses to user variables, specifically modifications to them.

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

输入验证不恰当

Siemens EFI Boot Guard 输入验证错误漏洞

Siemens EFI Boot Guard是德国西门子（Siemens）公司的一个简单的 UEFI 引导加载程序。 Siemens EFI Boot Guard 0.15之前版本存在输入验证错误漏洞，该漏洞源于输入验证和清理不充分，从而导致系统崩溃。

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