𝕽𝖆𝖉𝖎𝖈𝖆𝖑 𝕽𝖊𝖇𝖊𝖑

“𝖘𝖊𝖛𝖊𝖓𝖙𝖞-𝖙𝖜𝖔 𝖛𝖎𝖗𝖌𝖎𝖓𝖘, 𝖈𝖆𝖓 𝖓𝖊𝖛𝖊𝖗 𝖘𝖙𝖔𝖕 𝖆 𝖜𝖆𝖗, 𝖇𝖚𝖙 𝖆 𝖍𝖚𝖓𝖉𝖗𝖊𝖉-𝖙𝖍𝖔𝖚𝖘𝖆𝖓𝖉 𝖍𝖔𝖔𝖐𝖊𝖗𝖘, 𝖈𝖔𝖚𝖑𝖉 𝖇𝖊𝖆𝖙 𝖙𝖍𝖊 𝖒𝖆𝖗𝖎𝖓𝖊 𝖈𝖔𝖗𝖊” - 𝖓𝖔𝖋𝖝

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Joined 1 year ago
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Cake day: June 6th, 2025

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  • Short article, here it is to save a click:

    The CMU CERT Coordination Center has put out an advisory that many exploitable versions of the shim binary, used to boot Linux on systems with UEFI secure boot enabled, were never added to the revocation list.

    An attacker with administrative privileges or the ability to modify the boot process could use one of the vulnerable shim bootloaders to bypass Secure Boot protections and execute arbitrary code before the operating system loads. Code executed during this early boot phase may achieve persistent compromise of the platform, including the ability to load unsigned or malicious kernel components that can survive system reboots and, in some cases, operating system reinstallation.

    The advisory contains a list of vulnerable shims.