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Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication obtain sensitive information or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.

🗓️ 18 Aug 2020 00:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 3 Views

Grub2 underflows in backspace handling enable authentication bypass and denial of service.

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18 Aug 2020 00:00Current
7.1High risk
Vulners AI Score7.1
CVSS 26.9
CVSS 3.17.4
EPSS0.04702
SSVC
3