CVE-2009-4128

NameCVE-2009-4128
DescriptionGNU GRand Unified Bootloader (GRUB) 2 1.97 only compares the submitted portion of a password with the actual password, which makes it easier for physically proximate attackers to conduct brute force attacks and bypass authentication by submitting a password whose length is 1.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severityhigh
Debian Bugs555195

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
grub (PTS)jessie0.97-70fixed
stretch0.97-72fixed
bullseye, buster0.97-75fixed
sid0.97-76fixed
grub2 (PTS)jessie (security), jessie2.02~beta2-22+deb8u1fixed
stretch2.02~beta3-5+deb9u2fixed
buster2.02+dfsg1-20fixed
bullseye, sid2.04-7fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
grubsource(unstable)(not affected)
grub2source(unstable)1.97+20091115-1555195
grub2sourcelenny(not affected)

Notes

[lenny] - grub2 <not-affected> (Password authentication not yet present)
- grub <not-affected> (only affects grub2)

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