CVE-2011-1776

Published: 6 September 2011

The is_gpt_valid function in fs/partitions/efi.c in the Linux kernel before 2.6.39 does not check the size of an Extensible Firmware Interface (EFI) GUID Partition Table (GPT) entry, which allows physically proximate attackers to cause a denial of service (heap-based buffer overflow and OOPS) or obtain sensitive information from kernel heap memory by connecting a crafted GPT storage device, a different vulnerability than CVE-2011-1577.

From the Ubuntu Security Team

Timo Warns discovered that the EFI GUID partition table was not correctly parsed. A physically local attacker that could insert mountable devices could exploit this to crash the system or possibly gain root privileges.

Priority

Cvss 3 Severity Score

6.1

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	hardy	Released (2.6.24-29.94)
	lucid	Released (2.6.32-33.64)
	maverick	Released (2.6.35-30.60)
	natty	Released (2.6.38-10.44)
	oneiric	Not vulnerable (2.6.39-2.7)
	upstream	Released (2.6.39~rc7)
	Patches: upstream: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fa039d5f6b126fbd65eefa05db2f67e44df8f121
linux-ec2 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.32-317.32)
	maverick	Ignored (end of life)
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39~rc7)
linux-fsl-imx51 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.31-611.29)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39~rc7)
linux-lts-backport-maverick Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.35-30.60~lucid1)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39~rc7)
linux-lts-backport-natty Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.38-10.44~lucid1)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39~rc7)
linux-lts-backport-oneiric Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Not vulnerable
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39~rc7)
linux-mvl-dove Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.32-217.34)
	maverick	Released (2.6.32-417.34)
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (2.6.39~rc7)
linux-ti-omap4 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Does not exist
	maverick	Released (2.6.35-903.25)
	natty	Released (2.6.38-1209.16)
	oneiric	Not vulnerable (3.0.0-1204.9)
	upstream	Released (2.6.39~rc7)

Severity score breakdown

Parameter	Value
Base score	6.1
Attack vector	Physical
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

Bugs

https://launchpad.net/bugs/844365

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