CVE-2016-1237

Published: 29 June 2016

nfsd in the Linux kernel through 4.6.3 allows local users to bypass intended file-permission restrictions by setting a POSIX ACL, related to nfs2acl.c, nfs3acl.c, and nfs4acl.c.

From the Ubuntu Security Team

A missing permission check when settings ACLs was discovered in nfsd. A local user could exploit this flaw to gain access to any file by setting an ACL.

Notes

Author	Note
mdeslaur	also needs 485e71e8fb6356c08c7fc6bcce4bf02c9a9a663f
jdstrand	android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.10 and earlier preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support

Author

Note

mdeslaur

also needs 485e71e8fb6356c08c7fc6bcce4bf02c9a9a663f

jdstrand

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	upstream	Released (4.7~rc5)
	precise	Not vulnerable
	trusty	Not vulnerable
	wily	Ignored (end of life)
	xenial	Released (4.4.0-36.55)
	yakkety	Not vulnerable (4.8.0-11.12)
	Patches: Introduced by 4ac7249ea5a0ceef9f8269f63f33cc873c3fac61 Fixed by 485e71e8fb6356c08c7fc6bcce4bf02c9a9a663f Introduced by 4ac7249ea5a0ceef9f8269f63f33cc873c3fac61 Fixed by 999653786df6954a31044528ac3f7a5dadca08f4
linux-armadaxp Launchpad, Ubuntu, Debian	trusty	Does not exist
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	precise	Not vulnerable
	This package is not directly supported by the Ubuntu Security Team
linux-aws Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Not vulnerable (4.4.0-1002.2)
	upstream	Released (4.7~rc5)
	xenial	Not vulnerable (4.4.0-1001.10)
	yakkety	Does not exist
linux-flo Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.7~rc5)
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
linux-gke Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	xenial	Not vulnerable (4.4.0-1003.3)
	yakkety	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.7~rc5)
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
linux-grouper Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
	yakkety	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
	yakkety	Does not exist
linux-linaro-omap Launchpad, Ubuntu, Debian	upstream	Released (4.7~rc5)
	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-linaro-shared Launchpad, Ubuntu, Debian	upstream	Released (4.7~rc5)
	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	upstream	Released (4.7~rc5)
	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-quantal Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Released (3.19.0-66.74~14.04.1)
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Released (4.4.0-36.55~14.04.1)
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-mako Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.7~rc5)
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
linux-manta Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.7~rc5)
	wily	Not vulnerable
	xenial	Does not exist
	yakkety	Does not exist
linux-qcm-msm Launchpad, Ubuntu, Debian	upstream	Released (4.7~rc5)
	xenial	Does not exist
	yakkety	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	wily	Ignored (end of life)
	xenial	Released (4.4.0-1021.27)
	yakkety	Not vulnerable (4.8.0-1012.14)
linux-snapdragon Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.7~rc5)
	wily	Does not exist
	xenial	Released (4.4.0-1024.27)
	yakkety	Not vulnerable (4.4.0-1029.32)
linux-ti-omap4 Launchpad, Ubuntu, Debian	upstream	Released (4.7~rc5)
	precise	Not vulnerable
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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