CVE-2017-5551

Published: 6 February 2017

The simple_set_acl function in fs/posix_acl.c in the Linux kernel before 4.9.6 preserves the setgid bit during a setxattr call involving a tmpfs filesystem, which allows local users to gain group privileges by leveraging the existence of a setgid program with restrictions on execute permissions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-7097.

From the Ubuntu Security Team

It was discovered that the Linux kernel did not clear the setgid bit during a setxattr call on a tmpfs filesystem. A local attacker could use this to gain elevated group privileges.

Notes

Author	Note
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

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

4.4

Score breakdown

Status

Package	Release	Status
linux-linaro-shared Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-armadaxp Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Not vulnerable
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-quantal Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Not vulnerable
	trusty	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Not vulnerable
	yakkety	Not vulnerable
	zesty	Not vulnerable
linux-grouper Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-mako Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Not vulnerable
	yakkety	Not vulnerable
	zesty	Does not exist
linux-manta Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-flo Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	xenial	Not vulnerable
	yakkety	Not vulnerable
	zesty	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was not-affected)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Released (4.4.0-67.88~14.04.1)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-aws Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Not vulnerable (4.15.0-1001.1)
	artful	Does not exist
	precise	Does not exist
	trusty	Not vulnerable (4.4.0-1002.2)
	xenial	Released (4.4.0-1009.18)
	yakkety	Does not exist
	zesty	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Not vulnerable
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist
	xenial	Released (4.10.0-27.30~16.04.2)
	yakkety	Does not exist
	zesty	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Released (4.18.0-8.9~18.04.1)
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist
	xenial	Released (4.10.0-27.30~16.04.2)
	yakkety	Does not exist
	zesty	Does not exist
linux-gke Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	precise	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.4.0-1003.3)
	yakkety	Does not exist
	zesty	Does not exist
linux-azure Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Not vulnerable (4.15.0-1002.2)
	artful	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	xenial	Not vulnerable (4.11.0-1009.9)
	yakkety	Does not exist
	zesty	Does not exist
linux-gcp Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Not vulnerable (4.15.0-1001.1)
	artful	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.10.0-1004.4)
	yakkety	Does not exist
	zesty	Does not exist
linux-kvm Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Not vulnerable (4.15.0-1002.2)
	artful	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.4.0-1004.9)
	zesty	Does not exist
linux-euclid Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Does not exist
	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (was needed ESM criteria)
	zesty	Does not exist
linux-oem Launchpad, Ubuntu, Debian	upstream	Released (4.10~rc4)
	bionic	Not vulnerable (4.15.0-1002.3)
	artful	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.13.0-1008.9)
	zesty	Does not exist
linux-ti-omap4 Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.10~rc4)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux Launchpad, Ubuntu, Debian	artful	Not vulnerable (4.10.0-19.21)
	bionic	Not vulnerable (4.13.0-16.19)
	precise	Not vulnerable
	trusty	Not vulnerable (3.13.0-132.181)
	upstream	Released (4.10~rc4)
	xenial	Released (4.4.0-67.88)
	yakkety	Released (4.8.0-59.64)
	zesty	Not vulnerable (4.10.0-8.10)
	Patches: Introduced by 073931017b49d9458aa351605b43a7e34598caef Fixed by 497de07d89c1410d76a15bec2bb41f24a2a89f31
linux-linaro-omap Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.10~rc4)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-qcm-msm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.10~rc4)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Not vulnerable (4.10.0-1004.6)
	bionic	Not vulnerable (4.13.0-1005.5)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.10~rc4)
	xenial	Released (4.4.0-1048.55)
	yakkety	Released (4.8.0-1043.47)
	zesty	Not vulnerable (4.10.0-1001.3)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Not vulnerable (4.4.0-1055.59)
	bionic	Not vulnerable
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.10~rc4)
	xenial	Released (4.4.0-1051.55)
	yakkety	Released (4.4.0-1055.59)
	zesty	Released (4.4.0-1055.59)

Severity score breakdown

Parameter	Value
Base score	4.4
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

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