CVE-2018-17972

Published: 3 October 2018

An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel through 4.18.11. It does not ensure that only root may inspect the kernel stack of an arbitrary task, allowing a local attacker to exploit racy stack unwinding and leak kernel task stack contents.

From the Ubuntu Security Team

Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information.

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-44.47)
	cosmic	Released (4.18.0-12.13)
	precise	Ignored (was needed ESM criteria)
	trusty	Released (3.13.0-165.215)
	upstream	Released (4.19~rc7)
	xenial	Released (4.4.0-139.165)
	Patches: Introduced by 2ec220e27f5040aec1e88901c1b6ea3d135787ad Fixed by f8a00cef17206ecd1b30d3d9f99e10d9fa707aa7
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1032.34)
	cosmic	Released (4.18.0-1006.7)
	precise	Does not exist
	trusty	Released (4.4.0-1034.37)
	upstream	Released (4.19~rc7)
	xenial	Released (4.4.0-1072.82)
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1032.34~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1037.39)
	cosmic	Released (4.18.0-1006.6)
	precise	Does not exist
	trusty	Released (4.15.0-1037.39~14.04.2)
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1037.39~16.04.1)
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1037.39)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1037.39~16.04.1)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Ignored (was needed ESM criteria)
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1027.28)
	cosmic	Released (4.18.0-1004.5)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1027.28~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-1004.5~18.04.1)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Ignored (end-of-life)
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Ignored (end-of-life)
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-13.14~18.04.1)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-45.48~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-8.9~18.04.1)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-45.48~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1029.29)
	cosmic	Released (4.18.0-1005.5)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.4.0-1037.43)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Released (3.13.0-165.215~precise1)
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Released (4.4.0-139.165~14.04.1)
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc7)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1033.38)
	cosmic	Released (4.15.0-1033.38)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Ignored (was needs-triage now end-of-life)
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1008.10)
	cosmic	Not vulnerable
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.15.0-1008.10~16.04.1)
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1031.33)
	cosmic	Released (4.18.0-1007.9)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.4.0-1100.108)
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc7)
	xenial	Released (4.4.0-1104.109)

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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