CVE-2017-17448

Published: 6 December 2017

net/netfilter/nfnetlink_cthelper.c in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations, which allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.

From the Ubuntu Security Team

It was discovered that the netfilter component of the Linux did not properly restrict access to the connection tracking helpers list. A local attacker could use this to bypass intended access restrictions.

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-10.11)
	upstream	Released (4.15~rc4)
	artful	Released (4.13.0-38.43)
	trusty	Released (3.13.0-144.193)
	xenial	Released (4.4.0-119.143)
	zesty	Ignored (end of life)
	Patches: Introduced by 12f7a505331e6b2754684b509f2ac8f0011ce644 Fixed by 4b380c42f7d00a395feede754f0bc2292eebe6e5
linux-linaro-omap Launchpad, Ubuntu, Debian	upstream	Released (4.15~rc4)
	bionic	Does not exist
	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
linux-ti-omap4 Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
linux-armadaxp Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Ignored (abandoned)
	zesty	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Not vulnerable
	zesty	Not vulnerable
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Does not exist
	zesty	Does not exist
linux-linaro-shared Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
linux-aws Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1001.1)
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Released (4.4.0-1016.16)
	xenial	Released (4.4.0-1054.63)
	zesty	Does not exist
linux-azure Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1002.2)
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	xenial	Released (4.13.0-1014.17)
	zesty	Does not exist
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (was needed ESM criteria)
	zesty	Does not exist
linux-gcp Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1001.1)
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.13.0-1012.16)
	zesty	Does not exist
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (end of standard support, was needed)
	zesty	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.13.0-38.43~16.04.1)
	zesty	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-8.9~18.04.1)
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.13.0-38.43~16.04.1)
	zesty	Does not exist
linux-kvm Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1002.2)
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.4.0-1020.25)
	zesty	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Ignored (end of life, was needs-triage)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
	zesty	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	upstream	Released (4.15~rc4)
	artful	Does not exist
	trusty	Released (4.4.0-119.143~14.04.1)
	xenial	Does not exist
	zesty	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-quantal Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.15~rc4)
	xenial	Ignored (abandoned)
	zesty	Does not exist
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.15.0-1002.3)
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Released (4.13.0-1022.24)
	zesty	Does not exist
linux-qcm-msm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Does not exist
	zesty	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Released (4.13.0-1016.17)
	bionic	Not vulnerable (4.15.0-1006.7)
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Released (4.4.0-1086.94)
	zesty	Ignored (end of life)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Released (4.4.0-1088.93)
	bionic	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.15~rc4)
	xenial	Released (4.4.0-1088.93)
	zesty	Ignored (end of life)

Severity score breakdown

Parameter	Value
Base score	7.8
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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