CVE-2018-12233

Published: 12 June 2018

In the ea_get function in fs/jfs/xattr.c in the Linux kernel through 4.17.1, a memory corruption bug in JFS can be triggered by calling setxattr twice with two different extended attribute names on the same file. This vulnerability can be triggered by an unprivileged user with the ability to create files and execute programs. A kmalloc call is incorrect, leading to slab-out-of-bounds in jfs_xattr.

From the Ubuntu Security Team

Shankara Pailoor discovered that the JFS filesystem implementation in the Linux kernel contained a buffer overflow when handling extended attributes. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	artful	Ignored (reached end-of-life)
	bionic	Released (4.15.0-33.36)
	cosmic	Not vulnerable (4.17.0-7.8)
	precise	Ignored (was needed ESM criteria)
	trusty	Released (3.13.0-157.207)
	upstream	Released (4.18~rc2)
	xenial	Released (4.4.0-134.160)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by 92d34134193e5b129dc24f8d79cb9196626e8d7a
linux-aws Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1020.20)
	cosmic	Not vulnerable (4.15.0-1020.20)
	precise	Does not exist
	trusty	Released (4.4.0-1028.31)
	upstream	Released (4.18~rc2)
	xenial	Released (4.4.0-1066.76)
linux-azure Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1022.23)
	cosmic	Not vulnerable (4.18.0-1003.3)
	precise	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	upstream	Released (4.18~rc2)
	xenial	Released (4.15.0-1022.22~16.04.1)
linux-azure-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.18.0-1003.3~18.04.1)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Released (4.15.0-1022.23)
linux-euclid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Ignored (was needed ESM criteria)
linux-flo Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc2)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1018.19)
	cosmic	Not vulnerable (4.15.0-1018.19)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Released (4.15.0-1018.19~16.04.2)
linux-gke Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Ignored (was needs-triage now end-of-life)
linux-goldfish Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc2)
	xenial	Ignored (was needs-triage now end-of-life)
linux-grouper Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc2)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Released (4.15.0-33.36~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.18.0-11.12~18.04.1)
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Released (4.15.0-33.36~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1020.20)
	cosmic	Not vulnerable (4.15.0-1020.20)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Released (4.4.0-1032.38)
linux-lts-trusty Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Ignored (was needed ESM criteria)
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	artful	Does not exist
	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 (4.18~rc2)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	artful	Does not exist
	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 (4.18~rc2)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	artful	Does not exist
	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 (4.18~rc2)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Released (4.4.0-134.160~14.04.1)
	upstream	Released (4.18~rc2)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc2)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc2)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc2)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1017.20)
	cosmic	Not vulnerable (4.15.0-1017.20)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Ignored (was needed now end-of-life)
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Ignored (reached end-of-life)
	bionic	Released (4.15.0-1021.23)
	cosmic	Not vulnerable (4.15.0-1021.23)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Released (4.4.0-1095.103)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Ignored (reached end-of-life)
	bionic	Not vulnerable
	cosmic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc2)
	xenial	Released (4.4.0-1099.104)

Severity score breakdown

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

References

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