CVE-2018-19854

Published: 4 December 2018

An issue was discovered in the Linux kernel before 4.19.3. crypto_report_one() and related functions in crypto/crypto_user.c (the crypto user configuration API) do not fully initialize structures that are copied to userspace, potentially leaking sensitive memory to user programs. NOTE: this is a CVE-2013-2547 regression but with easier exploitability because the attacker does not need a capability (however, the system must have the CONFIG_CRYPTO_USER kconfig option).

From the Ubuntu Security Team

It was discovered that the crypto subsystem of the Linux kernel leaked uninitialized memory to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory).

Priority

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-46.49)
	cosmic	Released (4.18.0-14.15)
	trusty	Not vulnerable (3.11.0-12.19)
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.2.0-16.19)
	Patches: Introduced by 4473710df1f8779c59b33737eeaa151596907761 Fixed by f43f39958beb206b53292801e216d9b8a660f087
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1033.35)
	cosmic	Released (4.18.0-1008.10)
	trusty	Not vulnerable (4.4.0-1002.2)
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.4.0-1001.10)
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1033.35~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-1011.11~18.04.1)
	cosmic	Released (4.18.0-1008.8)
	trusty	Released (4.15.0-1040.44~14.04.1)
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1040.44)
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-1011.11~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1040.44)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Ignored (was needs-triage ESM criteria)
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc3)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1028.29)
	cosmic	Released (4.18.0-1006.7)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1028.29~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-1006.7~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Ignored (end of standard support)
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc3)
	xenial	Ignored (end of life)
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-14.15~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-46.49~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-8.9~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-46.49~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1030.30)
	cosmic	Released (4.18.0-1007.7)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.4.0-1004.9)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Not vulnerable (4.4.0-13.29~14.04.1)
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc3)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc3)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1034.39)
	cosmic	Released (4.15.0-1034.39)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Ignored (end of standard support, was needs-triage)
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1009.11)
	cosmic	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1009.11~16.04.1)
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1032.34)
	cosmic	Released (4.18.0-1009.11)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.2.0-1013.19)
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.4.0-1012.12)

Severity score breakdown

Parameter	Value
Base score	4.7
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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