CVE-2018-13099

Published: 3 July 2018

An issue was discovered in fs/f2fs/inline.c in the Linux kernel through 4.4. A denial of service (out-of-bounds memory access and BUG) can occur for a modified f2fs filesystem image in which an inline inode contains an invalid reserved blkaddr.

From the Ubuntu Security Team

Wen Xu discovered that the f2fs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash).

Notes

Author	Note
sbeattie	possible reproducer in kernel bugzilla fix subject "f2fs: fix to do sanity check with reserved blkaddr of inline inode"
tyhicks	The affected user base for this issue is likely small since f2fs is not the default filesystem and it is not widely used in Ubuntu

Author

Note

sbeattie

possible reproducer in kernel bugzilla
fix subject "f2fs: fix to do sanity check with reserved
blkaddr of inline inode"

tyhicks

The affected user base for this issue is likely small since f2fs is
not the default filesystem and it is not widely used in Ubuntu

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux-aws Launchpad, Ubuntu, Debian	upstream	Released (4.19~rc1)
	trusty	Released (4.4.0-1040.43)
	xenial	Released (4.4.0-1079.89)
	artful	Does not exist
	bionic	Released (4.15.0-1047.49)
	cosmic	Not vulnerable (4.18.0-1002.3)
	disco	Not vulnerable (4.18.0-1002.3)
linux-azure Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.18.0-1011.11~18.04.1)
	cosmic	Not vulnerable (4.18.0-1003.3)
	disco	Not vulnerable (4.18.0-1003.3)
	trusty	Ignored (was needed ESM criteria)
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1055.60)
linux-aws-hwe Launchpad, Ubuntu, Debian	upstream	Released (4.19~rc1)
	trusty	Does not exist
	xenial	Released (4.15.0-1047.49~16.04.1)
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	upstream	Released (4.19~rc1)
	trusty	Does not exist
	xenial	Released (4.15.0-1021.23~16.04.1)
	bionic	Released (4.15.0-1021.23)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-1004.8)
linux Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Released (4.15.0-58.64)
	cosmic	Not vulnerable (4.18.0-9.10)
	disco	Not vulnerable (4.18.0-10.11)
	trusty	Not vulnerable (3.11.0-12.19)
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-145.171)
	Patches: Introduced by bfad7c2d40332be6a1d7a89660bceb0f6ea1d73a Fixed by 4dbe38dc386910c668c75ae616b99b823b59f3eb
linux-azure-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.18.0-1011.11~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1055.60)
linux-euclid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Ignored (was needed ESM criteria)
linux-flo Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1040.42)
	cosmic	Not vulnerable (4.18.0-1002.3)
	disco	Not vulnerable (4.18.0-1002.3)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1040.42~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1040.42)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Ignored (end of standard support)
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1040.42)
	disco	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-1011.11~18.04.1)
	disco	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Ignored (end of life)
linux-grouper Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.18.0-13.14~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-58.64~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (5.0.0-15.16~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-58.64~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1042.42)
	cosmic	Not vulnerable (4.18.0-1003.3)
	disco	Not vulnerable (4.18.0-1003.3)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-1043.49)
linux-lts-trusty Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Released (4.4.0-144.170~14.04.1)
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1050.57)
	cosmic	Ignored (end of life)
	disco	Released (4.15.0-1050.57)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Ignored (end of standard support, was needed)
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Released (4.15.0-1043.46)
	cosmic	Not vulnerable (4.18.0-1005.7)
	disco	Not vulnerable (4.18.0-1005.7)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-1106.114)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Released (4.15.0-1060.66)
	cosmic	Does not exist
	disco	Not vulnerable (5.0.0-1010.10)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-1110.115)

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

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