CVE-2018-20482

Published: 26 December 2018

GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).

Priority

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package	Release	Status
tar Launchpad, Ubuntu, Debian	groovy	Not vulnerable (1.30+dfsg-6)
	bionic	Released (1.29b-2ubuntu0.2)
	cosmic	Ignored (end of life)
	disco	Not vulnerable (1.30+dfsg-5)
	eoan	Not vulnerable (1.30+dfsg-6)
	focal	Not vulnerable (1.30+dfsg-6)
	trusty	Released (1.27.1-1ubuntu0.1+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (1.30+dfsg-3.1)
	xenial	Released (1.28-2.1ubuntu0.2)
	Patches: upstream: http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42c

Severity score breakdown

Parameter	Value
Base score	4.7
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Bugs

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