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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

Low

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