Arch Linux Security Advisory ASA-201901-1
========================================
Severity: Low
Date    : 2019-01-08
CVE-ID  : CVE-2018-20482
Package : tar
Type    : denial of service
Remote  : No
Link    : https://security.archlinux.org/AVG-841

Summary
======
The package tar before version 1.31-1 is vulnerable to denial of
service.

Resolution
=========
Upgrade to 1.31-1.

# pacman -Syu "tar>=1.31-1"

The problem has been fixed upstream in version 1.31.

Workaround
=========
None.

Description
==========
A denial of service issue has been found in GNU Tar versions up to and
including 1.30. When creating archives with the --sparse option, tar
would loop endlessly if a sparse file had been truncated while being
archived.

Impact
=====
An attacker might be able to cause a denial of service via an archive
created with the --sparse option.

References
=========
https://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html
https://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42c
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug
https://security.archlinux.org/CVE-2018-20482