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CVE-2018-20482

Status Candidate

Overview

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).

Related Files

Ubuntu Security Notice USN-4692-1
Posted Jan 13, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4692-1 - Chris Siebenmann discovered that tar incorrectly handled extracting files resized during extraction when invoked with the --sparse flag. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 12.04 ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Daniel Axtens discovered that tar incorrectly handled certain malformed tar files. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could use this issue to cause tar to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2018-20482, CVE-2019-9923
SHA-256 | 9bed467c26667336b932ddeba1541600754872bc0120a0b322fee2ac338b5d12
Gentoo Linux Security Advisory 201903-05
Posted Mar 11, 2019
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201903-5 - A vulnerability in Tar could led to a Denial of Service condition. Versions less than 1.30-r1 are affected.

tags | advisory, denial of service
systems | linux, gentoo
advisories | CVE-2018-20482
SHA-256 | 13c5f7e57c5de3c581572b44785ed1addaa4de9fcc7744b3622491bb61d0105f
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