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CVE-2019-9923

Status Candidate

Overview

pax_decode_header in sparse.c in GNU Tar before 1.32 had a NULL pointer dereference when parsing certain archives that have malformed extended headers.

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
MD5 | 344cbf5822690466c47037ca26772ba8
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