Ubuntu 20.10 USN-4692-1 Critical: Tar Denial Of Service Issues

ubuntu

January 13, 2021

Several security issues were fixed in tar.

Summary

Several security issues were fixed in tar.

Software Description:

- tar: GNU version of the tar archiving utility

Details:

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. (CVE-2018-20482)

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. (CVE-2019-9923)

Topics Covered

security advisory denial of service update critical security fix ubuntu tar

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  tar                             1.30+dfsg-7ubuntu0.20.10.1

Ubuntu 20.04 LTS:
  tar                             1.30+dfsg-7ubuntu0.20.04.1

Ubuntu 18.04 LTS:
  tar                             1.29b-2ubuntu0.2

Ubuntu 16.04 LTS:
  tar                             1.28-2.1ubuntu0.2

Ubuntu 14.04 ESM:
  tar                             1.27.1-1ubuntu0.1+esm1

Ubuntu 12.04 ESM:
  tar                             1.26-4ubuntu1.2

In general, a standard system update will make all the necessary changes.