=========================================================================Ubuntu Security Notice USN-4692-1
January 13, 2021
tar vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM
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)
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.
References:
https://ubuntu.com/security/notices/USN-4692-1
CVE-2018-20482, CVE-2019-9923
Package Information:
https://launchpad.net/ubuntu/+source/tar/1.30+dfsg-7ubuntu0.20.10.1
https://launchpad.net/ubuntu/+source/tar/1.30+dfsg-7ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/tar/1.29b-2ubuntu0.2
https://launchpad.net/ubuntu/+source/tar/1.28-2.1ubuntu0.2
