USN-4692-1: tar vulnerabilities

Packages

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)

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

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

Learn more about how to get the fixes.

Ubuntu Release	Package Version
20.10 groovy	tar – 1.30+dfsg-7ubuntu0.20.10.1
20.04 focal	tar – 1.30+dfsg-7ubuntu0.20.04.1
18.04 bionic	tar – 1.29b-2ubuntu0.2
16.04 xenial	tar – 1.28-2.1ubuntu0.2
14.04 trusty	tar – 1.27.1-1ubuntu0.1+esm1
12.04 precise	tar – 1.26-4ubuntu1.2

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