[USN-4761-1] Git vulnerability

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-4761-1
March 09, 2021

git vulnerability
==========================================================================

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

Summary:

Git could be made to run programs if it received specially crafted network
traffic.

Software Description:
- git: fast, scalable, distributed revision control system

Details:

Matheus Tavares discovered that Git incorrectly handled delay-capable
clean/smudge filters when being used on case-insensitive filesystems. A
remote attacker could possibly use this issue to execute arbitrary code.

Update instructions:

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

Ubuntu 20.10:
  git                             1:2.27.0-1ubuntu1.1

Ubuntu 20.04 LTS:
  git                             1:2.25.1-1ubuntu3.1

Ubuntu 18.04 LTS:
  git                             1:2.17.1-1ubuntu0.8

Ubuntu 16.04 LTS:
  git                             1:2.7.4-0ubuntu1.10

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

References:
  https://ubuntu.com/security/notices/USN-4761-1
  CVE-2021-21300

Package Information:
  https://launchpad.net/ubuntu/+source/git/1:2.27.0-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/git/1:2.25.1-1ubuntu3.1
  https://launchpad.net/ubuntu/+source/git/1:2.17.1-1ubuntu0.8
  https://launchpad.net/ubuntu/+source/git/1:2.7.4-0ubuntu1.10

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