[USN-3791-1] Git vulnerability

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Ubuntu Security Notice USN-3791-1
October 12, 2018

git vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Git could be made to run programs as your login if it recursively
opened a malicious git repository.

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

Details:

It was discovered that git did not properly validate git submodule
urls or paths. A remote attacker could possibly use this to craft a
git repository that causes arbitrary code execution when recursive
operations are used.

Update instructions:

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

Ubuntu 18.04 LTS:
git 1:2.17.1-1ubuntu0.3

Ubuntu 16.04 LTS:
git 1:2.7.4-0ubuntu1.5

Ubuntu 14.04 LTS:
git 1:1.9.1-1ubuntu0.9

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

References:
https://usn.ubuntu.com/usn/usn-3791-1
CVE-2018-17456

Package Information:
https://launchpad.net/ubuntu/+source/git/1:2.17.1-1ubuntu0.3
https://launchpad.net/ubuntu/+source/git/1:2.7.4-0ubuntu1.5
https://launchpad.net/ubuntu/+source/git/1:1.9.1-1ubuntu0.9