[Snyk] Security upgrade ubuntu from xenial to xenial-20210416

[ekmixon]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• devenv/docker/blocks/collectd/Dockerfile

We recommend upgrading to ubuntu:xenial-20210416, as this image has only 81 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	536	Improper Check for Dropped Privileges SNYK-UBUNTU1604-BASH-542609	Mature
	514	Arbitrary Code Injection SNYK-UBUNTU1604-GNUPG-2940683	No Known Exploit
	614	Allocation of Resources Without Limits or Throttling SNYK-UBUNTU1604-SYSTEMD-1320131	No Known Exploit
	514	Off-by-one Error SNYK-UBUNTU1604-SYSTEMD-3098849	No Known Exploit
	514	Out-of-bounds Read SNYK-UBUNTU1604-TAR-3261141	No Known Exploit

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🦉 Allocation of Resources Without Limits or Throttling

[secure-code-warrior-for-github]

Micro-Learning Topic: Code injection (Detected by phrase)

Matched on "Code Injection"

What is this? (2min video)

Code injection happens when an application insecurely accepts input that is subsequently used in a dynamic code evaluation call. If insufficient validation or sanitisation is performed on the input, specially crafted inputs may be able to alter the syntax of the evaluated code and thus alter execution. In a worst case scenario, an attacker could run arbitrary code in the server context and thus perform almost any action on the application server.

Try a challenge in Secure Code Warrior

Helpful references

• OWASP Command Injection - OWASP community page with comprehensive information about Code Injection, and links to various OWASP resources to help detect or prevent it.
• SEI CERT Oracle Coding Standard for Java - Prevent Code Injection - Carnegie Mellon University Software Engineering Institute guidance on preventing code injection vulnerabilities in Java.