[Snyk] Security upgrade python from 3.6-slim to 3.7-slim

[snyk-bot]

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

• docker/Dockerfile.python-3.6

We recommend upgrading to python:3.7-slim, as this image has only 46 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
	786	Directory Traversal SNYK-DEBIAN11-DPKG-2847942	No Known Exploit
	514	CVE-2021-4160 SNYK-DEBIAN11-OPENSSL-2388380	No Known Exploit
	678	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN11-OPENSSL-2426309	No Known Exploit
	678	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN11-OPENSSL-2426309	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN11-OPENSSL-2807596	No Known Exploit

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[secure-code-warrior-for-github]

Micro-Learning Topic: OS command injection (Detected by phrase)

Matched on "OS Command Injection"

What is this? (2min video)

In many situations, applications will rely on OS provided functions, scripts, macros and utilities instead of reimplementing them in code. While functions would typically be accessed through a native interface library, the remaining three OS provided features will normally be invoked via the command line or launched as a process. If unsafe inputs are used to construct commands or arguments, it may allow arbitrary OS operations to be performed that can compromise the server.

Try this challenge in Secure Code Warrior

Micro-Learning Topic: Directory traversal (Detected by phrase)

Matched on "Directory Traversal"

What is this? (2min video)

Path traversal vulnerabilities occur when inputs that have not been sufficiently validated or sanitised are used to build directory or file paths. If an attacker can influence the path being accessed by the server, they may be able to gain unauthorised access to files or even execute arbitrary code on the server (when coupled with file upload functionality).

Try this challenge in Secure Code Warrior