Safety vulnerability to Server-side Request Forgery (SSRF) via img tags

[martin-thoma]

safety reports:

| package                    | installed | affected                 | ID       |
+============================+===========+==========================+==========+
| reportlab                  | 3.5.68    | >=0.0                    | 39642    |
+==============================================================================+
| All versions of package reportlab are vulnerable to Server-side Request      |
| Forgery (SSRF) via img tags. In order to reduce risk, use trustedSchemes &   |
| trustedHosts (see in Reportlab's documentation) Steps to reproduce by Karan  |
| Bamal: 1. Download and install the latest package of reportlab 2. Go to      |
| demos -> odyssey -> dodyssey 3. In the text file odyssey.txt that needs to   |
| be converted to pdf inject <img src="http://127.0.0.1:5000" valign="top"/>   |
| 4. Create a nc listener nc -lp 5000 5. Run python3 dodyssey.py 6. You will   |
| get a hit on your nc showing we have successfully proceded to send a server  |
| side request 7. dodyssey.py will show error since there is no img file on    |
| the url, but we are able to do SSRF. See CVE-2020-28463.                     |