All versions of package reportlab at time of writing 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

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-28463
• https://bugzilla.redhat.com/show_bug.cgi?id=1930417
• https://hg.reportlab.com/hg-public/reportlab/rev/7f2231703dc7
• https://snyk.io/vuln/SNYK-PYTHON-REPORTLAB-1022145
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HMUJA5GZTPQ5WRYUCCK2GEZM4W43N7HH/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YZQSFCID67K6BTC655EQY6MNOF35QI44/
• https://hg.reportlab.com/hg-public/reportlab/file/f094d273903a/CHANGES.md#l71
• https://www.reportlab.com/docs/reportlab-userguide.pdf
• https://lists.debian.org/debian-lts-announce/2023/09/msg00037.html