[SECURITY] Build downloads code over HTTP instead of HTTPS

[JLLeitschuh]

CWE-829: Inclusion of Functionality from Untrusted Control Sphere CWE-494: Download of Code Without Integrity Check

The build files indicate that this project is resolving dependencies over HTTP instead of HTTPS. Any of these artifacts could have been MITM to maliciously compromise them and infect the build artifacts that were produced. Additionally, if any of these JARs or other dependencies were compromised, any developers using these could continue to be infected past updating to fix this.

This vulnerability has a CVSS v3.0 Base Score of 8.1/10 https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

This isn't just theoretical

POC code has existed since 2014 to maliciously compromise a JAR file inflight. See:

• https://max.computer/blog/how-to-take-over-the-computer-of-any-java-or-clojure-or-scala-developer/
• https://github.com/mveytsman/dilettante

MITM Attacks Increasingly Common

See:

• https://serverfault.com/a/153065
• https://security.stackexchange.com/a/12050
• Comcast continues to inject its own code into websites you visit (over HTTP)

Source Locations

• https://github.com/pink-room/kotlin-multiplatform-template/blob/a5625f982990239f4ce5c17a8b629afc2145a196/build.gradle#L13
• https://github.com/pink-room/kotlin-multiplatform-template/blob/a5625f982990239f4ce5c17a8b629afc2145a196/build.gradle#L31-L36

More Information

Want to take over the Java ecosystem? All you need is a MITM!

[bffcorreia]

Thx for the report @JLLeitschuh! This is now fixed in the PR 7.