Man-in-the-Middle (MitM)

nim is vulnerable to man-in-the-middle attack. nimble refresh fetches a list of Nimble packages over HTTPS by default. However, in case of an error, a non-TLS URL http://irclogs.nim-lang.org/packages.json is used and allows an attacker to perform MitM and deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.