An exploitable vulnerability exists in the YAML parsing functionality in config.py in Confire 0.2.0. Due to the user-specific configuration being loaded from "~/.confire.yaml" using the yaml.load function, a YAML parser can execute arbitrary Python commands resulting in command execution. An attacker can insert Python into loaded YAML to trigger this vulnerability.

References

• https://nvd.nist.gov/vuln/detail/CVE-2017-16763
• bbengfort/confire#24
• bbengfort/confire@8cc86a5
• GHSA-m85c-9mf8-m2m6
• https://joel-malwarebenchmark.github.io/blog/2017/11/12/cve-2017-16763-configure-loaded-through-confire/