[electerm] Code injection in electerm

An issue was discovered in Electerm 1.3.22, allows attackers to execute arbitrary code via unverified request to electerms service.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-23256
• https://github.com/electerm/electerm/issues/1686
• https://github.com/advisories/GHSA-x73w-g8hx-v7rp