Fast Facts
- Attackers are scanning for exposed mail and test scripts, likely seeking sites to abuse for spam.
- Test scripts may accept arbitrary email recipients and disclose server configuration or environment data.
- Unsafe input passed to
sendmailcan enable command injection and potentially remote code execution.
Threat, Attack Techniques, and Targets
Scans have recently targeted web based email scripts on honeypots. The observed paths include sendmail scripts, test mail scripts, and mail configuration files. The scans do not point to one confirmed vulnerability. However, the author suspects that spammers seek forms that let them set an arbitrary “To” address.
Older flaws show the risk. Attackers could add URL parameters to expose server environment details or set the email recipient. Also, scripts that pass parameters directly to the sendmail program could allow arbitrary code execution. The word “test” in some filenames suggests attackers may seek development scripts left on live websites.
Impact, Security Implications, and Remediation
A vulnerable test script may let an attacker send email to an address of their choice and reveal server configuration details. Therefore, development artifacts can create security risks when they remain on a live website.
Remove test and development scripts before deployment. Additionally, scan your own hosts for exposed email scripts as a further check. Catch these issues during application deployment. The source does not link the current scans to a specific vulnerability.
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