The Classics Return: Vulnerable E-Mail Scripts, (Wed, Nov 4th)
Summary
A SANS Internet Storm Center diary revisits classic web application vulnerabilities in CGI e-mail scripts, centered on CVE-2000-0411. The flaw leaked environment variables through extra URL parameters, and related bugs let attackers set the "To" address for spam or pass parameters to sendmail for possible code execution.
IFF Assessment
Old but still-instructive flaws in web scripts remain a reminder of persistent attack patterns that defenders must still guard against.
Severity
The described information disclosure is remotely exploitable over the network with low complexity and no authentication, but its impact is limited to leaking environment data. Code execution risk exists only in certain configurations, so the score sits in the medium range.
Defender Context
Legacy CGI and e-mail form scripts still appear in old or forgotten web deployments, where parameter handling flaws can leak configuration data, enable spam relay, or reach mail binaries. Defenders should inventory legacy CGI content, avoid passing user input to shell or sendmail commands, and validate parameters strictly. The piece also highlights how basic input validation failures remain a recurring theme across web vulnerabilities.